Analyses of River Geology and Flood Leakage Loss in the Piedmont Area of the rümqi River

In this paper,the leakage loss and output of Urabo Station during flooding of the urumqi River are estimated based on observed floods and meteorological data and river geology investigation.Process of flood and dynamics of flood waves are also investigated.Amount of urumqi River flood peak attenuation increases with flood levels,but the relative attenuation of peak flood decreases with increasing flood amount.This flood peak attenuation loss is connected with the geological structure of the piedmont belt of the river and the distribution of alluvial sand and gravel layers.When successive flood takes place in the next few days,the relative attenuation will gradually decline as later increasing in the moisture content of the underlying layers.Correlation analysis shows that power relationship can be employed to forecast river flood peak at Urabo Station.The results can be used to predict the downstream floods and provide good basis for flood control in the downstream hydraulic engineerings and cities.