[1]QIAO Bingjie,YANG Qinke,WANG Chunmei,et al.Influence of Terrace on Erosional Topographic Index[J].Research of Soil and Water Conservation,2023,30(04):184-193.[doi:10.13869/j.cnki.rswc.2023.04.018.]
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Influence of Terrace on Erosional Topographic Index
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 04
Page number:
184-193
Column:
Public date:
2023-06-10
- Title:
- Influence of Terrace on Erosional Topographic Index
- Keywords:
- terrace; high-resolution DEM; terrain factor; specific catchment area; topographic wetness index
- CLC:
- S157
- DOI:
- 10.13869/j.cnki.rswc.2023.04.018.
- Abstract:
- [Objective] The aims of this study are to explore the impact of artificial terrain(terraces)on topographic indicators, analyze the impact of building terraces on soil erosion process, and provide scientific basis for the determination of terraces measures in soil erosion assessment. [Methods] The high-resolution DEM data of Zhifanggou watershed were obtained through UAV aerial photogrammetry. Through simulating the original slope surface and constructing horizontal terraces, slope, slope length, slope length and steepness factor(LS), specific catchment area(SCA)and topographic wetness index(TWI)from these data were extracted, and the changes of these factors were analyzed to understand the impact of terraces on erosional terrain. [Results](1)The construction of terraces reduced the slope, cut off the slope length and decreased the LS factor. With the increase of terrace area ratio, slope, slope length and LS factor all showed a decreasing trend. In the terraced area, the slope, slope length and LS factors were roughly distributed along the contour line in a strip; in the non-terraced area, the slope, slope length and LS factors gradually increased from the water dividing line downward, and then gradually slowed down to the valley bottom.(2)The construction of terraces reduced the SCA and increased the TWI. The spatial pattern of SCA was similar to that of slope length, the value was smaller in the higher part, and was larger in the lower part. The spatial distribution pattern of TWI in terraces was opposite to that of slope, and the spatial distribution pattern of TWI in non-terraces was similar to that of SCA.(3)At the micro scale, the slope length, LS factor, SCA and TWI all tended to increase in the direction of slope decline of the field surface. When constructing or maintaining the terraces, the field surface should be kept as horizon as possible or a slight reverse slope.(4)According to the influence of terraces on the LS factor, the engineering measure factor value of terraces in the study area should be taken as 0.26～0.37. [Conclusion] The construction of terraces has a great contribution to soil and water conservation in the hilly areas of the Loess Plateau, and can provide a reference for the construction of terraces and soil erosion assessment in the hilly areas of the Loess Plateau.
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Last Update:
2023-06-10