[1]ZHENG Wei,GAO Huanlin,ZHANG Minghao,et al.Study on Methods of Determining Optimal Catchment Area Threshold in Zhifanggou Catchment[J].Research of Soil and Water Conservation,2020,27(05):67-71.
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Study on Methods of Determining Optimal Catchment Area Threshold in Zhifanggou Catchment
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 05
Page number:
67-71
Column:
目次
Public date:
2020-08-20
- Title:
- Study on Methods of Determining Optimal Catchment Area Threshold in Zhifanggou Catchment
- CLC:
- P333
- DOI:
- -
- Abstract:
- In order to determine the optimal catchment area threshold of catchment accurately, 30 m DEM of Zhifanggou Catchment located in Ansai County of Shaanxi Province was taken as the example. And the mean change point analysis method was used to analyze the relationships between catchment fractal dimension, DEM resolution and catchment area threshold. The results show that:(1)the relationship between the catchment area threshold and fractal dimension presents that the fractal dimension value increases first and then decreases and its rate of decline changes from rapidness to slowness with the increase of the catchment area threshold under different resolutions of DEM;(2)the relationship between DEM resolution and fractal dimension value indicates that the fractal dimension value tends to decrease as a whole and its rate of decrease is getting slower and slower with the decrease of DEM resolution under the threshold of optimal water catchment area;(3)the box fractal dimension of the drainage system of the Zhifanggou catchment is 1.20, the corresponding value of optimal catchment area threshold and the optimal DEM resolution are 100 m and 15 m, respectively; the mean change point analysis method is more accurate and reliable for determining the optimal catchment area threshold and the optimal DEM resolution and decision coefficient reaches up to 0.99. These research results can provide the references for determining the optimal catchment area threshold of other river network water system extraction.
- References:
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Last Update:
2020-08-25