56879
2020
2020
eng
12
23
47
article
American Geophysical Union
Washington
1
2020-11-23
2020-11-23
--
Annually resolved monsoon onset and withdrawal dates across the Himalayas derived from local precipitation statistics
A local and flexible definition of the monsoon season based on hydrological evidence is important for the understanding and management of Himalayan water resources. Here, we present an objective statistical method to retrieve seasonal hydrometeorological transitions. Applied to daily rainfall data (1951-2015), this method shows an average longitudinal delay of similar to 15 days, with later monsoon onset and earlier withdrawal in the western Himalaya, consistent with the continental progression of wet air masses. This delay leads to seasons of different length along the Himalaya and biased precipitation amounts when using uniform calendric monsoon boundaries. In the Central Himalaya annual precipitation has increased, due primarily to an increase of premonsoon precipitation. These findings highlight issues associated with a static definition of monsoon boundaries and call for a deeper understanding of nonmonsoonal precipitation over the Himalayan water tower. <br /> Plain Language Summary Precipitation in the Himalayas determines water availability for the Indian foreland with large socioeconomic implications. Despite its importance, spatial and temporal patterns of precipitation are poorly understood. Here, we estimate the long-term average and trends of seasonal precipitation at the scale of individual catchments draining the Himalayas. We apply a statistical method to detect the timing of hydrometeorological seasons from local precipitation measurements, focusing on monsoon onset and withdrawal. We identify longitudinal and latitudinal delays, resulting in seasons of different length along and across the Himalayas. These spatial patterns and the annual variability of the monsoon boundaries mean that oft-used, fixed calendric dates, for example, 1 June to 30 September, may be inadequate for retrieving monsoon rainfall totals. Moreover, we find that, despite its prominent contribution to annual rainfall totals, the Indian summer monsoon cannot explain the increase of the annual precipitation over the Central Himalayas. Instead, this appears to be mostly driven by changes in premonsoon and winter rainfall. So far, little attention has been paid to premonsoon precipitation, but governed by evaporative processes and surface water availability, it may be enhanced by irrigation and changed land use in the Gangetic foreland.
Geophysical research letters
10.1029/2020GL088420
0094-8276
1944-8007
outputup:dataSource:WoS:2020
e2020GL088420
WOS:000598677000074
Brunello, CF (corresponding author), German Res Ctr Geosci, Helmholtz Ctr Potsdam, Potsdam, Germany.; Brunello, CF (corresponding author), Free Univ Bozen Bolzano, Fac Sci & Technol, Bozen Bolzano, Italy., camilla.brunello@gfz-potsdam.de
Brunello, Camilla Francesca
2022-11-29T10:04:17+00:00
sword
importub
filename=package.tar
61da0e3fa7067727fb41775380042500
2021599-X
7403-2
false
true
CC-BY-NC - Namensnennung, nicht kommerziell 4.0 International
Camilla Francesca Brunello
Christoff Andermann
Odin Marc
Katharina A. Schneider
Francesco Comiti
Stefan Achleitner
Niels Hovius
Geowissenschaften
Institut für Geowissenschaften
Referiert
Import
Hybrid Open-Access
61001
2020
2020
eng
159
176
18
286
article
Elsevier
New York [u.a.]
1
2020-07-11
2020-07-11
--
Variations in organic carbon sourcing along a trans-Himalayan river determined by a Bayesian mixing approach
Rivers transfer particulate organic carbon (POC) from eroding mountains into geological sinks. Organic carbon source composition and selective mobilization have been shown to affect the type and quantity of POC export, but their combined effects across complex mountain ranges remain underexplored. Here, we examine the variation in organic carbon sourcing and transport in the trans-Himalayan Kali Gandaki River catchment, along strong gradients in precipitation, rock type and vegetation. Combining bulk stable nitrogen, and stable and radioactive organic carbon isotopic composition of bedrock, litter, soil and river sediment samples with a Bayesian end-member mixing approach, we differentiate POC sources along the river and quantify their export. Our analysis shows that POC export from the Tibetan segment of the catchment, where carbon bearing shales are partially covered by aged and modern soils, is dominated by petrogenic POC. Based on our data we re-assess the presence of aged biospheric OC in this part of the catchment, and its contribution to the river load. In the High Himalayan segment, we observed low inputs of petrogenic and biospheric POC, likely due to very low organic carbon concentrations in the metamorphic bedrock, combined with erosion dominated by deep-seated landslides. Our findings show that along the Kali Gandaki River, the sourcing of sediment and organic carbon are decoupled, due to differences in rock organic carbon content, soil and above ground carbon stocks, and geomorphic process activity. While the fast eroding High Himalayas are the principal source of river sediment, the Tibetan headwaters, where erosion rates are lower, are the principal source of organic carbon. To robustly estimate organic carbon export from the Himalayas, the mountain range should be divided into tectono-physiographic zones with distinct organic carbon yields due to differences in substrate and erosion processes and rates.
