TY  - JOUR
A1  - De Araujo, Josè Carlos
A1  - Güntner, Andreas
A1  - Bronstert, Axel
T1  - Loss of reservoir volume by sediment deposition and its impact on water availability in semiarid Brazil
N2  - A methodology is presented to assess the impact of reservoir silting oil water availability for semiarid environments, applied to seven representative watersheds in the state of Ceara, Brazil. Water yield is computed using stochastic modelling for several reliability levels and water yield reduction is quantified for the focus areas. The yield-volume elasticity concept, which indicates the relative yield reduction in terms of relative storage capacity of the reservoirs, is presented and applied. Results chow that storage capacity was reduced by 0.2% year(-1) due to silting, that the risk of water shortage almost doubled in less than 50 years for the most critical reservoir, and that reduction of storage capacity had three times more impact oil yield reduction than the increase in evaporation. Average 90% reliable yield-volume elasticity was 0.8, which means that the global water yield (Q(90)) in Ceara is expected to diminish yearly by 388 L s(-1) due to reservoir silting
Y1  - 2006
UR  - http://www.atypon-link.com/IAHS/loi/hysj
U6  - https://doi.org/10.1623/hysj.51.1.157
SN  - 0262-6667
ER  - 
TY  - JOUR
A1  - Krol, Maarten
A1  - Jaeger, Annekathrin
A1  - Bronstert, Axel
A1  - Güntner, Andreas
T1  - Integrated modelling of climate, water, soil, agricultural and socio-economic processes: A general introduction of the methodology and some exemplary results from the semi-arid north-east of Brazil
JF  - Journal of hydrology
N2  - Many semi-arid regions are characterised by water scarcity and vulnerability of natural resources, pronounced climatic variability and social stress. Integrated studies including climatotogy, hydrology, and socio-econornic studies are required both for analysing the dynamic natural conditions and to assess possible strategies to make semi-arid regions Less vulnerable to the present and changing climate. The model introduced here dynamically describes the retationships between climate forcing, water availability, agriculture and selected societal processes. The model has been tailored to simulate the rather complex situation in the semi-and north-eastern Brazil in a quantitative manner including the sensitivity to external forcing, such as climate change. The selected results presented show the general functioning of the integrated model, with a primary focus on climate change impacts. It becomes evident that due to Large differences in regional climate scenarios, it is still impossible to give quantitative values for the most probable development, e.g., to assign probabilities to the simulated results. However, it becomes clear that water is a very crucial factor, and that an efficient and ecologically sound water management is a key question for the further development of that semi-arid region. The simulation results show that, independent of the differences in climate change scenarios, rain-fed farming is more vulnerable to drought impacts compared to irrigated farming. However, the capacity of irrigation and other water infrastructure systems to enhance resilience in respect to climatic fluctuations is significantly constrained given a significant negative precipitation trend. (c) 2005 Elsevier B.V. All rights reserved.
KW  - integrated modelling
KW  - integrated river basin management
KW  - water resources management
KW  - semi-arid hydrology
KW  - climate change
Y1  - 2006
U6  - https://doi.org/10.1016/j.jhydrol.2005.12.021
SN  - 0022-1694
VL  - 328
IS  - 3-4
SP  - 417
EP  - 431
PB  - Elsevier
CY  - Amsterdam
ER  -