变动态存储系数法在辽宁大凌河流域河道洪水演算中的运用研究

The research of the application of Variable dynamic storage coefficient method in Daling River Basin Flood calculus in Liaoning province

本文选用变动态存储系数法进行河道洪水演算,弥补传统水文模型河道洪水演算将洪水传播时间设为定值的不足。论文选取辽宁大凌河上游大城子水文站2000—2013年15场洪水资料对模型进行率定和验证,并和传统水文模型河道洪水演算方法模拟结果进行对比研究,结果表明相比于传统水文模型,采用变动态存储系数法的洪水模拟精度有所提高,15场洪水模拟合格率提高20%。研究成果对于大凌河流域水文模拟,特别是分布式水文模拟提供较为重要的参考价值。

Landslides, mudslides and other geological disasters resulting loose soil oftenaccumulated in the riv- er shore to form large-scale accumulation body,is narrowing of the main river channel over current width, compress the main river bed, on the water movement impact.In this paper,flume experiments to study the ac- cumulation bodyunder gentle river water depth along the way and horizontal distribution.In the stackedbody under the action of river water depth along the distribution changed regularly, and its specific performance： Accumulation upstream water level obstruct higher;accumulation body segment depth drastically reduced;ac- cumulation body downstream section ,the diffusion effect ,the water level gradually returned to no accumulation bodycondition of natural water.Accumulation body near the water depth along the cross-sectional distribution compared to the natural situation as follows：accumulation bodyupstream backwater maximum in stacked side upstream, away from the accumulation body a shore,relative the cross-section ,from the accumulation of body side to the With the accumulation of body scales increased accumulation izontal distribution of has become even moreintense. water depth decreases ;accumulation body where other side of the relative depthincreases slowly. body onriver water depth along the way and hor-