大伙房水库下游河道内最小生态需水量研究

Research on Minimum Ecological Water Requirement in Downstream River of Dahuofang Reservoir

为了使Tennant法更适合计算大伙房水库下游河道内生态需水量,对Tennant法计算标准进行修正,考虑了河流丰、平、枯水文变化特征,采用典型年逐月径流量修正Tennant法计算的生态需水量,不仅体现了天然河流水文变化特征,使计算的最小生态需水量更科学、更合理,而且减少了大伙房水库一些不必要的弃水,减轻供水期,尤其是枯水年供水期的水量分配压力。

In order to make Tennant method more suitable for calculating downstream fiver ecological water requirement of Dahuofang reservoir. Based on fixed calculation of standard of Tennant method, the hydrological variation of fiver when in high, normal and low flow were considered in the calculation. Tennant method with amendment of monthly runoff in the typical year was used to calculate the downstream ecological water requirement. This method reflects the hydrological variation of fiver ,and makes the calculation of the minimum ecological water requirement more scientific and reasonable as well. Meanwhile some unnecessary abandoned water would be reduced and water supply pressure of the water allocation would be relieved especially in the dry year.