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Sedimentation in Sierra Nevada Reservoirs

机译：内华达山脉水库的沉积

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Water resources in the Sierra Nevada are managed with a complex network of storage, diversion, and conveyance facilities. The hundreds of dams throughout the range have greatly altered sediment transport. compilation of sedimentation records from reservoir surveys suggests that sediment yields from most catchments in the mountain range are generally less than 100 m~3km~-2yr~-1 (0.2 AF mi~-2 yr~-1). Although larger dams seem to have sufficient space to accumulate sediment for centuries, some smaller reservoirs have lost much of their capacity in just a few years or even in a single storm. Operation of these smaller structures has required removal of the accumulated sediment at major expense. Several options for coping with sediment problems in small reservoirs are being explored. Erosion control as aprt of a comprehensive watershed management strategy may limit the sediment supply in the long term. Redesign of structures to allow sediments to pass through the dams during high flows may offer the best hope for both operations and the stream system.
机译：内华达山脉的水资源是通过复杂的存储，转移和运输设施网络进行管理的。整个范围内的数百座水坝极大地改变了沉积物的输送。来自水库调查的沉积记录汇编表明，该山脉大多数流域的沉积物产量通常小于100 m〜3km〜-2yr〜-1（0.2 AF mi〜-2 yr-1）。尽管大型水坝似乎有足够的空间积聚沉积物已有数百年之久，但一些小型水库却在短短几年甚至一次暴风雨中丧失了大部分容量。这些较小的结构的操作需要花费大量费用来去除积聚的沉积物。目前正在探索几种解决小型水库沉积物问题的方案。从长远来看，作为综合流域管理策略的一部分，侵蚀控制可能会限制沉积物的供应。重新设计结构，使泥沙在高流量时能够通过大坝，这可能为作业和河流系统提供最大希望。

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