Geochimica et cosmochimica acta : journal of the Geochemical Society and the Meteoritical Society
10.1016/j.gca.2020.07.003
0016-7037
outputup:dataSource:WoS:2020
WOS:000561935200009
Menges, J (corresponding author), GFZ German Res Ctr Geosci, D-14473 Potsdam, Germany., menges@gfz-potsdam.de
Helmholtz Impuls und Vernetzungs Fond
Menges, Johanna
2023-10-05T05:51:46+00:00
sword
importub
filename=package.tar
5177386583e14f77937d1f57ebb58142
1483679-8
300305-X
false
true
Johanna Menges
Niels Hovius
Christoff Andermann
Maarten Lupker
Negar Haghipour
Lena Märki
Dirk Sachse
eng
uncontrolled
particulate organic carbon
eng
uncontrolled
Himalaya
eng
uncontrolled
rivers
eng
uncontrolled
carbon cycle
eng
uncontrolled
stable
eng
uncontrolled
isotopes
eng
uncontrolled
erosion
eng
uncontrolled
end-member mixing
Geowissenschaften
Institut für Geowissenschaften
Referiert
Import
47631
2019
2019
eng
13814
13824
11
23
46
article
American Geophysical Union
Washington
1
2019-12-03
--
--
Late holocene landscape collapse of a trans-himalayan dryland
Soil degradation is a severe and growing threat to ecosystem services globally. Soil loss is often nonlinear, involving a rapid deterioration from a stable eco-geomorphic state once a tipping point is reached. Soil loss thresholds have been studied at plot scale, but for landscapes, quantitative constraints on the necessary and sufficient conditions for tipping points are rare. Here, we document a landscape-wide eco-geomorphic tipping point at the edge of the Tibetan Plateau and quantify its drivers and erosional consequences. We show that in the upper Kali Gandaki valley, Nepal, soil formation prevailed under wetter conditions during much of the Holocene. Our data suggest that after a period of human pressure and declining vegetation cover, a 20% reduction of relative humidity and precipitation below 200 mm/year halted soil formation after 1.6 ka and promoted widespread gullying and rapid soil loss, with irreversible consequences for ecosystem services.
