Investigation And Evaluation On The Current Situation Of Soil Erosion In The South Open Pit Of Jindui Cheng

Soil erosion is one of the most serious environmental problems faced by our country. Gold heap south open pit mining projects located in the low southern margin of the Qinling Mountains, undulating terrain is larger, and the rainfall is more concentrated, human engineering activities are frequent, resulting in project area of soil and vegetation is damaged heavily, aggravate the occurrence of water loss and soil erosion hazard. So the project area of soil and water erosion hazard investigation and evaluation of, analysis of soil erosion hazards of the general rules and project area of soil and water maintain measures of prevention and treatment of benefits, future prediction and control of the project area of soil and water loss has important significance. The main content of this thesis:(1) According to the field investigation, and the analysis of the heap gold south open pit project geological landforms, climatic characteristics, soil and vegetation and human engineering activities affecting soil erosion hazard factors.(2) Design runoff plot experiment and test set the scouring flux respectively 2.6l/min, 3.7l/min, 4.5l/min, slope respectively for 10 degrees, 20 degrees, 30 degrees combined test method used to test. Through statistic data of runoff plot experiment process middle flow and sediment analysis, obtains the variation characteristics of slope runoff plots in different erosion experiment, experiment with different slope conditions slope surface runoff velocity and hydraulic parameters with scour duration and slope sediment yield rate with the scour the diachronic variation characteristics.(3) Through erosion ditch the quadrat method. The analysis of the soil erosion caused by the erosion gully in the project area distribution and development. And through runoff plots observation of natural rainfall on soil erosion process, it is concluded that the slope soil erosion by surface erosion erosion to rill erosion and evolution process of gully erosion.(4) The soil erosion control measures in the project area the main engineering measures and plant measures, temporary measures. In this paper, through hydraulic calculation, analysis of the open ditch drainage sewage drainage, open mining field drainage, roads, water supply and drainage engineering and field soil drainage etc. engineering measures of soil and water conservation benefit of control and prevention. And through the runoff plot experiment, set the scouring flux 2.6l/min, 3.7l/min, 4.5l/min, runoff plots under the pad surface were bare slope, 30% of vegetation coverage degree, color of the cloth of the test plant measures and the Provisional Measures on control benefits of soil and water loss are analyzed.