摘要
依据实测资料，分析了黄河中游秃尾河流域治理对河道冲淤演变影响的机理；初步探讨了流域治理后河道冲淤演变与减沙系数及减水系数的关系。研究表明，流域治理对河道冲淤演变的影响程度和效应与减沙减水比有关，从秃尾河流域在分析时段的平均值看，当减沙减水比在２．５左右时，可保持河道冲淤相对平衡；就增大河流水力强度、减少河道淤积而言，秃尾河流域治理对减少坡面产沙作用不大。
Effect mechanism of the Tuwei river watershed regulation upon the channel scouring and deposition processes is analyzed.Based on the measured data,the relationships of channel scouring and deposition with sand reduction coefficient and water reduction coefficient are investigated.It is found that effect degree of the watershed regulation upon the channel scouring and deposition processes is closely related to the ratio of water and sand reduction.On average,when the ratio of water and sand redution is at 2.5,the Tuwei river can maintain relative equilibrium on scouring and deposition.From the view of increasing the river hydraulic intensity as well as reducing the channel deposition,the Tuwei river watershed regulation has no apparent effect on reducing sand production from sloping field.
基金
国家自然科学基金
水利部联合资助