Geophysical research letters
human impact and aridification
10.1029/2019GL084192
0094-8276
1944-8007
wos:2019
WOS:000502284000001
Menges, J (reprint author), GFZ German Res Ctr Geosci, Sect 4 6, Potsdam, Germany., menges@gfz-potsdam.de
Helmholtz Impuls und Vernetzungs Fond
importub
2020-09-14T17:05:45+00:00
filename=package.tar
74673deb3806e9af5fd79864a6e253b2
false
true
Johanna Menges
Niels Hovius
Christoff Andermann
Michael Dietze
Charlie Swoboda
Kristen L. Cook
Basanta R. Adhikari
Andrea Vieth-Hillebrand
Stephane Bonnet
Tony Reimann
Andreas Koutsodendris
Dirk Sachse
eng
uncontrolled
geomorphology
eng
uncontrolled
paleoclimate
eng
uncontrolled
human activity
eng
uncontrolled
Tibetan plateau
eng
uncontrolled
late Holocene
Geowissenschaften
Institut für Geowissenschaften
Referiert
Open Access
Import
Hybrid Open-Access
48803
2019
2019
eng
148
159
12
518
article
Elsevier
Amsterdam
1
2019-05-15
2019-09-15
--
Hydroclimatic seasonality recorded by tree ring delta O-18 signature across a Himalayan altitudinal transect
Water stable isotope ratios of tropical precipitation predominantly reflect moisture source and precipitation intensity. Trees can incorporate the isotopic signals into annual tree-ring cellulose records, permitting reconstruction of the temporal changes of hydroclimate over decades to millennia. This is especially valuable in the Himalayas where the understanding of monsoon dynamics is limited by the lack of a dense and representative observational network. We have analyzed tree ring delta O-18 records from two distinct physiographic sites along the upper Kali Gandaki valley in the central Nepal Himalayas, representing the wet High-Himalayas and the Trans-Himalayan dryland to the north. Empirical correlations and regression analyses were compared to an in-situ calibrated oxygen isotope fractionation model, exploring the relationships between tree ring delta O-18 and seasonal-mean variability of hydroclimatic forcing at the different locations. For this purpose, gridded precipitation data from the Asian rain gauge dataset APHRODITE, as well as high resolution onsite observations (relative humidity, air temperature, delta O-18 of precipitation and radial tree growth) were used. We found that two distinct sets of meteorological values, reflecting pre-monsoon and monsoon conditions, are needed to reproduce the measured tree ring delta O-18 values from the High-Himalayan site, but that a single set of monsoonal values performs best for the Trans-Himalayan site. We conclude that Trans-Himalayan trees capture long-term changes in strength of the Indian summer monsoon. In contrast, High-Himalayan tree ring delta(18)Orecords a more complex hydro-climatic signal reflecting both pre-monsoon and monsoon seasons with very contrasting isotopic signatures of precipitation. This difference in the two hydroclimatic proxy records offers an opportunity to reconstruct first-order hydroclimate conditions, such as local precipitation rates, and to gain new insights into monsoon timing and seasonal water source determination across the Himalayan orographic region. (C) 2019 Elsevier B.V. All rights reserved.
Earth & planetary science letters
10.1016/j.epsl.2019.04.030
0012-821X
1385-013X
wos:2019
WOS:000471206200014
Brunello, CF (reprint author), GFZ German Res Ctr Geosci, D-14473 Potsdam, Germany., niels.hovius@uni-potsdam.de
Free University of Bozen Bolzano; German Research Center for Geoscience - GFZ Potsdam; German Helmholtz AssociationHelmholtz Association [PD-039]
2021-01-06T14:11:57+00:00
sword
importub
filename=package.tar
d951ad22a8cfd11bd5e78a8bac9e3141
false
true
Camilla Francesca Brunello
Christoff Andermann
Gerhard Helle
Francesco Comiti
Giustino Tonon
Achyut Tiwari
Niels Hovius
eng
uncontrolled
Himalayan hydroclimate
eng
uncontrolled
seasonal precipitation
eng
uncontrolled
pre-monsoon
eng
uncontrolled
monsoon onset
eng
uncontrolled
oxygen fractionation model
eng
uncontrolled
dendroclimatology
Geowissenschaften
Institut für Geowissenschaften
Referiert
Import
50415
2019
2019
eng
107
128
22
1
7
article
Copernicus
Göttingen
1
--
2019-01-25
--
Long-term erosion of the Nepal Himalayas by bedrock landsliding
