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首页> 外文期刊>Journal of the American Water Resources Association >IMPACTS OF DAMS ON FLOW REGIMES IN THREE HEADWATER SUBBASINS OF THE COLUMBIA RIVER BASIN, UNITED STATES
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IMPACTS OF DAMS ON FLOW REGIMES IN THREE HEADWATER SUBBASINS OF THE COLUMBIA RIVER BASIN, UNITED STATES

机译：DAMS对美国哥伦比亚河流域三个头水流域流域系统的影响

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摘要

We compared long-term changes in flow regimes resulting from climate change with those resulting from dams in three matched pairs of natural and modified headwater subbasins of the Columbia River. Based on the analysis of 12 flow-regime metrics, we found that damming had minimal effect on most quantity of flow metrics, but major effect on timing of flow metrics, especially those representing "spring runoff." In all modified subbasins, "spring runoff metrics occurred much earlier than natural flow (up to ～44 days earlier for April-July flows). Storage capacity modulated the magnitude of timing of flow-metric changes, with the largest storage capacity leading to the most change. However, even in subbasins with low storage capacity, we found significant change in most timing of flow metrics. We also found that damming, especially in subbasins with higher storage capacity, overwhelmed climate variability in all basins for most flow metrics. This shows that reservoir operations need to be modified to more closely match the natural timing of flow regimes to promote positive ecologic response in modified rivers, even in basins where quantity of flow metrics have not changed substantially as a result of damming.
机译：我们比较了在哥伦比亚河的三对天然和改良源水流域中，气候变化导致的长期流量变化与大坝造成的流量变化。通过对12种流量状况指标的分析，我们发现筑坝对大多数流量指标的影响最小，而对流量指标的时间安排（尤其是代表“春季径流”的指标）的影响最大。在所有经过修改的子流域中，“春季径流指标的发生时间比自然流量要早得多（4月至7月的流量要早至约44天）。存储容量调节了流量指标变化时间的幅度，最大的存储容量导致了流量的变化。但是，即使在储水量较低的子盆地中，我们发现大多数流量指标的时机也发生了显着变化；我们还发现，筑坝，尤其是在储水量较高的子盆地中，对于大多数流量指标而言，所有盆地的气候变化性都是无法克服的。结果表明，即使在大坝导致流量指标没有实质性变化的盆地中，也需要对水库的运行进行修改，使其更接近流态的自然时机，从而在经过修改的河流中促进积极的生态响应。

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