东北黑土区侵蚀沟危害面积识别研究

doi:10.16843/j.sswc.2018.06.004

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Abstract [Background] The black soil area of the Northeast China is an important grain production area and the largest commercial grain production base in China, but the soil texture is loose and the corrosion resistance is poor. Under the driving force of hydraulic erosion, the sheet erosion of a slope-land would develop to a gully on the depression area in the watershed. The First National Water Conservancy Survey (2010) showed that there were more than 295 700 gullies of over 100 meters in the black soil area of northeast China, covering an area of 3 648 km². At present, the gully erosion has been seriously deteriorated, and large-scale control is urgently needed in the black soil region of Northeast China. However, research on the area protected by gully erosion control is extremely scarce, and it had brought great difficulty to government departments in decision-making, gully erosion prevention planning, and evaluation of gully erosion mitigation effectiveness.[Methods] Therefore, based on the characteristics of occurrence and development of gullies, this paper defined the potential catchment area as an important part of its damaged area of gully erosion, thus that damaged scope of a gully not only included the current spatial impact of gully erosion, but also reflected the future development of gully damaged area at temporal scale. On the basis of gullies data in the black soil area of Northeast China from the First National Water Conservancy Survey and digital elevation model (DEM) with 30 m precision, GIS spatial analysis technology was comprehensively used to determine the current and the potential catchment boundary of some gullies in the black soil region.[Results] Based on the 10 m precision DEM, the average error of 460 gullies catchment area was about ±16.04%. The identification error of catchment area for large gullies was small. The difference among the damaged areas of different types of gullies was significant. The damaged area of large-size gullies was significantly larger than that of small-and medium-size gullies, but the latter accounted for a very high proportion of potential damaged area. Small-and medium-size gullies should be considered as prior control in the black soil area in future, so as to effectively increase the cost-effectiveness of investment in protection projects. The length of the gullies was more related to its damaged area than their covering area.[Conclusions] Catchment area is defined as the damaged area of a gully, reflecting the influence of the gullies on different spatial scale areas (direct impact area, indirect influence area, and catchment area), and charactering the development of gullies on the long-term scale (the current catchment area and the potential catchment area). The method of identifying gully damaged area had moderate data accuracy requirements. The 30m DEM data was coupled with vector gullies data from the First-ever Nationwide Water Resources Survey, and the needs of identifying the catchment boundaries of erosive gullies are met.

Key words： black soil region in Northeast China gully catchment area spatial and temporal scale

Received: 24 April 2018

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S157

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	Articles by authors
	OU Yang
	YAN Baixing
	BAI Jianhong
	CHEN Haosheng
	GAO Yuan
	LI Rongxuan
	GAO Yan
	ZHANG Yanling
	CUI Hu

Cite this article:

OU Yang,YAN Baixing,BAI Jianhong, et al. Identifying the damaged area of gully in black soil region of Northeast China[J]. SSWC, 2018, 16(6): 24-30.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2018.06.004 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2018/V16/I6/24

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