TY  - JOUR
A1  - de Araujo, Jose Carlos
A1  - Bronstert, Axel
T1  - A method to assess hydrological drought in semi-arid environments and its application to the Jaguaribe River basin, Brazil
JF  - Water International
N2  - This manuscript proposes a method to assess hydrological drought in semi-arid environments under high impoundment rate and applies it to the semi-arid Jaguaribe River basin in Brazil. It analyzes droughts (1) in the largest reservoir systems; (2) in the Upper Basin, considering 4744 reservoirs, 800 wells and almost 18,000 cisterns; and (3) in reservoirs of different sizes during multiyear droughts. Results show that the water demand is constrained in the basin; hydrological and meteorological droughts are often out of phase; there is a negative correlation between storage level and drought severity; and the small systems cannot cope with long-term droughts.
KW  - Reservoirs
KW  - Brazil
KW  - multiyear drought
KW  - water management
KW  - impoundment rate
KW  - water demand
Y1  - 2016
U6  - https://doi.org/10.1080/02508060.2015.1113077
SN  - 0250-8060
SN  - 1941-1707
VL  - 41
SP  - 213
EP  - 230
PB  - Wiley-Blackwell
CY  - Abingdon
ER  - 
TY  - JOUR
A1  - Medeiros, Pedro Henrique Augusto
A1  - de Araujo, Jose Carlos
A1  - Mamede, George Leite
A1  - Creutzfeldt, Benjamin
A1  - Guentner, Andreas
A1  - Bronstert, Axel
T1  - Connectivity of sediment transport in a semiarid environment: a synthesis for the Upper Jaguaribe Basin, Brazil
JF  - Journal of soils and sediments : protection, risk assessment and remediation
N2  - Hydrosedimentological studies conducted in the semiarid Upper Jaguaribe Basin, Brazil, enabled the identification of the key processes controlling sediment connectivity at different spatial scales (10(0)-10(4) km(2)).
 Water and sediment fluxes were assessed from discharge, sediment concentrations and reservoir siltation measurements. Additionally, mathematical modelling (WASA-SED model) was used to quantify water and sediment transfer within the watershed.
 Rainfall erosivity in the study area was moderate (4600 MJ mm ha(-1) h(-1) year(-1)), whereas runoff depths (16-60 mm year(-1)), and therefore the sediment transport capacity, were low. Consequently, similar to 60 % of the eroded sediment was deposited along the landscape, regardless of the spatial scale. The existing high-density reservoir network (contributing area of 6 km(2) per reservoir) also limits sediment propagation, retaining up to 47 % of the sediment at the large basin scale. The sediment delivery ratio (SDR) decreased with the spatial scale; on average, 41 % of the eroded sediment was yielded from the hillslopes, while for the whole 24,600-km(2) basin, the SDR was reduced to 1 % downstream of a large reservoir (1940-hm(3) capacity).
 Hydrological behaviour in the Upper Jaguaribe Basin represents a constraint on sediment propagation; low runoff depth is the main feature breaking sediment connectivity, which limits sediment transference from the hillslopes to the drainage system. Surface reservoirs are also important barriers, but their relative importance to sediment retention increases with scale, since larger contributing areas are more suitable for the construction of dams due to higher hydrological potential.
KW  - Brazil
KW  - Connectivity
KW  - Sediment redistribution
KW  - Semiarid
KW  - Spatial scale
Y1  - 2014
U6  - https://doi.org/10.1007/s11368-014-0988-z
SN  - 1439-0108
SN  - 1614-7480
VL  - 14
IS  - 12
SP  - 1938
EP  - 1948
PB  - Springer
CY  - Heidelberg
ER  -