Abstract Reservoirs have been continuously built in the Poyang Lake Basin (PLB) for the local economy. With pending removal and reconstruction of aging reservoirs and planning of new reservoirs in this area, it is advisable to evaluate the likely impact of the existing and alternative reservoir network layouts on the hydrologic regime for more effective water resources planning and management. In this study, reservoirs of multiple sizes in the PLB were integrated into a coupled land surface-hydrologic model (CLHMS) fully coupled with a reservoir scheme. The extended model was then validated and applied to investigate the impact of existing reservoirs. Seven hypothetical scenarios were additionally set up by removing all the reservoirs, replacing smaller reservoirs with few larger ones, replacing larger reservoirs with many smaller ones, moving all reservoirs downstream or upstream, increasing or decreasing the mean inflow of reservoirs, respectively. In all, eight simulations were conducted and analyzed using the Indictors of Hydrologic Alterations (IHA) for the period of 1981–1999. Results indicate that the existing reservoirs in the PLB are able to effectively displace the excessive streamflow in the wet season to the dry season and mitigate the hydrological extremes. By increasing the mean inflow of reservoirs, the effectiveness of reservoirs in downstream flow regulation can be further enhanced. Similarly, replacing many small reservoirs with a few large ones with a same total capacity can lead to more resiliency against the downstream flow variability and extremes, only if the total mean inflow of the new large reservoirs is not considerably lower than that of the small ones. Relocating reservoirs to a different place with similar mean inflow, however, has a relatively minor and probably case-dependent impact on the hydrologic regime. On the other hand, the ecological analysis on the IHA parameters indicates that the layout preferable for the effective flow regulation may not necessarily be ecologically preferable. In general, this study comprehensively evaluates the hydrological impact of reservoir network layouts, and can provide implications for stakeholders to reach a trade-off between reservoir capacity distribution, locations and mean inflow not only in the PLB but also in different regions worldwide.

中文翻译：

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水库调节流域水资源管理：水库网络布局对水流和水文变化的影响

摘要 为了当地经济，鄱阳湖流域（PLB）不断建设水库。随着该地区老化水库的拆除和重建以及新水库的规划，建议评估现有和替代水库网络布局对水文状况的可能影响，以实现更有效的水资源规划和管理。在这项研究中，PLB 中多种规模的水库被整合到与水库方案完全耦合的耦合陆面水文模型 (CLHMS) 中。然后验证扩展模型并将其应用于调查现有储层的影响。通过移除所有水库，用几个较大的水库替换较小的水库，用许多较小的水库替换较大的水库，另外设置了七个假设场景，将所有水库向下游或上游移动，分别增加或减少水库的平均流入量。总共使用 1981-1999 年期间的水文变化指标 (IHA) 进行了八次模拟并进行了分析。结果表明，公共小巴现有水库能够有效地将雨季的过多水流转移到旱季，并缓解极端水文现象。通过增加水库平均入流量，可以进一步提高水库下游调流的有效性。同样，用几个具有相同总容量的大水库替换许多小水库可以提高对下游流量变化和极端情况的弹性，只有当新的大型水库的总平均流入量不明显低于小水库的平均流入量时。然而，将水库迁移到具有相似平均流入量的不同地方，对水文状况的影响相对较小，可能取决于具体情况。另一方面，对 IHA 参数的生态分析表明，有利于有效流量调节的布局不一定在生态上是可取的。总的来说，这项研究综合评估了水库网络布局的水文影响，并可以为利益相关者提供影响，以在公共小巴和全球不同地区的水库容量分布、位置和平均流入量之间进行权衡。对水文状况的影响相对较小，可能取决于具体情况。另一方面，对 IHA 参数的生态分析表明，有利于有效流量调节的布局不一定在生态上是可取的。总的来说，这项研究综合评估了水库网络布局的水文影响，可以为利益相关者提供影响，以在公共小巴和全球不同地区的水库容量分布、位置和平均流入量之间进行权衡。对水文状况的影响相对较小，可能取决于具体情况。另一方面，对 IHA 参数的生态分析表明，有利于有效流量调节的布局不一定在生态上是可取的。总的来说，这项研究综合评估了水库网络布局的水文影响，并可以为利益相关者提供影响，以在公共小巴和全球不同地区的水库容量分布、位置和平均流入量之间进行权衡。