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三峡工程蓄水运行后新江口水沙特性变化分析
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Abstract:
三峡工程蓄水运行后，随着出库泥沙大幅减少，造成下游水流挟沙能力处于不饱和状态，改变了原有河道特性及冲淤变化条件，水文站测验受到不同程度的影响。本文以荆江三口之一，松滋新江口水文站为例，通过蓄水前后新江口站附近河段断面冲淤变化，测站水沙变化特征分析，表明三峡工程蓄水运行后，新江口站水文断面有一定的冲刷，断面分流比变化不大而分沙比有逐年增加的趋势。
After the operation of the Three Gorges Reservoir (TGR), the sediment carrying capacity in the downstream flow is in an unsaturated state due to clear water release, which changes the scour and silt characteristics of the original channel. The west branch of Songzi River was selected to analyze the change of scouring and siltation at Xinjiangkou cross-section. The results show that after the impoundment of TGR, the water diversion ratio is changed a little while the sediment diversion ration is increasing annually at the Xinjiangkou cross-section.
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