Hydrological Response Simulation And Analysis Of The Dabie Mountain Area In Anhui Province

Water is the basic elements of the ecological environment. The study ofwater resources and human relations within the basin-wide hydrology is thestudy of the current hot spots, the traditional concept of lumped hydrologicalmodel has been difficult to meet the actual needs but the distributedhydrological model and remote sensing, geographic information systemscombining to solve new problems is an effective means to new challenges. Thiscombination is an important direction of development. Soil erosion is animportant factor in causing non-point source pollution. The study area wasselected in the Dabie area, because of the small watershed in the Huaihe RiverBasin, in the remote mountains of Huoshan County, the storm center of theDabie Mountain area, serious soil erosion due to the special geographicallocation and natural environment factors, the small watershed, the soil severelydamaged surface, resulting in some land to loss the basic of use value, a greatimpact on agricultural production, has seriously hampered local economicdevelopment. Therefore, to study the soil erosion law has a great significancefor water conservation measures, as well as the sustainable development oflocal economy.In this paper, ARCGIS-based distributed hydrological model SWAT modelhas exercised in Huoshan County Jiangzihe River basin to simulate surfacerunoff. By the field sampling and laboratory analysis combination methods,and establish the spatial and attribute database of the study area to discuss theapplicability of the model, and using calibration parameters study DEM、landuse change and runoff relationship. Study are as follows:(1) The SWAT model can be applied to the Jiangzihe River runoffsimulation.Take advantage of Soil and Water Conservation Experiment Stationmeasured data to evaluate the applicability of the model. In calibration period of2009years, average daily flow measured values compared with thesimulated value obtained Nash-Suttcliffe coefficient of0.86, the relative erroris0.11, the correlation coefficient of0.95,and in the validation period of2010years, average daily flow measured and simulated values, the Nash-Suttcliffecoefficient of0.76, the relative error is0.05, the correlation coefficient was0.86, indicating that the SWAT model to good effect, the SWAT model in thestudy area in daily of time can accurately simulate the runoff. Reach modelrequires that the SWAT model can be applied to the study area.(2) Study relationship of different DEM resolution and land-use changebetween runoff.By ARCGIS generated different DEM resolution, two of the study arealand-use maps through remote sensing image interpretation, to analysis therelationship of runoff simulation value of the DEM and land use change. Theresults show that: as DEM resolution reduction, the runoff subside. Whenrunoff is small, the DEM resolution has a significant effect. Structural changesin land use, forest land to reduce and the increase of arable land, leading tosimulated runoff values increase, indicating: woodlands can reduce runoff,human reclamation affect runoff.