Spatial distribution and characteristics of the gullies in Caijiachuan watershed in loess region of Western Shanxi Province, China

被引：0
|
作者：
Zhao Y. [1 ]
Zhang J. [1 ,2 ,3 ,4 ]
Yu Y. [1 ,2 ]
Cui Y. [5 ]
Sun R. [1 ,6 ]
Li Y. [1 ]
Hu Y. [1 ]
机构：
[1] School of Soil and Water Conservation, Beijing Forestry University, Beijing
[2] Ji County Station in Shanxi, Chinese National Ecosystem Research Network
[3] Key Laboratory of State Forestry Administration on Soil and Water Conservation, Beijing Forestry University, Beijing
[4] Engineering Research Center of Forestry Ecological Engineering, Ministry of Education, Beijing Forestry University, Beijing
[5] National Science and Technology Infrastructure Centre, Beijing
[6] Department of Contemporary Agricultural Research, National Agricultural Exhibition Center (China Agricultural Museum), Beijing
来源：
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | 2022年 / 38卷 / 04期
关键词：
Gullies; QuickBird images; Remote sensing; Spatial distribution; The Loess Plateau; Topographical factors;
D O I：
10.11975/j.issn.1002-6819.2022.04.018
中图分类号：
学科分类号：
摘要：
A gully is one of the erosion geomorphic types in the Loess Plateau. Taking the Caijiachuan watershed in Ji County, the loess region of Western Shanxi in China as the object, this study aims to determine the spatial distribution and characteristics of cutting ditches using the QuickBird images and topographic mapping. A field investigation of 40 gullies was conducted to translate the 370 gullies in the watershed. An analysis was also made on the effects of topographic factors (such as slope, aspect, and elevation) on the spatial differentiation of the gully. The number, density, and frequency of erosion gullies were then calculated on the different topographic factors. The spatial variations of morphological and development indicators were determined, such as the erosion gullies area, length, morphological elements, gradient, Horizontal Proximity Index (HPI), Vertical Proximity Index (VPI), and Proximity Index of Variation (PIV). The main results are as follows: 1) The kernel density of the gully reached more than 8.23 in the northeast and southeast of the watershed, indicating a high concentration area. The kernel density of the gully was 4.11-8.23 in the middle dense area, which was located in the upper-middle reaches of the watershed; 2) The largest erosion was found in the gullies at the slope of 15-25°. The erosion gullies presented the maximum density and frequency when the slope range was between 5-15°. As such, the slope range of 5-25° was the most serious erosion for the drainage channel. According to the average of PIV, the vertical proximity index of the erosion gullies on the slope was greater than the horizontal proximity index as the slope level between 0-5°, 15-25°, 25-35°, 35-45°and more than 45°. The main type of erosion was the undercutting in these slope levels. Moreover, there were similar morphological characteristics of gullies on the slope of 25°-45°. 3) There were 66 erosion gullies in the northeast, which was the largest number in the study area. A minimum, 34 erosion gullies were located in the south. The maximum density of erosion gullies was 3.03 km/km2 in the north, whereas, the minimum density was 0.87 km/km2 in the east. The frequency of erosion gullies was significantly greater on the west side of the boundary line of 67.5°-247.50° in the slope direction than that on the east side. There were similar morphological characteristics of each gully on the west slope. 4) The altitude between 1 000 to 1 200 m was the most serious erosion of gully, indicating the highest density and frequency of erosion gullies. The PIV gradually approached zero, as the altitude increased from the altitude level of 1 000-1 100 m, but there were the negative average PIVs of all the altitude levels, where the main erosion type was undercutting. There were also similar morphological characteristics of the trenches below 1 100 m. Therefore, the key features were revealed in the mutual topography for the erosion gullies in the watershed. The finding can also provide a strong basis to manage the spatial distribution of erosion gullies in the small watersheds of the Loess areas. © 2022, Editorial Department of the Transactions of the Chinese Society of Agricultural Engineering. All right reserved.
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页码：151 / 158
页数：7
相关论文
共 31 条
  • [1] (2004)
  • [2] Li Liang, Study on Classification of Erosion Gully and Characteristics of Vegetation Restoration in Cai Jiachuan Watershed, (2018)
  • [3] He F, Wang T, Gu L, Et al., An integrated use of topography with RSI in gully mapping, Shandong Peninsula, China, Scientific World Journal, 2014, 5, (2014)
  • [4] Li Binbing, Huang Lei, Study on recognition of the gully in loess hilly gully region based on object-oriented technology, Research of Soil and Water Conservation, 20, 3, pp. 115-119, (2013)
  • [5] Qin Wei, Zhu Qingke, Zhao Leilei, Et al., Topographic characteristics of ephemeral gully erosion in loess hilly and gully region based on RS and GIS, Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 26, 6, pp. 58-64, (2010)
  • [6] Li J, Xiong L, Tang G., Combined gully profiles for expressing surface morphology and evolution of gully landforms, Frontiers of Earth Science, 13, 3, pp. 551-562, (2019)
  • [7] Du Guoming, Lei Guoping, Zong Xiaodan, Et al., Analysis on spatial pattern of gully erosion across typical black hilly region of northeast China, Research of Soil and Water Conservation, 18, 2, pp. 94-97, (2011)
  • [8] Huang Meng, Fan Haoming, Development characteristics and topographic differentiation features of erosion gully in Liaoning Province of China, Journal of Soil and Water Conservation, 31, 5, pp. 93-98, (2017)
  • [9] Tian Jian, Tang Guoan, Zhou Yi, Et al., Spatial variation of gully density in the Loess Plateau, Scientia Geographica Sinica, 33, 5, pp. 622-628, (2013)
  • [10] Zhao Y, Zhang B, Qin W, Et al., Primary environmental factors controlling gully distribution at the local and regional scale: An example from Northeastern China, International Soil and Water Conservation Research, 9, 1, pp. 58-68, (2021)
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