辽河流域生态需水估算

从辽河流域存在的环境问题出发,在确定主要生态需水类型的基础上,基于水资源分区,分别估算各水资源分区的不同类型的生态需水,包括枯季河道生态需水、汛期输沙需水、入海需水、地下水恢复需补充的水量、河口湿地生态需水等。针对辽河流域季节性河流的特点,提出了枯水季节最小流量法的枯季河道生态需水计算方法。计算结果表明,辽河流域生态需水总量为130.44×10⁸m³,占地表径流的48.3%,其中浑太河、东辽河2个水资源分区的生态需水量占地表径流的比例在60%以上,辽河干流生态需水量占地表径流的53.5%,其余水资源分区生态需水量占地表径流的比例均在50%以下。研究结果为流域水资源配置及水环境保护与恢复提供科学依据。

Estimation of eco-water requirement in the Liaohe River Basin

The Liaohe River Basin is one of the seven largest river basins in China;along with the socio-economic development,water environmental problems have become increasingly prominent.Recovering and protecting the aquatic ecosystem has been considered as an important research for the development of northeastern region,most important of which is eco-water requirement.In view of the present main environmental problems in the Liaohe River Basin,based on the water resources districts,the types of eco-water requirement for river basins are identified.This paper raises that the eco-water requirement for river channels in dry seasons,sediment transmission water requirement in flood seasons,sea-entry water requirement,water requirement for groundwater recruitment and eco-water requirement for estuary wetlands are important components of the eco-water requirement for this watershed at present.Aimed at the characteristic of Liaohe River Basin as a seasonal river,the minimum flow method is developed to calculate the eco-water requirement for river channels in dry seasons.The eco-water requirement for each water resource district is calculated respectively,and the eco-water requirement of the whole river basin is calculated by adding up the above water requirements,with a deduction of the overlap between the trunk stream and the tributaries.As a result,the total water requirement of Lioahe River Basin is 130.44 10~(8)m~(3)or about 48.3% of the natural flow,of which the water resource districts of the Huntai and Dongliao rivers take up more than 60% of the natural flow,the Liaohe trunk stream about 53.5% and the others less than 50%.This paper can provide a scientific reference for water resources allocation and environmental protection of the river basin.