Security Analysis of the Ecological Water Demand of Beijing Wetland Parks

Based on the field survey of 42 wetlands sites that could be constructed as wetland parks in different districts and counties in Beijing,the main types of water resources for the ecological water demand of wetland park in Beijing were analyzed from the viewpoint of the concept of ecological water demand.The wetland ecological water demand of wetland park was portioned into three different levels from the viewpoint of minimum and favorable ecological water demand by the investigation of field water resource supplementation and indemnification of the ecological water demand of wetland parks in Beijing,which was analyzed from the point of utilization of recycled water.The results showed that the main water resource of the ecological water demand of wetland park in Beijing was comprised of four types of water including the natural precipitation,the underground infiltration,the transit water and recycled water;Of the 42 wetland sites,39 wetlands operate under the conditions of full enough water resource that could meet the minimum ecological water demand based on the amount of water supplementation from the local area,comparing those operating under a favorable ecological water demand,which reached 11.However,the amount of water resource of 3 wetland sites does not meet the minimum ecological water demand because of the insufficient supplementation from the local area;In general,the efficient utilization of recycled water in Beijing makes the minimum ecological water demand accessible and guarantees the basic use of water resource in wetland parks.