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Effects of the Three Gorges Reservoir on the hydrological droughts at the downstream Yichang station during 2003–2011

机译：三峡水库对宜昌下游站2003-2011年水文干旱的影响

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摘要

Since the Three Gorges Reservoir (TGR) was put into operation in June 2003, the effects of the TGR on downstream hydrology and water resources have become the focus of public attention. This article examines the effects of the TGR on the hydrological droughts at the downstream Yichang hydrological station during 2003–2011. The two-parameter monthly water balance model was used to generate the monthly discharges at the Yichang station for the period of 2003–2011 to represent the unregulated flow regime and thus to provide a comparison benchmark for the observed flow series at the Yichang station after the operation of the TGR. To provide a reference series for the observed monthly discharge series of the entire study period of 1951–2011, we constructed the naturalized monthly discharge series at the Yichang station by joining the observed monthly discharge at the Yichang station for the period of 1951–2002 and the two-parameter monthly water balance simulated monthly runoff at the Yichang station for the period of 2003–2011. For both the observed and naturalized monthly discharge series of 1951–2011, the hydrological drought index series were calculated using the standardized streamflow index method. By comparing the drought indices of these two monthly discharge series, we investigated the effects of the TGR on the hydrological droughts at the downstream Yichang station during 2003–2011. The results show that the hydrological droughts at the downstream Yichang station are slightly aggravated by the TGR's initial operation from 2003 to 2011. The river flow reduction at the Yichang station after impoundment of the TGR might account for the downstream drought aggravation. Copyright © 2012 John Wiley & Sons, Ltd.
机译：自三峡水库（TGR）于2003年6月投入运营以来，TGR对下游水文和水资源的影响已成为公众关注的焦点。本文研究了TGR对2003-2011年宜昌下游水文站下游水文干旱的影响。两参数月水平衡模型用于生成宜昌站2003-2011年的月流量，以代表未调节的水流状态，从而为宜昌站观测到的水流序列提供比较基准。 TGR的运作。为了为1951-2011年整个研究期间的观测月排放量系列提供参考序列，我们通过将1951-2002年期间宜昌站的观测月排放量加入到宜昌站，构造了归化月排放量序列。宜昌站2003-2011年的两参数月水平衡模拟了月径流量。对于1951-2011年的观测到的和自然归纳的月流量系列，都使用标准的流量指数法计算了水文干旱指数系列。通过比较这两个月度流量序列的干旱指数，我们研究了TGR对2003-2011年宜昌下游站水文干旱的影响。结果表明，TGR于2003年至2011年投入运行，宜昌下游站的水文干旱略有加剧。在TGR蓄水后宜昌站的河流量减少可能是造成下游干旱加剧的原因。版权所有©2012 John Wiley＆Sons，Ltd.

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