水文变异条件下的东江流域生态径流研究

Ecological Flow Evaluation Based on Hydrological Alterations in the Dongjiang River Basin

东江流域的河川径流受气候变化和人类活动的双重影响产生了水文变异,河流生态系统适应了变异前的水文状态,变异后必然会给当地生态系统带来不同程度的影响。因此,论文运用多种检验方法并结合东江流域的实际情况对其水文变异做了系统的分析。在此基础上,采用逐月频率法计算该流域4水文站的生态径流量(最小、适宜和最大生态径流),得出以下结论:①Tennant的检验表明论文的计算结果是合理的;②龙川、河源、岭下3站存在显著变异,变异后3站不满足河流适宜生态径流量的时间都出现在6月,今后应在该月适当增加调水。同时,可参照文中计算值,建立东江流域生态径流调度预警机制,为流域生态系统的健康和水资源的管理提供科学保障。

Climate changes and human activities combine to cause hydrological alterations in Dongjiang River Basin. River ecosystems have adapted to the hydrological status before variation. After variation, the local ecosystem is bound to be affected more or less. In this case, M-K test, the scanning t test and the Rank Sum Test method, combined with the actual situation in Dongjiang basin are used to thoroughly analyze the abrupt streamflow behaviors. Then the ecologi- cal flow （minimum, optimal and maximum ecological flow ） of four hydrological stations in Dongjiang River Basin is estimated by using the monthly frequency calculation technique. The re- search results indicate that： 1 ） The estimated ecological flow in this paper is reasonable when compared to those by Tennant method. 2） There are significant variations in Longchuan, Heyuan and Lingxia stations, after variations, the amount of annual streamflow does not meet the optimal ecological flow in June. So we should increase water diversion appropriately in this month in the near future. Besides, this study also provides a reference technical framework for establishing a ecological flow warning system in Dongiiang River Basin, and is also of scientific and practical merits in ecosystem health and basin scale water resource management.