In active mountain belts with steep terrain, bedrock landsliding is a major erosional agent. In the Himalayas, landsliding is driven by annual hydro-meteorological forcing due to the summer monsoon and by rarer, exceptional events, such as earthquakes. Independent methods yield erosion rate estimates that appear to increase with sampling time, suggesting that rare, high-magnitude erosion events dominate the erosional budget. Nevertheless, until now, neither the contribution of monsoon and earthquakes to landslide erosion nor the proportion of erosion due to rare, giant landslides have been quantified in the Himalayas. We address these challenges by combining and analysing earthquake- and monsoon-induced landslide inventories across different timescales. With time series of 5 m satellite images over four main valleys in central Nepal, we comprehensively mapped landslides caused by the monsoon from 2010 to 2018. We found no clear correlation between monsoon properties and landsliding and a similar mean landsliding rate for all valleys, except in 2015, where the valleys affected by the earthquake featured similar to 5-8 times more landsliding than the pre-earthquake mean rate. The longterm size-frequency distribution of monsoon-induced landsliding (MIL) was derived from these inventories and from an inventory of landslides larger than similar to 0.1 km(2) that occurred between 1972 and 2014. Using a published landslide inventory for the Gorkha 2015 earthquake, we derive the size-frequency distribution for earthquakeinduced landsliding (EQIL). These two distributions are dominated by infrequent, large and giant landslides but under-predict an estimated Holocene frequency of giant landslides (> 1 km(3)) which we derived from a literature compilation. This discrepancy can be resolved when modelling the effect of a full distribution of earthquakes of variable magnitude and when considering that a shallower earthquake may cause larger landslides. In this case, EQIL and MIL contribute about equally to a total long-term erosion of similar to 2 +/- 0.75 mm yr(-1) in agreement with most thermo-chronological data. Independently of the specific total and relative erosion rates, the heavy-tailed size-frequency distribution from MIL and EQIL and the very large maximal landslide size in the Himalayas indicate that mean landslide erosion rates increase with sampling time, as has been observed for independent erosion estimates. Further, we find that the sampling timescale required to adequately capture the frequency of the largest landslides, which is necessary for deriving long-term mean erosion rates, is often much longer than the averaging time of cosmogenic Be-10 methods. This observation presents a strong caveat when interpreting spatial or temporal variability in erosion rates from this method. Thus, in areas where a very large, rare landslide contributes heavily to long-term erosion (as the Himalayas), we recommend Be-10 sample in catchments with source areas > 10 000 km(2) to reduce the method mean bias to below similar to 20 % of the long-term erosion.
Earth surface dynamics
the role of monsoons, earthquakes and giant landslides
10.5194/esurf-7-107-2019
2196-6311
2196-632X
wos:2019
WOS:000456811800001
Marc, O (reprint author), Univ Strasbourg, Ecole & Observ Sci Terre, Inst Phys Globe Strasbourg, CNRS UMR 7516, F-67084 Strasbourg, France., odin.marc@unistra.fr
GFZ-Potsdam HART (Hazard and Risk Team); French Space Agency (CNES) through the project STREAM-LINE GLIDERS "SaTellite-based Rainfall Measurement and LandslIde detectioN for Global LandslIDE-Rainfall Scaling"; German Federal Ministry of Education and Research through the project SaWaM (Seasonnal Water Management for Semiarid Areas) [02WGR1421]; German Federal Ministry of Economy; RESA [00165]
2021-04-20T07:22:17+00:00
sword
importub
filename=package.tar
4f3ca4831bc81a0ecdb014943f2f7306
<a href="https://doi.org/10.25932/publishup-42502">Zweitveröffentlichung in der Schriftenreihe Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe; 646</a>
Marc, Odin
false
true
CC-BY - Namensnennung 4.0 International
Odin Marc
Robert Behling
Christoff Andermann
Jens M. Turowski
Luc Illien
Sigrid Roessner
Niels Hovius
Geowissenschaften
Institut für Geowissenschaften
Referiert
Import
Gold Open-Access
DOAJ gelistet
42502
2019
2019
eng
22
646
postprint
1
2019-02-22
2019-02-22
--
Long-term erosion of the Nepal Himalayas by bedrock landsliding
In active mountain belts with steep terrain, bedrock landsliding is a major erosional agent. In the Himalayas, landsliding is driven by annual hydro-meteorological forcing due to the summer monsoon and by rarer, exceptional events, such as earthquakes. Independent methods yield erosion rate estimates that appear to increase with sampling time, suggesting that rare, high-magnitude erosion events dominate the erosional budget. Nevertheless, until now, neither the contribution of monsoon and earthquakes to landslide erosion nor the proportion of erosion due to rare, giant landslides have been quantified in the Himalayas. We address these challenges by combining and analysing earthquake- and monsoon-induced landslide inventories across different timescales. With time series of 5 m satellite images over four main valleys in central Nepal, we comprehensively mapped landslides caused by the monsoon from 2010 to 2018. We found no clear correlation between monsoon properties and landsliding and a similar mean landsliding rate for all valleys, except in 2015, where the valleys
