沟壑密度

随着DEM分辨率的降低，地形起伏度和高程变异系数递增，而沟壑密度和地面粗糙度递减。

As DEM resolution goes down , the relief amplitude and coefficient of variation increases , while gully density and surface roughness decreasing .

系统总结了DEM基本地形因子的提取算法，并重点对坡长、曲率、地形的起伏度、切割深度和沟壑密度因子提取的原理与算法作了深入的分析；

The author paid more attention also to analyze the principle and algorithm of flow length , curvature , relief , the earth 's surface incision and gully density .

分析得出：随着DEM网格尺寸和汇流累积阈值的增加，所提取的沟壑密度呈现幂函数趋势减小；

It obtains through analysis that along with the increase of DEM grid dimension and accumulated threshold value of confluence , the power function of extracted gully density is getting smaller ;

本文介绍基于数学形态学的沟壑密度提取算法，从TM影像中提取沟谷线信息，从而有效地解决了土壤侵蚀评价中下垫面表征因子提取问题。

An algorithm for extracting the ravine density based on mathematical morphology , which extracts the channels and vales from TM images , is introduced to solve the issue of the extraction of token factors in the evaluation of soil erosion .

以陕北黄土高原多地貌类型样区为实验样区，采用5m分辨率的DEM为基本信息源，构建不同汇流阈值与所提取沟壑密度量化关系。

By taking 5 m grid cell DEMs as an experiment basis , the relation between flow accumulation threshold and gully density in the Loess Plateau area , Northern Shaanxi , China , is investigated quantitatively and statistically .

并选取了相对高程、坡度、地面粗糙度、沟壑密度和地面起伏度5个因子，利用层次分析（AHP）和多因子加权法，提取出7类不同的山地地势起伏类型。

The five classified factors of relative elevation , slope , surface roughness , gully density and surface relief are chosen to overlay by means of AHP and multi-factor rating weighted method so that 7 different types of data of Mountains terrain relief was gain .

有部分区域水土流失已达到极强度侵蚀，土壤侵蚀模数高达9000t／（km2·a）以上，沟壑密度2km／km2，植被盖度仅为15%。

Somewhere gives the most erosion of soil and water and has more 9 000t / ( km2 . a ) of soil erode model , 2km / km2 of gully erode density and only 15 % of vegetable cover .

流域沟壑密度理论极值数学模式商讨

A discussion on the mathematical model of theoretical maximum of gully density

并以黄河流域某小流域沟壑密度的计算作了实例验证。

And the method is verified in the calculation of ravine density in a small watershed of the Yellow River basin .

地貌学研究的重要内容之一是地形分析，主要包括高程剖面分析，坡度、坡向分析以及沟壑密度、切割深度、起伏度、流域分析等。

The main content of Geomorphology research is terrain analysis , it includes such as height slice analysis , slope analysis , gully density analysis and so on .

利用图解建模分析方法建立一套沟壑密度提取分析空间数据模型，对沟壑密度的快速提取提供了一套全新的解决方案。

It built a spatial data model of getting ravine density with the method of illustrate modeling analysis , which provided the fire-new solution for extracting ravine density fleetly .

沟壑密度是反映当地气候、地质、地貌的一个基本指标，对于水土流失监测、水土保持有重要的意义。

Gully density can be used to indicate local climate , geology and geomorphology . It has an important meaning for surveying water δ soil loss and sustaining water δ soil .

对于沟壑密度的提取方法目前较为复杂，这主要由于在提取过程中所涉及到的因子数目众多，为进一步的空间分析研究设置了障碍。

The methods of getting ravine density is complex currently , because this factor is multitudinous in the process of gaining ravine density , this is a hindrance to further spatial analysis .

沟壑密度是反映地表破碎程度的重要因子，在土壤侵蚀、地貌演变等研究中有重要作用。

Ravine density , which is an important factor indicating the extent of the fragmentation of the Earth surface , plays a significant role in the research of soil erosion and landform evolution , etc.

在以沟壑密度作为主要评价因子的沟蚀研究中，航片判读方法较其它两种方法更适合本区域内的沟蚀研究。

Comparing three above methods , the method for deriving gully system parameters using aerial photo interpretation is the optimal method to assess gully erosion , as the gully density were taken as the key assessment factor .

据研究区域土壤侵蚀的特点及其影响因素，选取对土壤侵蚀影响较大的重要因子，包括坡度、植被覆盖度、降雨、沟壑密度和土壤抗冲刷强度等五个要素，作为水土流失评定的影响因子。

M2 . According to the features of target regions and its function factors , relative important factors , including slope gradient , vegetative cover , rainfall , gully density and soil anti-scourability were determined for soil and water loss evaluation .

黄土沟壑区指地表切割破碎、沟壑密度大、植被覆盖率低、水土流失严重的黄土山区。

Loess gully region that the surface is cutted broken , gully development , low vegetation cover , seriously soil and water loss .