簸箕李引黄灌区水沙区域分布特征

Distribution features of water and sediment areas in Bojili Yellow River Diversion Irrigation District

本文采用实测资料分析方法,研究簸箕李引黄灌区水沙区域分布特征。研究结果表明:簸箕李灌区水量区域分布均匀,沙量区域分布并不均匀,水沙区域分布的不协调性十分突出;灌区上游泥沙淤积最严重,下游泥沙淤积明显减轻;上游至下游淤积量夏秋灌最大,春灌次之,冬灌最小。悬沙颗粒组成与床沙粒径自灌区上游至下游呈细化的规律;灌区干支渠以上床沙大都是粒经大于0.05mm的沙质土,送至田间的几乎全都是小于0.04mm的泥类土。

Measured data analysis method is adopted for studying distribution features of water and sediment areas in Bojili Yellow River Diversion Irrigation District. Research results show that water quantity regions are distributed evenly in Bojili irrigation area,water and sediment areas are not evenly distributed,and the uniformity of water and sediment area distribution is very prominent. Upstream sediment deposition is the most serious in the irrigation district,and downstream sediment deposition is significantly reduced. Upstream-downstream sedimentation is the largest in summer-autumn irrigation,which is followed by spring irrigation,and winter irrigation is minimal. Suspended sediment particle composition and bed sand particle diameter show refining law from upstream area to downstream area in the irrigation district. The bed sand above main and branch channel in the irrigation district is mainly based on sandy soil with particle diameter greater than 0. 05 mm. Mud soil smaller than 0. 04 mm is completely sent to the field.