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Journal of Agriculture ›› 2022, Vol. 12 ›› Issue (5): 17-23.doi: 10.11923/j.issn.2095-4050.cjas2020-0097

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Terrain Factors Related to Hydrology in the Loess Plateau of Northern Shaanxi Based on DEM

WANG Yuanyuan()   

  1. Land Surveying, Planning and Design Institute of Shaanxi Provincial Land Engineering Construction Group, Xi’an 710075, Shaanxi, China
  • Received:2020-06-18 Revised:2020-08-27 Online:2022-05-20 Published:2022-06-06

Abstract:

Hydrological element is one of the significant factors in the study of soil erosion in the Loess Plateau. In order to reveal the correlation rules among the hydrological and topographic factors of the Loess Plateau in Northern Shaanxi, relevant hydrological and topographic factors were extracted based on the Shuttle Radar Topography Mission (SRTM) Digital Elevation Model (DEM) with 90m resolution, including slope length and slope gradient factor (LS), topographic wetness index (TWI), and gully density. Moreover, the three types of hydrological factors were analyzed. The TWI and the slope value showed the best index fitting performance with the R2 of 0.8168. The LS and the slope value showed the best quadratic polynomial fitting performance with the R2 of 0.993. The gully density and the slope value showed the best polynomial fitting performance with the R2 of 0.0604. The TWI and the LS showed the best index fitting performance with the R2 of 0.8385. The LS and the gully density showed the best quadratic polynomial fitting performance with the R2 of 0.2077. The TWI and the gully density showed the best polynomial fitting performance with the R2 of 0.2801. In conclusion, the condition of actual landform can be reflected by LS, TWI and gully density to a certain degree, and a significant linear correlation relationship can be found between the LS and the slope gradient. The slope gradient is inversely proportional to the TWI, and the gully density is inversely proportional to threshold of conflux value.

Key words: hydrological element, soil erosion, Loess Plateau in Northern Shaanxi, topographic mapping, slope length and slope gradient factor, gully density, topographic wetness index

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