引黄灌区总干渠挟沙能力时空变化及其影响因素研究

引黄灌区挟沙能力特性研究一直是泥沙研究的重要课题。以包头镫口扬水灌区总干渠为研究对象,分析了影响总干渠挟沙能力的因素。结果表明影响总干渠挟沙能力的主要因素是流量、悬沙中值粒径、来水含沙量。总干渠挟沙能力沿程变化规律是离泵站出水口越近挟沙能力越大;时间变化规律是春灌期挟沙能力小于其他三个灌水期的挟沙能力,秋灌期挟沙能力最大。总干渠挟沙能力在春灌初期小于来水含沙量;其他时段挟沙能力大于来水含沙量。

Study on the spatial-temporal variation and influence factors of sand discharge capacity in main canal of the Yellow River Irrigation Area

Study on the sand discharge capacity in the Yellow River irrigation area has been an important topic of the sediment research.this article analyzes the main factors influencing the sand discharge capacity of the main canal as the main canal of Baotou Dengkou pumping irrigation district as the object.The results show that the main factors influencing the sand discharge capacity of the main canal are flow,suspended sediment median particle and inflow sand content.Variation rule of the sand discharge capacity for the main canal is that the sand discharge capacity is larger when it was closer to the pump station outlet.The time change rule was that:The sand-carrying capacity is less during the spring irrigation period than that during the other three irrigation periods;the sand discharge capacity will reach the maximum during the autumn irrigation period.The sand discharge capacity of the main canal is less than that of the inflow sand content at the beginning of the spring irrigation period,while the capacity was more than the inflow sand content during the other periods.