摘要
以实测资料为依据 ,结合数学模型 ,重点探讨了粗细泥沙在三门峡汇流区及黄河下游河道的调整机理。计算分析表明 ,拦减粗泥沙对汇流区与黄河下游的减淤量比值约为 0 .5,其减淤效果主要在下游。对下游而言 ,1974～ 1990年若将进入下游的粗泥沙含量控制在 15%～ 2 0 % ,则减淤比变化范围为 0 .6 5～ 0 .80 ,且减少的主要为粗颗粒泥沙。
The regulation mechanism of coarse and fine sediment in Sanmenxia confluence region and in the lower Yellow River is studied as the key issue on the basis of recorded data and combining with mathematical model. The analysis and calculation show that detention of coarse sediment will result in the ratio of 0.5 to the sedimentation reduction respectively for the confluence region and the lower Yellow River, therefore, the main effect of sedimentation reduction is in the lower Yellow River. If coarse sediment concentration of entering to the lower Yellow River had been controlled between 15?% to 20?% from 1974 to 1990, there would have been the ration of sedimentation reduction of 0.65 to 0.80 and with mainly decreased coarse sediment in the lower Yellow River.
出处
《人民黄河》
北大核心
2000年第6期13-15,共3页
Yellow River
基金
国家重大自然科学基金和水利部联合资助项目!(59890 2 0 0 )
关键词
粗泥沙
减淤
泥沙调整
黄河下游
河道淤积
coarse sediment
sedimentation reduction
sediment composition
sediment regulation
the lower Yellow River.
