论文部分内容阅读
双环法是测定土壤入渗速率最为广泛最为经典的方法,但双环直径可能影响土壤入渗速率测定结果,因其为地表积水有压入渗,在坡地上测定时,因整平地表时会产生很大扰动,从而产生测定误差。研究设计5组不同直径的双环入渗试验,分析双环直径对土壤初始入渗速率、稳定入渗速率、累计入渗量的影响。结果表明:当双环内环直径分别为15,20,25,30cm时,初始入渗速率分别是常规内环直径为35cm双环的88.3%,110.8%,119.9%,100.7%,稳定入渗率分别是54%,73%,85%,89%。对不同时刻入渗速率进行T值检验发现,用内环直径为20,25,30cm双环测定的入渗过程与常用内径为35cm的双环测定土壤入渗过程无显著差异。考虑地表扰动因素、试验需水量等多因素的影响,可用内环直径20cm、外环直径为35cm的双环替代目前常规内环直径为35cm,外环直径为50cm的双环,用于坡地土壤入渗速率测定,可以减少地表扰动,从而准确测定土壤入渗率,又能节约用水量。
Bicyclic method is the most widely used method for determining soil infiltration rate. However, the diameter of bicyclic ring may affect the result of soil infiltration rate measurement. Because of the infiltration into the surface water, when measured on the slope, Have a great disturbance, resulting in measurement error. Five sets of double-ring infiltration tests with different diameters were designed and studied. The influence of double-ring diameter on initial infiltration rate, steady infiltration rate and cumulative infiltration rate was analyzed. The results show that the initial infiltration rates are respectively 88.3%, 110.8%, 119.9% and 100.7% of the diameter of the conventional inner ring of 35 cm when the diameters of the inner rings of the double rings are 15, 20, 25 and 30 cm respectively. It is 54%, 73%, 85%, 89%. T-value test of infiltration rates at different times showed that there was no significant difference between infiltration process measured by bicyclic rings with internal diameter of 20, 25 and 30 cm and soil infiltration process measured by bicyclic ring with internal diameter of 35 cm. Considering the disturbances of surface disturbance and the water requirement of test, the double ring with internal ring diameter of 20cm and external ring diameter of 35cm can be used to replace the conventional double ring with internal ring diameter of 35cm and external ring diameter of 50cm for soil infiltration Rate determination can reduce surface disturbances, so as to accurately determine the soil infiltration rate, but also to save water.