石漠化边坡及其植被板槽的地下渗漏一体化综合观测技术及应用模拟OA北大核心CSTPCD

[Objective]The surface and underground soil erosion of rocky desertification slope with poor topsoil is serious,which limits the vegetation restoration in this area.The ecological protection of soil and water conservation is a hot issue in the construc-tion of green highway.[Methods]Combined with the engineering requirements of soil and water conservation in the rocky deserti-fication slope of Laidu section of Heba Expressway in Guangxi,the integrated comprehensive observation technology of under-ground leakage of rocky desertification slope is developed,and the generalized model of integrated comprehensive observation of soil and water loss of rocky desertification slope and its vegetation plate slot are simulated and analyzed by numerical experiment.[Results]The numerical test result showed that,when the rocky desertification slope was only covered with a thin layer of soil,the total underground leakage reached more than 65%,with the increase of karst fissure rate and fissure inclination,the percent-age of bedrock fissure leakage increased,and the percentage of leakage from the epikarst zone decreased;after the vegetated and earth-filled slab trenches were installed on the rocky desertification slope,and the anti-seepage material at the bottom of the slab trench was not included,the percentage of the total underground leakage became around 40%,and reduced by more than 25%in comparison with the rocky desertification slope which was only covered with a thin layer of soil.The water retention efficiency of vegetated slab trenches on rocky desertification slope increased with the increase of vegetation cover;the increase of slope gradi-ent would cause the increase of underground leakage on exposed slopes,thus it was necessary to strengthen the construction of slope rainfall runoff collection and rain catchment surface function on rocky desertification slopes.[Conclusion]The research result can provide theoretical basis for the field research and engineering application of ecological protection measures of soil and water conservation in rocky desertification slope.