实测坡度差异分析

Analysing field measured slope differences

坡度是地表固有属性,对坡度的可量测性、量测方法等存在着不同的观点。文中利用常规的测量手段,利用全站仪、罗盘、1米长的直钢管等工具,实测地面最大坡降方向地面线的不同坡度。通过精度分析,论证了实测坡度的可靠性以及分析了不同方式确定的坡度的差异性。同时对不同形式的地面线的坡度进行对比分析,发现下割线、拟合线坡度稳定性优于上切线,且下割线与拟合线坡度具有较好的吻合程度,拟合线表现出更好的稳定性。建议坡度实测时最好实测剖面线采用拟合的方式确定地面点坡度,若在保证测量点高程精度的条件下亦可直接测量下割线坡度。

Slope is an inherent attribute of the land surface,but there still have no consensus on the scalability and measuring methods.In this study,traditional measurements including total station,compass and straight steel tube with 1-meter have been used to measure the slope in the direction of the maximum slope.Then the reliability of the field measured slope and the slope determined by different ways have demonstrated through precision analysis.The findings show that the performance of the slope stability derived from the fitting line and the lower secant line is better than upper tangent line,the slope of the fitting line is quite consistent with the slope of lower secant line,and shows better resistance.It is recommended that fitting line should be used to determine profile lines when measure slope in the field,and lower secant line can also be used when the elevation accuracy has a good controlling.