Study Of Ecological Water Requirement Of Candle Bay Water System Of Qingxiu Mountain

Candle bay water system of Qingxiu Mountain is one of the largest water landscape. While the vast water area, water landscape form varied, but the candle bay scenic area do not have a fixed water to water supply, water is static or more illiquid closed slow flow water bodies, with a small easy to pollution and water environmental capacity, water anti self-purification ability. And candles bay water system of filling water source just rely on rainfall and artificial recharge. In order to explore the different land use plan in different rainfall frequency years of ecological water demand of ecological water demand in time and space changes, choose artificial fill with the least amount of water needed for design scheme for the better, and calculates the artificial filling water in different frequencies. For the candle bay scenic area the sustainable development of ecological environment, artificial irrigation water saving, and maintain better landscape effect, the study of the ecological water demand and artificial fill water has important practical significance.By collecting the candle bay area of soil data, land use data, stream distribution data, DEM figure, etc., and Nanning city in all kinds of meteorological data from 1981 to 2010 as input data, the basis of building model platform using the distributed hydro logical model SWAT, the change of forest land and landscape green space area percentage set up on the basis of A, B two different testing scheme of land use, select the output data of different sub basin of evaporation, seepage quantity, production flow, soil moisture content the most ecological water demand calculation and the calculation of artificial fill water data, the results are as follows:From the analysis of ecological water demand of different frequency years found that with the increase of rainfall frequency, less rainfall, the ecological water demand is gradually increasing, and the rainfall frequency when P=20% and 75%, forest landscape ecological water requirement plan B than A, grew by 2.46%,2.46% respectively, and at P=50%, plan A ecological water demand increased by 3.5% than that of plan B. In rainfall frequency when P=20%,50%,75%, the green space landscape ecological water demand growth of 3.6%,3.1% and 4.4%, respectively, the waters of the landscape ecological water demand grew by 0.15%,0.15% and 1.2 respectively%; When rainfall frequency P= 20%, total solutions A and B in landscape ecological water requirement of 1468261.73 mm and 1563801.13 mm respectively; When rainfall frequency P=50%, total solutions A and B in landscape ecological water requirement of 1531268.05 mm and 1673278.82 mm respectively; When rainfall frequency P= 75%, total solutions A and B in landscape ecological water requirement of 1649678.14 mm and 1821254.31 mm respectively. When the rainfall frequency when P= 20%,50%,75%, plan B than A father-son watershed landscape ecological water demand rose by 6.5%,9.3% and 6.5% respectively.By the analysis result, concluding the following conclusions:(1) based on the principle of the water saving economy, under the different rainfall frequency, the land use plan B A landscape ecological water requirement are below, and with less rainfall, the ecological water demand needed for the plan A and plan B, its growth, the greater the visible performance in dry year this advantage is more obvious.(2) When P in frequency= 20%,50%,75%, artificial fill water needed for the year of 894761.09,956773.94,1014395.9, respectively.