海州露天矿排土场边坡土壤抗冲性空间变异性特征

Spatial Variability Characteristics of Soil Anti-scouribility of the Side Slope in the Refuse Dump of Hai Zhou Strip Mine

为了深入研究坡面侵蚀过程机理,加快矿山废弃地土地复垦进程,以辽宁省阜新市海州露天矿排土场为研究对象,针对多年来土地复垦的治理成效,运用传统统计学和地统计学相结合的方法,基于GIS技术研究排土场边坡土壤抗冲性的空间变异性特征。结果表明:①土壤抗冲指数的理论模型为高斯模型;②在坡面尺度范围内,土壤抗冲指数具有中等程度空间变异性,块金系数Co/(Co+C)为34.2%,具有中等强度的空间相关性,有效变程为16.85m;③土壤抗冲指数的空间分布表现为沿坡长方向,从坡顶到坡底脚,呈现先减小后增大的趋势,最大值位于坡顶处,最小值以"岛状"位于坡面中部;④随时间的增加土壤抗冲指数呈增大趋势。

In order to make a deep study on the erosion process mechanism of Soil-rock-mixture slope to accelerate the reclamation process of abandoned min lands,it was selected the Haizhou open pit dump of Fuxin City,Liaoning Province as the researching object for the governance of effectiveness of land reclamation over the years.Method of traditional statistics and geo-statistics combined with GIS was applied to determine and quantify the spatial variability characteristics of soil anti-scouribility in the dump slope.The results show that：① the theoretical model of soil anti-scouribility index is Gaussian model;② within the slope scale,soil anti-scouribility index belongs to moderate variability with the nugget factor Co/（Co＋C）of 34.2%,belonging to a moderate spatial correlation.The effective range is 16.85m;③ the spatial distribution of soil anti-scouribility index shows that along the slope length direction,from the top to the toe of slope,it decreased first and then increased,the maximum lies on the top of the slope,the minimum lies in the middle of the slope with the shape of ＂island＂ type;④with the increasing of time,the soil anti-scouribility index shows an increasing trend.