分汊河段低水头枢纽两汊泄流宽度对泄洪能力的影响

Influence of discharge width ratio of two branches of a low water head project at branching channel on flood discharge capacity

位于分汊河段的低水头枢纽,其泄洪能力不仅与枢纽的总泄流宽度有关,而且与两汊泄流宽度之比有关.通过分析,当两汊泄流宽度之比与汊道两汊阻力比相协调时,枢纽河段的阻力最小,其泄洪能力达最大,且枢纽建成后对枢纽河段的影响也较小.

For the low water head water control project at a branching channel, its flood discharge capacity is related not only with the total discharge width but also with the discharge width ratio of the two branches. Analyses show that, when the ratio of the two branches′ discharge widths is coordinated with the resistance ratio of the two branches, the project reach has the least resistance, that the discharge capacity is the largest and that its influence on the project reach is less after the finishing of the project.