大洋河河流生态需水研究

Research on ecological water requirement of Dayang River

从水生生物保护的角度出发，应用重点关注水生生物敏感期的方法时大洋河进行河流生态需水研究，即生态需水量在生物保护目标敏感期由水文断面资料、水位流量关系、生物产卵期所需水流条件共同计算确定，在非生物敏感期采用最小月流量法计算．应用该方法分别计算大洋河8-9月濒危鱼类马苏大麻哈鱼产卵期、4—6月多种鱼类产卵期、枯水期非生物敏感期所需生态流量，并根据计算结果建议在对河流开展调水工程时应考虑对生态需水量的影响及对水生生物的保护。

The method focusing on aquatic sensitive period （MFASP） based on aquatic protection is used to study the ecological water requirement of Dayang River. The ecological water requirement of the sensitive period of aquatic targets under protection was determined by the hydrological sectional data, the stage-discharge relationship and the flow condition of the spawning period, and the ecological water requirement of the non-aquatic sensitive period is calculated with the minimum monthly discharge method. The present method is applied to calculating the spawning period of cherry salmon from August to September, a species being in imminent danger, the spawning period of many kinds of fish from April to June, and the ecological discharge for the non-aquatic sensitive period in the low water season. According to the calculated result, it is suggested that the influences on ecological water requirement and aquatic protection should be considered in implementation of water diversion projects.