Study of Channel Leakage in the Plain Reach of Zhang River
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Abstract:
The plain reach of Zhang River is a wide and shallow sandy channel. Due to being cut-off for a long time, the recharge to groundwater decreased yearly, resulting in a gradual reduction of groundwater level and therefore affecting the water transmission efficiency of Yuecheng Reservoir to downstream cities. Based on the field survey and measured data, a channel leakage model for the plain reach of Zhang River was developed, and the leakage rates under different flow rates of reservoir were determined by a two-step method, including calibration step using the observed flow data and validation step using the water level data. The results showed that the leakage area per unit reach length varies significantly, indicating the wandering characteristics of the Zhang River. Moreover, it was suggested that the total leakage increases with the increasing of flow rate of reservoir; however, the proportion of total leakage to total flow decreases and tends to be stable. A comprehensive factor was introduced in the leakage model to reflect the effects of actual conditions on leakage coefficient, and the parameterization of the unknown factors is practical.
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