Experimental Study On The Behavior Of Petroleum Leaking Into The River In The Secondary Environmental Emergency Of Road Transportation Accidents

At present,my country is in a period of frequent environmental emergencies,and road transportation accidents are the second major factor in environmental emergencies.The pollution source of the secondary environmental emergency in road transportation accidents is the leakage of tankers on the highway along the river.There is often a distance ranging from zero to several hundred meters between the highway along the river and the water body.Before the leaked petroleum flows into the water body,part of it is adsorbed by the soil.When analyzing the consequences of such sudden water pollution accidents,due to the lack of basic data on the petroleum retention behavior of the soil between roads and rivers at this stage,it is difficult to accurately predict and evaluate the risk consequences.This paper artificially simulates the petroleum leakage test under a small cracked area,under the conditions of soil types(sand,loam),slope(5,10,15,20°),leakage rate(0.1,0.6,1.1,2.0L/s),studying its specific impact on the river entering time and interception of petroleum,realizing the quantitative research on the environmental risk of petroleum,and providing data support for the environmental risk assessment of petroleum road transportation.The main conclusions are as follows:(1)Whether it is sand or loam slope leakage test,the initial interception time of the same oil is approximately equal,and the initial interception time of different oils:heavy oil>gasoline>diesel,but all can enter the river within 1 min;(2)Whether it is a sandy soil or loam slope leakage test,the interception time of the same oil is approximately the same.The interception time of different oils:heavy oil>>gasoline≈diesel oil,the interception time does not change significantly with the slope,and the leakage rate increases.The power function is decreasing,and the retention time of diesel and gasoline at high leakage rate≈river entering time≈leakage time;(3)Whether it is a sandy soil or loamy slope leakage test,the time for diesel and gasoline to enter the river is approximately the same as the leakage time,and the time for heavy oil to enter the river is dozens of times longer than the leakage time;(4)Whether it is a sandy soil or loam slope leakage test,the interception of diesel and gasoline per unit area gradually becomes flat with the increase of the leakage rate.The power of the interception per unit area I and the leakage rate Q_L at each slope of diesel and gasoline is established respectively.Function I=a Q_L~b;the interception of diesel and gasoline per unit area gradually decreases with the increase of slope.The linear functions of interception per unit area I and slope S at each leakage rate of diesel and gasoline are established respectively I=aS+b,And then get the rate of change of diesel and gasoline interception per unit area with slope,sandy soil is-0.269,-0.507,loamy soil is-0.187,-0.45.The interception of heavy oil per unit area does not change significantly with the leakage rate and slope,and can be preliminarily determined to be 3-6L/m~2;(5)Under the same conditions,the simulated water leakage test on the sandy soil slope shows that the initial interception time and interception time of water,diesel and gasoline are basically the same;the interception per unit area of water,diesel and gasoline are linearly related,and R~2 is 0.986 and 0.912,respectively.(6)Through the pilot simulation test,the time of entering the river and the interception per unit area of water,diesel,and gasoline are consistent with the results of the pilot test.