黄河宁蒙河道水沙变化及冲淤特性

采用断面法对黄河宁蒙河段的冲淤量进行了计算,分析了该河段的水沙变化情况及冲淤特性。结果表明:宁夏河道多年来呈微淤状态;内蒙古巴彦高勒—浦滩拐河段1962—1982年、1982—1991年、1991—2000年、2000—2008年年均淤积量分别为-0.009亿、0.379亿、0.540亿、0.620亿t;内蒙古河道2000—2008年主槽淤积量占全断面淤积量的90.9%,造成平滩流量减小,严重威胁防凌、防洪安全。

Water and Sediment Variation and Characteristics of Scouring and Deposition of Ningxia-Inner Mongolia Reach of the Yellow River

The amount of sediment deposition of Ningxia-Inner Mongolia Reach was calculated by section method in this paper,and the water and sediment variations as well as the characteristics of scouring and deposition were also analyzed.The results show that the Ningxia reach is in a tiny silting condition for years.The total amount of sediment deposition from Bayangaole to Putanguai in Inner Mongolia reach is-0.009×108 t annually from the year of 1962 to 1982,and the number is 0.379×108 t annually from the year of 1982 to 1991 and 0.540×108 t from the year of 1991 to 2000 and 0.620×108 t from the year of 2000 to 2008.The deposition in the main channel of Inner Mongolia reach accounts for 90.9% of the whole section,which causes the reduction of bankfull discharge and become a huge threat in flood season and ice flood season.