doi:

DOI: 10.3724/SP.J.1047.2013.00871

Journal of Geo-information Science (地球信息科学学报) 2013/15:6 PP.871-878

Inter-watershed and Its Automatic Extraction Based on DEMs


Abstract:
Watershed delineation based on DEMs in the GIS environment is a fundamental work for hydrological analysis. But the feature difference between normal and inter-watershed watershed has long been ignored. This text believes that existence of inter-watershed must be taken into account during watershed delineation and analysis. In this paper, an overall explanation of basic concepts and characteristics of inter-watershed is presented, and a method of extracting inter-watershed automatically based on DEMs is introduced. Experimental results in the Loess Plateau region show that inter-watershed could be extracted accurately and quickly after a comprehensive consideration of water accumulation threshold, terrain feature and the boundary of data. Generally speaking, flat topography may lead to the wrong position of outlets of watersheds, which can be corrected with help of rivers' DLG data. And if boundary of the data is not the dividing crest, it's difficult to determine whether a watershed whose dividing line consists of data's boundary is inter-watershed or not. Comparison of inter-watershed and normal watershed in terms of spatial form, spatial distribution and hydrological characteristics based on experimental results show that inter-watershed performs notable features. Firstly, spatial pattern of inter-watershed is clump and tends towards stability with growing minimum catchment area settled. Secondly, the amount of inter-watershed depend on the number of runoff node that means that it has a power function with minimum catchment area in the test area. And a good linear relation between average area of inter-watershed and average area of normal watershed could be found in the experiments. Thirdly, spatial shapes of inter-watershed make it collect water quickly if threshold value is settled larger than 0.4 km2 based on the statistic of shape index of the inter-watersheds extracted in the experiment area. In conclusion, the concept of inter-watershed is defined firstly and its basic characteristics are also interpreted. The method introduced contributes to ensure the correctness of watershed delineation. The study on inter-watershed is of great significance not only in fluvial geomorphology research but also the theories and methods of digital terrain analysis.

Key words:watershed delineation,inter-watershed,DEM

ReleaseDate:2015-04-17 13:34:31



[1] 陆中臣.流域地貌系统[M].大连:大连出版社, 1991.

[2] Aksoy H, Kavvas M L. A review of hillslope and watershed scale erosion and sediment transport models[J]. Catena, 2005, 64(2):247-271.

[3] 陈刚, 张兴奇, 李满春.M IKE BASIN支持下的流域水文建模与水资源管理分析——以西藏达孜县为例[J].地球信息科学, 2008, 10(2):230-236.

[4] 刘兆存, 金生, 韩丽华.国内流域产汇流模型与应用分析[J].地球信息科学, 2007, 9(3):96-103.

[5] 松财, 孙朝阳.中国流域的SRTM30数据提取与计算[J].地球信息科学, 2009, 11(2):191-195.

[6] Lin W T, Chou W C, Lin C Y, et al. WinBasin: Using improved algorithms and the GIS technique for automated watershed modelling analysis from digital elevation models[J]. International Journal of Geographical Information Science, 2008, 22(1):47-69.

[7] 闾国年, 钱亚东.流域地形自动分割研究[J].遥感学报, 1998, 2(4):298-304.

[8] Strahler A N. Hypsometric (area-altitude) analysis of erosional topography[J]. Geological Society of America Bulletin, 1952, 63(11):1117-1142.

[9] Furnans J E, Maidment D R. Topologic navigation and the Pfafstetter system[D]. Austin: University of Texas, 2010.

[10] Yang D, Musiake K, Kanae S, et al. Use of the Pfafstetter basin numbering system in hydrological modeling[R]. Proceedings of 2000 Annual Conference, Japan Society of Hydrology and Water Resources, 2000.

[11] Shreve R L. Infinite topologically random channel networks[J]. The Journal of Geology, 1967, 75(2):178-186.

[12] 承继成, 江美球.流域地貌数学模型[M].北京:科学出版社, 1986.

[13] 汤国安, 刘学军, 闾国年.数字高程模型及地学分析的原理与方法[M].北京:科学出版社, 2005.

[14] 张婷.基于DEM的流域沟谷网络尺度特征及尺度分解[M].南京:南京师范大学, 2008.

[15] 邬建国.景观生态学—概念与理论[J].生态学杂志, 2000, 19(1):42-52.

[16] Horton R E. Sheet erosion-present and past[J]. Trans. Am. Geophys. Union, 1941(22):299-305.

[17] 汤国安, 杨昕.ArcGIS地理信息系统空间分析实验教程[M].北京:科学出版社, 2006.

[18] O'Callaghan J F and Mark D M. The extraction of drainage networks from digital elevation data[J]. Computer Vision, Graphics, and Image Processing, 1984, 28(3):323-344.

[19] 李俊, 汤国安, 张婷, 等.利用DEM提取陕北黄土高原沟谷网络的汇流阈值研究[J].水土保持通报, 2007, 27(2):75-78.

[20] 祝士杰, 汤国安, 贾旖旎.基于DLG水系的DEM修正方法研究[J].现代测绘, 2009, 32(6):3-4.