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UNESCO-IHE Institute for Water Education, Delft (2008)

Hydrological analysis of the rainfall-runoff relation of the Wadis Al-Badan and Al-Far’a, West Bank

Moshe A.F.

Titre : Hydrological analysis of the rainfall-runoff relation of the Wadis Al-Badan and Al-Far’a, West Bank

Auteur : Moshe A.F.

Université de soutenance : UNESCO-IHE Institute for Water Education, Delft

Grade : Master of Science 2008

Résumé
Water is considered an essential part of life and important for the development in arid and semi-arid countries including Palestine. This study focuses on the Al-Faraand Al-Badan sub-catchments located in Palestine. Palestinians are currently denied their right water of sharing from the Jordan River. Consequently groundwater has been the major source of water in Palestine (Al Yaqoubi, 2007). Recently depletion of groundwater has become a serious problem in the region and is only becoming worse in future time. In order to improve water supply in the region, a project known by the name of Executive Action Team (EXACT) has been formulated and is currently being executed. Out of several alternatives proposed by the EXACT project, the most important one is groundwater recharge using surface water by way of employing artificial recharge methods (EXACT, 2007). The result of this study is expected to help in decision making as to which artificial recharge methods to pursue in the Al-Fara and Al-Badan sub-catchments. Moreover, this study is expected to reinforce results obtained in previous studies by resolving dissimilarities between delineations. In addition, due to the availability of longer data series than ever before, this study is expected to uniquely deliver results at a higher level of accuracy. An in-depth analysis on water balance components and rainfall-runoff relations between Al-Fara and Al-Badan to see their differences was done based on detailed measurement of long time series of hydrological and meteorological data.ARC GIS was used to delineate the sub-catchments. Data screening of long time series rainfall and runoff was made. During the data screening process, tabular comparison and visual observation were performed in order to identify suspicious data. Moreover, regression analysis techniques were used at different points as applicable. For the computation of water balance components for a three-year period with available rainfall and runoff data, actual evapotranspiration and percolation were estimated with the Root Zone Model. The NAM and Wageningen models were tested if they could be used for peak flow prediction and the simulation of the rainfall-runoff relation. Finally, an attempt was made to relate discharges from springs and water levels in observation wells with rainfall and runoff data to determine the factors that affect the base flow.ARC GIS delineation showed that the Al-Badan and Al-Fara sub-catchments comprise areas of about 85 km2 and 60 km2, respectively. The two sub-catchments have different hydrologic parameters based on analysis of long and short time series. Al-Fara sub-catchments computed runoff coefficients were lower for both individual rainfall-runoff events as on an annual basis, i.e., 0.7 % and 10.0 % than those of Al-Badan with 6.4 % and 21.6 %, respectively. Furthermore it was found that the deep percolation and actual evapotranspiration amounts are higher for Al-Fara than that for Al-Badan. Comparing the two sub-catchments, it was found that they have a significant difference in the values of some water balance components. It was found that the Al-Badan sub-catchment runoff coefficient is nine times larger for an event and two times for an hydrological year than observed for the Al-Fara sub-catchment.

Mots clés : rainfall-runoff ; water balance ; water levels ; hydrological analysis ; West Bank

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Page publiée le 25 décembre 2014, mise à jour le 17 octobre 2018