Analysis of River System Structure and Runoff Evolution of Typical Section in Ziya River Plain

Abstract

In this study, by interpretation method, the density, quantity, length and variation of rivers in Ziya River Plainincreased in the 1960s and 1980s, mainly related to the excavation of small tributaries and canals. By comparing the series of years before and after 1980, the amount of surface water resources in the study area has decreased in the past 30 years. By using cumulative anomaly method and Kendall trend test method, it is found that the annual average runoff of typical cross-section decreases obviously, and the time series sudden change occurs in the late 1970s. The situation of the trunk runoff cut-off and drying-up caused by the river system structure and runoff evolution is evaluated, and the interannual evolution of the eco-hydrological system in Ziya River Plain is obtained.These can provide scientific support for water environment research and water ecological restoration in plain areas.