Characteristics of flow and sediment of Bahe basin in recent 50 years
Based on observed data at hydrologic stations in recent 50 years,the variation trends of runoff and sediment discharge in the upper reaches of the Bahe River were analyzed.Non-parameter statistical methods of Mann-Kendal test,wavelet analysis and double mass analysis,combined with basin rainfall analysis,the interannual variability of flow and sand characteristics and mutation of the year in Bahe river basin.The results show that the distribution of flow and sediment in the Bahe River Basin is extremely uneven and the annual water and sediment transports take a significantly downward trend.Both the water and sediment sequences had particular multi-scale and multi-resolution attributes,but the scale of each was not completely consistent.The runoff and sediment transport rates were changed in 1989 and 1981,respectively,but the mutation time was different and the sediment load was more sensitive.Further analysis show that the fluctuation of rainfall is the main influencing factor of interannual variation of runoff,while the decrease of sediment load was mainly affected by the combined effects of runoff and human activities.
Bahe River BasinsedimentrainfallMann-Kendal testwavelet analysis
国家科技期刊平台
NSTL
万方数据
维普
