利用自排沙廊道排沙降低潼关高程的论证

Tongguan elevation reduction by using flushing gallery

简要阐明了方案提出背景,寻找替代"小浪底蓄清排浑"运用方案,降低潼关高程解除渭洛河下游洪涝灾害根源.潼关河段低温期上段冲刷河床高程抬升,高温期上段淤积河床高程下降,都给下游输送大量泥沙.根据三门峡水库由太安站溯源冲刷向上发展降低潼关高程的实例,以及东雷抽黄站自排沙廊道降低局部侵蚀基准面产生溯源冲刷使渠道淤积面高程下降的实例,选择在三门峡水库布设自排沙廊道降低局部侵蚀基准面产生溯源冲刷降低潼关高程方案,该方案可使粗沙不入小浪底水库,潼关高程得以下降,三门峡水库增加库容,兴利效益得以提高,三方受益.

This paper expounds the project＇s background and seeks the measure to replace the original approach of storing clear water and releasing muddy flow in Xiaolangdi reservoir, so as to lower the Tongguan elevation and to reduce the flood disasters in the Weiluohe river＇s lower reaches. Analysis shows that in Tongguan reach, bed elevation increases when scouring occurs in the upper reach at low temperature, and bed elevation declines when silting occurs in the upper reach at high temperature. Both situatious would transport a lot of silt to the lower reaches. Authors deal with the layout and optimization of flushing gallery by analyzing two examples. One is the drop of Sanmenxia Reservoir level which causes headcut scour, and the other is drawing water from the Yellow River to Donglei to lower the bed elevation. The project of using the flushing gallery in Sanmenxia to lower the Tongguan elevation would intercept coarse sands before entering Xiaolangdi reservoir so as to lower the Tongguan elevation and increase Sanmenxia reservoir＇s total storage.