affected by the earthquake featured ∼ 5–8 times more landsliding than the pre-earthquake mean rate. The longterm size–frequency distribution of monsoon-induced landsliding (MIL) was derived from these inventories and from an inventory of landslides larger than ∼ 0.1 km 2 that occurred between 1972 and 2014. Using a published landslide inventory for the Gorkha 2015 earthquake, we derive the size–frequency distribution for earthquake-induced landsliding (EQIL). These two distributions are dominated by infrequent, large and giant landslides but under-predict an estimated Holocene frequency of giant landslides (> 1 km 3 ) which we derived from a literature compilation. This discrepancy can be resolved when modelling the effect of a full distribution of earthquakes of variable magnitude and when considering that a shallower earthquake may cause larger landslides. In this case, EQIL and MIL contribute about equally to a total long-term erosion of ∼ 2 ± 0.75 mm yr −1 in agreement with most thermo-chronological data. Independently of the specific total and relative erosion rates, the heavy-tailed size–frequency distribution from MIL and EQIL and the very large maximal landslide size in the Himalayas indicate that mean landslide erosion rates increase with sampling time, as has been observed for independent erosion estimates. Further, we find that the sampling timescale required to adequately capture the frequency of the largest landslides, which is necessary for deriving long-term mean erosion rates, is often much longer than the averaging time of cosmogenic 10 Be methods. This observation presents a strong caveat when interpreting spatial or temporal variability in erosion rates from this method. Thus, in areas where a very large, rare landslide contributes heavily to long-term erosion (as the Himalayas), we recommend 10 Be sample in catchments with source areas > 10 000 km 2 to reduce the method mean bias to below ∼ 20 % of the long-term erosion.
Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
the role of monsoons, earthquakes and giant landslides
10.25932/publishup-42502
urn:nbn:de:kobv:517-opus4-425022
1866-8372
online registration
Earth Surface Dynamics 7 (2019), pp. 107–128 DOI 10.5194/esurf-7-107-2019
<a href="http://publishup.uni-potsdam.de/50415">Bibliographieeintrag der Originalveröffentlichung/Quelle</a>
CC-BY - Namensnennung 4.0 International
Odin Marc
Robert Behling
Christoff Andermann
Jens M. Turowski
Luc Illien
Sigrid Roessner
Niels Hovius
Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe
646
eng
uncontrolled
rainfall thresholds
eng
uncontrolled
global database
eng
uncontrolled
sediment flux
eng
uncontrolled
mountain belt
eng
uncontrolled
rates
eng
uncontrolled
river
eng
uncontrolled
size
eng
uncontrolled
exhumation
eng
uncontrolled
precipitation
eng
uncontrolled
inventories
Geowissenschaften
open_access
Mathematisch-Naturwissenschaftliche Fakultät
Referiert
Open Access
Universität Potsdam
https://publishup.uni-potsdam.de/files/42502/pmnr646.pdf
51716
2018
2018
eng
53
57
5
6410
362
article
American Assoc. for the Advancement of Science
Washington
1
--
2018-10-05
--
Glacial lake outburst floods as drivers of fluvial erosion in the Himalaya
Himalayan rivers are frequently hit by catastrophic floods that are caused by the failure of glacial lake and landslide dams; however, the dynamics and long-term impacts of such floods remain poorly understood. We present a comprehensive set of observations that capture the July 2016 glacial lake outburst flood (GLOF) in the Bhotekoshi/Sunkoshi River of Nepal. Seismic records of the flood provide new insights into GLOF mechanics and their ability to mobilize large boulders that otherwise prevent channel erosion. Because of this boulder mobilization, GLOF impacts far exceed those of the annual summer monsoon, and GLOFs may dominate fluvial erosion and channel-hillslope coupling many tens of kilometers downstream of glaciated areas. Long-term valley evolution in these regions may therefore be driven by GLOF frequency and magnitude, rather than by precipitation.
