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首页> 外文会议>International Conference on Hydroinformatics >EFFECT OF SEDIMENT RELEASING OPERATION FROM RESERVOIR OUTLETS ON THE WATER TREATMENT PLANT DOWNSTREAM
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EFFECT OF SEDIMENT RELEASING OPERATION FROM RESERVOIR OUTLETS ON THE WATER TREATMENT PLANT DOWNSTREAM

机译：水库出水口除沙作业对污水处理厂下游径流的影响

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摘要

With steep slope and strong rainfall intensity, landslide and debris flow could generate huge amount of sediment yield from the watershed, typically during typhoon floods in Taiwan. As huge amount of sediment moving into a reservoir, serious sedimentation problem could reduce storage of reservoir due to decrease of flow velocity and lack of sufficient sediment releasing bottom outlet. Therefore, using flood discharge to release sediment during Typhoon or rain fall duration is very important. This study adopts the data of field observation at outlet structures of the Shihmen reservoir to establish the operational strategies of sediment releasing rule for providing secured water supply at downstream river intake. Based on the numerical simulation by using 2D model coping with field data, the relationship of sediment concentration between the Shihmen reservoir and downstream withdraw intake at the Yuanshan weir can be established. The sediment concentration reduction ratio is calculated to be 89% from the Shihmen reservoir to the Yuanshan weir. This study also focuses on the reduction of sediment concentration released from bottom outlet by adding clear water from the tunnel spillway. From simulated results, when the extra discharge of tunnel spillway reaches 830m~3/s in a specific event, the influence of reducing sediment concentration to downstream river by opening tunnel spillway can maintain water supply of downstream withdraw intake at Yuanshan weir. In practiceal cases, when using the added water from tunnel spillway to reduce sediment concentration during Typhoon Haitang and Typhoon Wipha, the sediment concentration at Yuanshan weir can reduce water turbidity lower than 6000NTU that can be treated by water treatment plant.
机译：在陡峭的坡度和强降雨强度下，滑坡和泥石流通常会在台湾台风洪水期间从流域产生大量的沉积物。由于大量的泥沙进入水库，严重的泥沙问题会由于流速降低和缺乏足够的泥沙释放底部出口而降低水库的储存量。因此，在台风或降雨期间使用洪水排放来释放沉积物非常重要。本研究利用石门水库出口结构的现场观测数据，建立了泥沙释放规律的操作策略，以为下游河道提供安全的供水。基于二维模型和现场数据的数值模拟，可以建立石门水库与元山堰下游取水口之间泥沙浓度的关系。据计算，从石门水库到元山堰，泥沙浓度降低的比例为89％。这项研究还着重于通过增加隧道溢洪道的清水来减少从底部出口释放的沉积物浓度。从模拟结果看，在特定情况下，当隧道溢洪道的溢流量达到830m〜3 / s时，通过打开隧道溢洪道降低下游河道的泥沙浓度的影响可以维持元山堰下游取水口的供水。在实际情况中，当使用隧道溢洪道的补充水降低台风海棠和台风威发期间的沉积物浓度时，元山堰的沉积物浓度可将水浊度降低到6000NTU以下，这可以通过水处理厂进行处理。

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