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首页> 外文会议>AWRA's 2000 Summer Specialty Conference on Riparian Ecology and Management in Multi-Land USE Watersheds Aug 28-31, 2000 Portland, Oregon >EFFECTS OF HYDROPOWER DEVELOPMENT ON THE SOUTH FORK AMERICAN RIVER, CALIFORNIA
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EFFECTS OF HYDROPOWER DEVELOPMENT ON THE SOUTH FORK AMERICAN RIVER, CALIFORNIA

机译：水电开发对加利福尼亚南叉美国河流的影响

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摘要

The upper watershed of the South Fork American River has been developed for consumptive water use and hydropower for over a century. The riparian vegetation associated with over a dozen streams has been subjected to the historical and continuing impacts of this development. Accidental and managed spills from flumes and canals have caused scouring and mass wasting on hillsides and in tributary channels. Enlargement of four natural lakes to serve as water storage for the project inundated several hundred hectares of wetland and coniferous forest. Spills from lakes during extreme runoff events have caused downstream erosion. Complex changes in natural flow regimes have occurred throughout the watershed, contributing to erosion and aggradation in downstream reaches. Changes in flow regime may also be responsible for impaired riparian vegetation regeneration. Detecting hydropower effects is confounded by historical and present land uses such as highway construction, residential development, grazing, recreation, and timber harvesting. The upper watershed is geologically unstable and has experienced large, intense wildfires. The January 1997 peak flows of record devastated many channels, further obscuring project impacts. Beaver and domestic animal grazing continue to curtail riparian shrub regeneration. Long-term monitoring of riparian vegetation dynamics and sediment transport is recommended to gain a better understanding of hydropower effects.
机译：在过去的一个多世纪中，南叉美利坚合众国河上游流域已被开发用于消费水和水力发电。与十几条河流相关的河岸植被受到了这一发展的历史和持续影响。水槽和运河的意外泄漏和管理泄漏已导致在山坡和支流通道上的冲刷和大量浪费。扩大了四个天然湖泊，为该项目蓄水，淹没了数百公顷的湿地和针叶林。极端径流事件期间湖泊溢漏造成下游侵蚀。在整个流域中，自然流态发生了复杂的变化，导致下游河段的侵蚀和积聚。流动状态的变化也可能是造成河岸植被再生受损的原因。水电影响的检测与历史和当前土地用途（例如高速公路建设，住宅开发，放牧，娱乐和木材采伐）混淆。上游分水岭地质不稳定，经历了强烈的大火。 1997年1月的记录高峰流量破坏了许多渠道，进一步掩盖了项目影响。海狸和家畜放牧继续减少河岸灌木的再生。建议对河岸植被动态和泥沙输送进行长期监测，以更好地了解水力发电的影响。

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