A Study Of Urban River's Ecological Water Demand

The amount of ecosystem environmental water demand for the river is one of parts of ecological water. The water for the urban river ecosystem is a research category that belongs to the river ecological water demand.The water for the urban river is a new conception to ecosystem environmental protection and ecosystem repair or improvement. It definitudes that the quantity of the water for the urban river is benefit to carry out the river water resources in reason and ensures the urban river develop continuously. The research to the water for the urban river has important meaning and practical value for saving water, using water resource availability, controlling river pollution and improving the ecosystem environment.The thesis discussed the special function of the urban river, and studied the connotation and the component. They consist the water for the living creature, for self-purification, for balance evaporation, for the plant near the bank and for clashing the sand etc. The thesis discussed the problems of the existent method, and elicited the suited account pattern.Every factor is unaided except the water for living creature and for self-purification. At the original river ecosystem system does not need to change to set up or rebuild, the water for self-purification contain the water for living creature. At the river ecosystem system needs to change to set up or rebuild, we must calculate the water for living creature.The thesis analyzes the different urban river's peculiarity of the north, south, mountain area and seashore, then gives a homologous calculation model respectively.Finally, the calculation model that this text put forward is made use of compute the Shahe ecological water demand.The Shahe is a anabranch of the Fuhe, its discharge is 10m~3/s. Through the calculation, we know the Shahe needs 14.0423m~3/s for ecological water in 2005 , but the water for the life about 3.7037m~3/s,the industry takes the water about 1.7361m~3/s, then 4.5602m~3/s only can be used to the ecosystem.It is predicted that the Shahe will need 14.2579m~3/s for ecological water , and the other aspects will also vary in 2010. As we have known the exploitation circumstance of the Shahe water resources, we can provide the dependable basis on the view of configuring water resources and give the project of making use of the Shahe water resources.