Forecast And Prevention Soil And Water Loss Of Jieliang Highway Project In Conghua

Jieliang highway lies on Conghua area in the north of Guangzhou city.Its total length is 33 kilometers.The item's main project occupies 240.9 hm² area,the temporary project occupies36.14hm² area.Two soil-fetching fields will be set along the way,which occupies 3.85 hm² area,and a soil-discarding field occupies 0.96 hm².The research analyses the soil erosion,water loss in the construction of Jieliang highway,and forecasts the new loss of the soil in the construction period.It is advised that mathematical model is direct,simple and convenient,the scheme predicted the water loss,soil erosion of item area in building period with mathematical model method.Because there are more kinds of models in view of USA Soil Loss Equation at present,and the model match with the specially characterist in CongHua,GuangZhou hasn't been builded.the scheme adopted USA Soil Loss Equation,which is A=0.224R·K·LS·C·P straightly,predicted the new added soil loss of the area occupied by the project during the construction of the highway,got suitable value of every factor.We ensured the rain eroding gene in the forcasting priod based on the whole year rainfall's distributing in every month;We adopt William Formula to ensure soil's eroding existing gene,through screene analysis and liquid moving pipes we get the soil grain grade's distributings,through K₂Cr₂O₇ capacityoil bath we get the organism's content in the soil;gave a revision to the slope degree,slope length factor and soil's factor for resisting erosing among the factors.We have built different grade experiment sloping field to simulate the rainfall eroding,amended grade and slope lenth genesuitability,through the soil'sanalysis,and according to the experience former to calculate the soil's erode-resisting gene.and ensure vegetation cover gene though CaiChongFa's research;At last we ensure the water,soil holding gene through looking into the intance of land's use in the item area.Analysed and discussed the highroad's important measure protectingsoil and water--vegetable measure's water and soil holding mechanism,got the information that the roots played the most important water and soil holding boot,and through experiment to got,the roots played absolute holding boot in the 20^th week after breeding the seed.Through the calculation of the original relief and disturbing relief's water loss,soil eroding in the period of constructing,it is anticipated that the new soil loss in construction period is 192383.4t.According to the characteristics of the project itself, the construction region is plotted into several areas with corresponding prevention measures for each area.24895900 yuan will be invested in the water,soil preventing and curing project.After the execution of the water,soil keeping scheme,through engineering,vegetation and other synthetical measures,the water loss,soil erosion can be controlled effectively,the appear can be guarded effectively,the area fitting forests and grasses can be clothed with greenery.The scheme could bring remarkable ecology and society benefits to building area.It will not only control soil loss 227604.1t which will be lead by the constructing item,but can also control original water loss,soil eroding.225.4hm² land in the area which is suitable for virescencing will be virescenced,and protect the growing of peripheral plants.92.463hm² vegetation area will be destroyed in construction,we can not only compensate original vegetation,but also increase 121.417hm² vegetation area.It will improve zoology status quo.