Simulation sediment hydrograph at Fayda and Al-Baqaq wadis in North Iraq using a watershed modelling system

摘要

Sediment yield estimation in the watershed areas of rivers and water surface bodies is considered an important subject in the design of hydraulics and sediment models for control canals against floods, sediment estimation in reservoirs and navigation canals. Fayda and Al-Baqaq wadis were selected as a case study on the eastern bank of Mosul Dam lake to estimate the average sediment yield resulting from the erosion processes in the watershed area of these valleys during rainfall, and to predict a unit flowing sediment hydrograph in these valleys. The study included a computer-based topographical and morphological simulation using a watershed modelling system feeding this model with various hydrographical and physiological data concerning the study area. A common world approach was used to estimate the sediment yield in drainage basins. Empirical relations to estimate runoff coefficient and peak discharges in addition to sediment yield related to peak discharge are predicted. A non-dimensional sediment hydrograph is used to calculate the sediment yield for any rainstorm in the Fayda and Al-Baqaq wadis. This is a useful tool for evaluating the future influence of these sediment quantities on Mosul Dam Lake.