黄河三角洲冲淤平衡的来沙量临界值分析

黄河三角洲在整体淤进的同时伴随着蚀退,近年来黄河来水来沙递减趋势，现行河流路海岸线淤进行减缓，原行河流流路岸线出现了严重的蚀退，三角洲造陆的趋势又速度制约着三角洲经济的持续发展和生态环境的演变，本文以近20年来黄河水文，泥沙，三角洲滨海区水深等的实测资料及卫星遥感照片为依据，研究了黄河三角洲面积变化的趋势以及与流域来水来沙的关系，得出三角洲整体趋于冲淤平衡的年来沙量临界值为2．45亿t。

Analysis of Critical Value of Inflow Sediment for Keeping the Erosion and Sedimentation Balance in the Yellow River Delta

Along with advance by sedimentation on the whole, there is also erosion backward in the Yellow River delta. Evident backward erosion had appeared in the coastline of the delta region in recent years owing to decrease of flow and sediment from the Yellow River. The continuous economic development and ecological environment evolution in the delta area are restricted by the trend and speed of land building of the delta. Based on the recorded data of the Yellow River hydrology, sediment, coastal water depth in recent 20 years as well as satellite remote sensed photos, the relation between the change trend of the area of the Yellow River delta and the inflow and sediment has been studied in the paper, which resulted into the marginal value of 245 million t/a of sediment inflow for keeping the delta area in an overall balance.