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 increas-ingly 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 108m3 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.
Liaohe River Basineco-water requirementestimationwater resource allocation
NETL
NSTL
万方数据
维普
