摘要
坡耕地细沟发育情况影响水土流失,细沟形态主要通过其参数来反映。传统测量细沟参数的方法耗时耗力,以激光扫描为代表的遥感技术可快速获取高精度地形数据,进而提取细沟参数。开展基于激光扫描与GIS(地理信息系统)的水土流失参数提取方法研究,快速获取细沟形态参数,评估各参数之间的关系。结果表明:基于激光扫描方法可以获取精度±2 mm的地形结果,可以满足水文参数提取需求。随着坡面坡度增大,各细沟参数中,细沟长度、平均深度有所增加;细沟平均宽度、弯曲系数有所减少,说明随着坡面坡度的增加,细沟发育程度有所提高。本方法可以较好地刻画水土流失情况,且一定程度上揭示了不同坡度坡面上细沟发育情况。
Soil erosion can be mostly affected by the rill development in sloping cultivated land.The rill morphology is mainly reflected by its parameters,but the traditional method of measuring rill parameters is time-consuming and labor-intensive.Remote sensing technology represented by laser scanning can quickly obtain high-precision topographic data and then extract rill parameters.This paper carries out research on the extraction method of soil erosion parameters based on laser scanning and GIS(Geographic Information System),quickly obtain the rill parameters and evaluate the relationship between the parameters.The results show that the terrain results with an accuracy of±2 mm can be obtained based on the laser scanning method,which can meet the needs of the estimation of hydrological parameters.As slope gradient increases,the lengths and average depths increased,while the average width and bending coefficient decreased,indicating that the development degree of rills increased with the increasing of slope gradient.Overall,this method can better describe the soil erosion,and reveal the development of rills on slopes with different gradients.
作者
刘欢欢
段光耀
翟淑花
冒建
于家烁
王云涛
LIU Huanhuan;DUAN Guangyao;ZHAI Shuhua;MAO Jian;YU Jiashuo;WANG Yuntao(Beijing Institute of Geology,Beijing 100120,China;Beijing Water Sciences and Technology Institute,Beijing 100048,China)
出处
《北京水务》
2022年第1期39-44,共6页
Beijing Water
基金
北京市自然科学基金项目(8182022):“北京西山坡面泥石流启动机理模型实验与仿真研究”
北京市自然科学基金项目(8202026):“沟道侵蚀型泥石流产汇流机制及监测预警研究”
北京市工程技术中心开放基金(ERC-KF-2021-007-SZY):“基于激光雷达与多波束的潮白河河道地形测绘技术研究项目”。
