基于GIS的斜坡单元划分方法改进与实现
An Approach to Improving Slope Unit Division Using GIS Technique
查看参考文献25篇
文摘
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斜坡单元已广泛应用于滑坡易发性制图和地质灾害评价。然而在山间盆地或大型宽谷处,常规方法划分出的斜坡单元与地貌背景难以匹配。依据高程及其衍生变量的基本形态系统和曲率的流域分割原理,基于Arc- GIS技术,通过叠加曲率和反转曲率的流域边界,改进了斜坡单元划分方法。结果表明:与常规方法相比,改进方法不仅能够使用山脊线和山谷线以划分斜坡单元,还能利用台地边界和宽谷边界以分割水平地表与倾斜地表;划分出的单元大小相对均匀,单元形状总体介于圆形和正三角形之间。对于水平成分较多的地区,如黄土塬区和水库库区,该方法与传统方法相比,具有较好的应用前景。 |
其他语种文摘
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In recent years, slope units have been widely utilized in landslide susceptibility mapping and geological hazard assessment. Slope units automatically derived from high-quality DTMs, partition the territory into hydrological regions between drainage and divide lines. The division method of slope units conducts subwatershed segmentation on elevation and the reversal to extract ridge lines and valley lines, then overlays these terrain feature lines. However, these resultant units are unable to match with geomorphology background where intermountain basins or large open valleys exist. In this article, according to the basic morphometic system of elevation and the derived variables, slope is derivative of elevation while curvature is that of slope, thus the break of slope should be indicated by curvature instead of elevation. The disability of indicating variation of slope is regarded as the main reason for the limitation in the conventional method. According to the theory of watershed segmentation of mean curvature, the division method of slope units is improved by overlaying watershed boundaries on curvature and the reversal in ArcGIS. Firstly, the DEM should be smoothed twice with a 5×5 average filter in order to reduce the effect of noise and small scale variation in the DEM. The curvature is then calculated from the filtered DEM using the Arctool named Curvature. After that, watershed boundaries are generated mainly through computing flow direction, scouting sink and dividing watershed in the curvature image, and this image should be reversed for watershed boundaries on the reversal curvature. Finally, slope units can be separated from each other by these two kinds of boundaries which are further combined into the boundaries of slope units. Giving an example from Huachi County of Gansu Province, elevation layer in the resolution of 20 m was used as input data, and both two methods were then applied for slope unit division. Compared with the conventional method, the revised approach not only uses ridge lines and valley lines to segment slope units, but also utilizes tableland boundaries and open valley boundaries to separate horizontal surface from the inclined. The revised approach may give a new definition that slope units should be divided by ridge lines, valley lines, tableland boundaries and open valley boundaries. Also the revised method utilizes watershed segmentation on curvature instead of subwatershed division on DEM where filling sinks perhaps causes the serious change of reversal elevation. Furthermore, the resultant units have relatively uniform size and shape, more than 80% of them with the area from 0.1×10~4 to 6×10~4m~2 and about 60% between circle and triangle shape, which are more suitable for landslide hazard evaluation. It is worth mentioning that the revised method would be more competitive than the original in some regions with large area of horizontal surface, just like Loess Tableland and reservoir surface. |
来源
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地理科学
,2017,37(11):1764-1770 【核心库】
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DOI
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10.13249/j.cnki.sgs.2017.11.019
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关键词
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斜坡单元
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划分方法
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平均曲率
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流域分割
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ArcGIS
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地址
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兰州大学土木工程与力学学院地质工程系, 西部灾害与环境力学教育部重点实验室, 甘肃, 兰州, 730000
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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1000-0690 |
学科
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地质学;自然地理学;自动化技术、计算机技术 |
基金
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国家973计划
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国家自然科学基金
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文献收藏号
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CSCD:6127463
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参考文献 共
25
共2页
|
1.
