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Abstract

S tream flow is always changing, from day to day and even minute to minute. Precipitation and temperature are the main influence on changing streamflow in the watershed. The world is changing at a significant rate in terms of climate change and this change can affect the water resources. Therefore, awareness about this changing has driven efforts to local water resources for improved insight into water resources infrastructure and management. This paper presents the spatio-temporal characterization of current and future available quantities of water for irrigation based on climate change regarding the three basins namely: Ou Sya, Ou Kontrom and Peam Pul located in Kompong Speu flowing into Mekong River Basin. To determine variation of flow in these three basins, Soil and Water Assessment Model (SWAT) was applied in this study. The model has been run for a period of 18 years from 1997-2007 for baseline. Most rainfall stations employed in this study were chosen surrounding catchment and using MQUAD method for creating average rainfall for each subbasin. The result of calibrated flow meets satisfactory agreement with the observed data. For scenario, 24 hypothetical climate change scenarios were used to cover the possible ranges of ariability from 1980-2080 for global model. Then, after downscaling to Cambodian regional, two model such as CNRM_CM3 and GISS_AOM Models were selected. It is then watershed downscaling was done to get the best model for this watershed, CNRM_CM3 was obtain. When this model scenario was incorporated into SWAT model, the future conditions in the three basins above were postulated. The results demonstrated that the three basins would experience an increase flow-out under climate change. These results are relevant to planners; they can be useful in formulating realistic watershed management policies for providing sufficient Water Consumption for irrigation in those three basins.

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