Relationship between sediment delivery ratio and basin area in Yellow River basin
The ability of a basin to transfer water and sediment can be represented by the basin's Sediment Delivery Ratio (SDR).Studies of the SDR are not only significant to unfold the change of water-sediment flux and the shift of the pattern by which the watershed transfers water and sediment,but also helpful in making decision and taking measures for basin's soil and water conservation.With the gauged data in 1980s and soil erosion map obtained in the same period,taking the basins of the Yellow River mainstream and its major tributaries as the study area,using the definition of SDR,this paper studies the relationship between SDR and basin area.Results reveale that SDR sharply decreases as basin area increases.When the basin area is about 0.15 million km2,SDR drops to its least value 0.183.However,as the basin area increasing,SDR begins to increase slightly but is never larger than 0.352.The wavelet analysis is applied to SDR and basin area data,and the results show that a threshold area exists in the variation trend of SDRs vs basin area.This result challenges the common knowledge that SDR tends to decrease as the basin area increases.The results are of high value of reference for basin soil and water conservation practices and ecological construction.
Yellow River basinsediment delivery ratiobasin areawavelet analysis
国家科技期刊平台
NSTL
万方数据
维普