He Sanwei. Application of kernelbased Fisher discriminant analysis to map landslide susceptibility in the Qinggan River delta, Three Gorges, China.
Geomorphology,2012,171:30-41
|
被引
10
次
|
|
|
|
2.
Hadji R. Geologic, topographic and climatic controls in landslide hazard assessment using GIS modeling: A case study of Souk Ahras region, NE Algeria.
Quaternary International,2013,302:224-237
|
被引
5
次
|
|
|
|
3.
Hansen A. Landslide hazard analysis.
Slope Instability,1984:523-602
|
被引
12
次
|
|
|
|
4.
Guzzetti F. Landslide hazard evaluation: a review of current techniques and their application in a multi-scale study, Central Italy.
Geomorphology,1999,31(1/4):181-216
|
被引
145
次
|
|
|
|
5.
Xie M. Spatial three-dimensional landslide susceptibility mapping tool and its applications.
Earth Science Frontiers,2007,14(6):73-84
|
被引
4
次
|
|
|
|
6.
Jia Ning. Shallow landslide hazard assessment using a three-dimensional deterministic model in a mountainous area.
Computers and Geotechnics,2012,45:1-10
|
被引
10
次
|
|
|
|
7.
霍艾迪. 地质灾害易发性评价单元划分方法以陕西省黄陵县为例.
吉林大学学报:地球科学版,2011,41(2):523-528,535
|
被引
8
次
|
|
|
|
8.
程温鸣. 基于粗糙集理论的滑坡易发性评价--以三峡库区秭归县境内为例.
中南大学学报:自然科学版,2013,44(3):1083-1090
|
被引
17
次
|
|
|
|
9.
武雪玲. 斜坡单元支持下的滑坡易发性评价支持向量机模型.
武汉大学学报:信息科学版,2013,38(12):1499-1503
|
被引
23
次
|
|
|
|
10.
薛强. 基于斜坡单元与信息量法结合的宝塔区黄土滑坡易发性评价.
地质通报,2015,34(11):2108-2115
|
被引
22
次
|
|
|
|
11.
王佳佳. 基于GIS考虑准动态湿度指数的滑坡危险性预测水文--力学耦合模型研究.
岩石力学与工程学报,2013,32(S2):3868-3877
|
被引
6
次
|
|
|
|
12.
谷天峰. 基于斜坡单元的区域斜坡稳定性评价方法.
地理科学,2013,33(11):1400-1405
|
被引
17
次
|
|
|
|
13.
Krcho J.
Morphometric analysis of relief on the basis of geometric aspect of field theory,1973
|
被引
1
次
|
|
|
|
14.
Evans I S. General geomorphometry, derivatives of altitude, and descriptive statistics.
Spatial Analysis in Geomorphology,1972:17-90
|
被引
8
次
|
|
|
|
15.
Minar J. Morfometricka analyza poli a jej vyuzitie v geoekologii.
Geograficky casopis,1999,51(3):261-277
|
被引
1
次
|
|
|
|
16.
Shary P A. Fundamental quantitative methods of land surface analysis.
Geoderma,2002,107(1/2):1-32
|
被引
38
次
|
|
|
|
17.
Shary P A. Land surface in gravity points classification by a complete system of curvatures.
Mathematical Geology,1995,27(3):373-390
|
被引
9
次
|
|
|
|
18.
Shary P A. The problem of scale-specific and scale-free approaches in geomorphometry.
Geografia Fisica e Dinamica Quaternaria,2005,28(1):81-101
|
被引
1
次
|
|
|
|
19.
Romstad B. Structuring the digital elevation model into landform elements through watershed segmentation of curvature.
Proceedings of Geomorphometry,2009:55-60
|
被引
1
次
|
|
|
|
20.
Romstad B. Mean-curvature watersheds: A simple method for segmentation of a digital elevation model into terrain units.
Geomorphology,2012,139:293-302
|
被引
5
次
|
|
|
|
|