Comparison And Analysis Of Soil And Water Conservation Scheme And Actual Monitoring During Highway Construction Period In Arid Area

Taking S239 line ZhunDong multicoloured bay coal coal chemical industry base to jimusar highway construction project as an example,by setting positioning monitoring survey method combined with regular inspections for dynamic monitoring of soil and water loss situation in the study area,contrast analysis of the study area of soil and water conservation plan and the actual standard of soil and water conservation monitoring indicators,for later similar engineering monitoring each partition adjust measures to local conditions which provides the basis for layout of soil and water conservation facilities,It provides reference for soil and water conservation monitoring methods.(1)Through investigation tour monitoring,project of soil and water conservation measures in place,basic compared with soil and water conservation,plan in the process of actual implementation measures and engineering measures plants disturbance or omit the surface area of temporary measures are based on the actual but temporary measures does not change according to the construction progress in the process of implementing the synchronous implementation,some measures are not in accordance with the design content implementation,aeolian sand along the main road and soil field without taking sand retaining wall or barrier measures for windbreak and sand-fixation grass square.Therefore,in the process of compiling the soil and water conservation program for highway construction projects in the later stage,it is suggested to strengthen the on-site survey of the project area and improve the design of soil and water conservation measures in the project area,especially the prevention and control measures of soil and water loss in the aeolian sand area.(2)According to the monitoring data of soil and water conservation,the actual monitoring is rezoned according to the actual land cover type of the line.The primary erosion modulus is 7049t/km2·a,and the average post-disturbance erosion modulus is 8942t/km2·a.The original erosion modulus of the farmland area is 1076t/km2·a is not far from the original erosion modulus determined by the soil and water conservation scheme(1000t/km2·a).The original erosion modulus of the gobi area is 1982t/km2.The post-disturbance erosion modulus of farmland area was 4026t/km2·a and the post-disturbance erosion modulus determined by soil and water conservation scheme was 3000t/km2·a increased by 1026t/km2·a.The post-disturbance erosion modulus of gobi region is 7278t/km2·a,which is 1878t/km2·a higher than that of the average post-disturbance erosion modulus determined by soil and water conservation scheme.The reason is that the average post-disturbance modulus determined by soil and water conservation scheme is a class ratio.(3)According to soil and water conservation monitoring results show that the disturbance land reclamation rate of 96%,soil and water loss management degree reached 96%,slag blocking rate of 96%,soil erosion control ratio greater than 0.8,the vegetation recovery reached 96%,forest coverage rate reached 3%,after the implementation of monitoring results of soil and water conservation measures to achieve the target value of each index is slightly higher than that of soil and water conservation scheme report,achieved the effect of treatment of soil and water loss.