Science
10.1126/science.aat4981
30287655
0036-8075
1095-9203
wos:2018
WOS:000446547100039
Cook, KL (reprint author), GFZ German Res Ctr Geosci, Potsdam, Germany., klcook@gfz-potsdam.de
GFZ HART grant; Helmholtz Postdoc fellowship; ANRFrench National Research Agency (ANR) [17-CE01-0008-01]
2021-09-13T10:59:42+00:00
sword
importub
filename=package.tar
4c290e1a6366a67892d3e3a461f833e3
Cook, Kirsten L.
false
true
Kristen L. Cook
Christoff Andermann
Florent Gimbert
Basanta Raj Adhikari
Niels Hovius
Geowissenschaften
Institut für Geowissenschaften
Referiert
Import
Bronze Open-Access
50794
2018
2018
eng
331
341
11
1
44
article
Wiley
Hoboken
1
--
2018-09-21
--
Protracted river response to medieval earthquakes
Mountain rivers respond to strong earthquakes by rapidly aggrading to accommodate excess sediment delivered by co-seismic landslides. Detailed sediment budgets indicate that rivers need several years to decades to recover from seismic disturbances, depending on how recovery is defined. We examine three principal proxies of river recovery after earthquake-induced sediment pulses around Pokhara, Nepal's second largest city. Freshly exhumed cohorts of floodplain trees in growth position indicate rapid and pulsed sedimentation that formed a fan covering 150 km2 in a Lesser Himalayan basin with tens of metres of debris between the 11th and 15th centuries AD. Radiocarbon dates of buried trees are consistent with those of nearby valley deposits linked to major medieval earthquakes, such that we can estimate average rates of re-incision since. We combine high-resolution digital elevation data, geodetic field surveys, aerial photos, and dated tree trunks to reconstruct geomorphic marker surfaces. The volumes of sediment relative to these surfaces require average net sediment yields of up to 4200 t km–2 yr–1 for the 650 years since the last inferred earthquake-triggered sediment pulse. The lithological composition of channel bedload differs from that of local bedrock, confirming that rivers are still mostly evacuating medieval valley fills, locally incising at rates of up to 0.2 m yr–1. Pronounced knickpoints and epigenetic gorges at tributary junctions further illustrate the protracted fluvial response; only the distal portions of the earthquake-derived sediment wedges have been cut to near their base. Our results challenge the notion that mountain rivers recover speedily from earthquakes within years to decades. The valley fills around Pokhara show that even highly erosive Himalayan rivers may need more than several centuries to adjust to catastrophic perturbations. Our results motivate some rethinking of post-seismic hazard appraisals and infrastructural planning in active mountain regions.
Earth surface processes and landforms : the journal of the British Geomorphological Research Group
10.1002/esp.4517
0197-9337
1096-9837
wos:2019
WOS:000456214900024
Stolle, A (reprint author), Univ Potsdam, Inst Earth & Environm Sci, Potsdam, Germany., amelie.stolle@uni-potsdam.de
German Research Foundation (DFG)German Research Foundation (DFG) [KO 3937/9-1]; DFG Graduate School, Natural Hazards and Risks in a Changing World (NatRiskChange); German Aerospace Center (DLR)Helmholtz AssociationGerman Aerospace Centre (DLR) [DEM_GEOL1053]; BRAIN-Marie Sklodowska-Curie fellowship at the University of Potsdam
2021-05-25T12:23:26+00:00
sword
importub
filename=package.tar
0d29734e821bd8726347e113d19096ac
false
true
Amelie Stolle
Wolfgang Schwanghart
Christoff Andermann
Anne Bernhardt
Monique Fort
John D. Jansen
Hella Wittmann
Silke Merchel
Georg Rugel
Basanta Raj Adhikari
Oliver Korup
eng
uncontrolled
fluvial response
eng
uncontrolled
sediment yield
eng
uncontrolled
earthquakes
eng
uncontrolled
Nepal
eng
uncontrolled
Himalaya
Geowissenschaften
Institut für Geowissenschaften
Referiert
Import
Bronze Open-Access
45695
2016
2016
eng
147
150
4
351
article
American Assoc. for the Advancement of Science
Washington
1
--
--
--
Repeated catastrophic valley infill following medieval earthquakes in the Nepal Himalaya
Geomorphic footprints of past large Himalayan earthquakes are elusive, although they are urgently needed for gauging and predicting recovery times of seismically perturbed mountain landscapes. We present evidence of catastrophic valley infill following at least three medieval earthquakes in the Nepal Himalaya. Radiocarbon dates from peat beds, plant macrofossils, and humic silts in fine-grained tributary sediments near Pokhara, Nepal’s second-largest city, match the timing of nearby M > 8 earthquakes in ~1100, 1255, and 1344 C.E. The upstream dip of tributary valley fills and x-ray fluorescence spectrometry of their provenance rule out local sources. Instead, geomorphic and sedimentary evidence is consistent with catastrophic fluvial aggradation and debris flows that had plugged several tributaries with tens of meters of calcareous sediment from a Higher Himalayan source >60 kilometers away.
