Prediction Method of River Landscape Eco-Environmental Water Demand based on BIM Model.

With the continuous development of social and economic level, people's demand for cities is gradually rising, and various natural landscapes emerge as the times require. River landscape has attracted great attention for its effective utilization of river. The changes of climate, vegetation and land use pattern in river basin play a decisive role in the ecological water demand of river landscape. Taking a river basin area as an example, the current river landscape ecological water demand was estimated, and the river ecological water demand at different levels and different guaranteed rates was predicted by using the watershed distribution hydrological model SWAT. The results show that the current annual ecological water demand of river landscape is 81.09×106 m3, and the self-purification water demand is an important part of the river ecological water demand. Therefore, the key to ensure the ecological water demand of a river basin is pollution control. Through further control of pollutant, it is predicted that the ecological water demand of river landscape will decrease continuously in 2019, 2020, and 2030. The natural runoff of river can meet the ecological water demand of river landscape in flood years, but serious ecological deficiency will occur in dry years, which requires ecological water replenishment of river. [ABSTRACT FROM AUTHOR]