Abstract
In order to improve the accuracy of the calculation of the amount of water discharge, a new integration equation method was developed and applied. In this study, field observation of runoff with a weir was carried out at the outlet of the Shangshe catchments and sub-catchments of four types of land use within the catchment in Yuexi prefecture, Anhui Province. Each weir was equipped with a float-type, water level recorder. In this research, the water level hydrograph of each rainfall–runoff event was divided into periods at 10-min intervals. In each period, a water level versus time linear function was established. Then, the water level versus flux relationship was transferred into a function between flux and time in each period, which could be integrated over time. Thus a new integral equation method was developed to calculate the amount of water discharge in sub-catchments and catchments. The result showed that the new integral equation method can improve the accuracy of annual water and sediment discharge by 8.7–17.1% at five monitoring sites using the field observation data in the year 2000. Compared to the instant flux coefficient method, it improves accuracy greatly and is suitable for the calculation of the amount of water and sediment discharge at weirs under various conditions of water level variation.
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