Science
10.1126/science.aac9865
26676354
0036-8075
1095-9203
wos2016:2019
WOS:000367806500035
Schwanghart, W (reprint author), Univ Potsdam, Inst Earth & Environm Sci, Potsdam, Germany., w.schwanghart@geo.uni-potsdam.de
German Research Foundation [KO 3937/9]; Potsdam Research Cluster for Georisk Analysis (PROGRESS); Helmholtz Postdoc Program of the German Helmholtz Association [PD-039]
importub
2020-03-22T20:41:01+00:00
filename=package.tar
ed99873cebe8da1a1f129483307ad45b
Wolfgang Schwanghart
Anne Bernhardt
Amelie Stolle
Philipp Hoelzmann
Basanta R. Adhikari
Christoff Andermann
Stefanie Tofelde
Silke Merchel
Georg Rugel
Monique Fort
Oliver Korup
Institut für Geowissenschaften
Referiert
Institut für Erd- und Umweltwissenschaften
Import
38998
2015
2015
eng
2302
2308
7
7
42
article
American Geophysical Union
Washington
1
--
--
--
Monsoonal hillslope processes determine grain size-specific suspended sediment fluxes in a trans-Himalayan river
Sediments in rivers record the dynamics of erosion processes. While bulk sediment fluxes are easily and routinely obtained, sediment caliber remains underexplored when inferring erosion mechanisms. Yet sediment grain size distributions may be the key to discriminating their origin. We have studied grain size-specific suspended sediment fluxes in the Kali Gandaki, a major trans-Himalayan river. Two strategically located gauging stations enable tracing of sediment caliber on either side of the Himalayan orographic barrier. The data show that fine sediment input into the northern headwaters is persistent, while coarse sediment comes from the High Himalayas during the summer monsoon. A temporally matching landslide inventory similarly indicates the prominence of monsoon-driven hillslope mass wasting. Thus, mechanisms of sediment supply can leave strong traces in the fluvial caliber, which could project well beyond the mountain front and add to the variability of the sedimentary record of orogen erosion.
Geophysical research letters
10.1002/2015GL063360
0094-8276
1944-8007
wos:2015
WOS:000353988700030
Andermann, C (reprint author), GFZ German Res Ctr Geosci, Potsdam, Germany., christoff.andermann@gfz-potsdam.de
Potsdam Research Cluster for Georisk Analysis, Environmental Change and
Sustainability (PROGRESS); German Academic Exchange Service; German
Helmholtz Association [PD-039]
Martin Struck
Christoff Andermann
Niels Hovius
Oliver Korup
Jens M. Turowski
Raj Bista
Hari P. Pandit
Ranjan K. Dahal
eng
uncontrolled
Himalayas
eng
uncontrolled
erosion
eng
uncontrolled
grain size
eng
uncontrolled
suspended sediments
eng
uncontrolled
landslide
eng
uncontrolled
river transport
Institut für Geowissenschaften
Referiert
Institut für Erd- und Umweltwissenschaften