Comparison of Methods for Determining Catchment Area Threshold for Water System Extraction
Most of the methods using digital elevation models (DEM) to extract water systems require the determination of catchment area thresholds.For a better understanding of the rationality and applicability of several commonly used determination methods of the catchment area threshold for water system ext...
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Editorial Office of Pearl River
2023-01-01
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| Series: | Renmin Zhujiang |
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| Online Access: | http://www.renminzhujiang.cn/thesisDetails#10.3969/j.issn.1001-9235.2023.01.015 |
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| author | ZHENG Jiawei CHEN Xingwei LI Xiaocheng RUAN Weifang |
| author_facet | ZHENG Jiawei CHEN Xingwei LI Xiaocheng RUAN Weifang |
| author_sort | ZHENG Jiawei |
| collection | DOAJ |
| description | Most of the methods using digital elevation models (DEM) to extract water systems require the determination of catchment area thresholds.For a better understanding of the rationality and applicability of several commonly used determination methods of the catchment area threshold for water system extraction,the distance error between the real river source and the extracted one is used as a criterion to determine the rationality of the real water system extraction methods.Four main methods,namely,the drainage density method,the water-system fractal dimension method,the method of the minimum error at the river source,and the channel branching ratio method,are selected,and the Jinjiang River Basin on the southeast coast is taken as an example.The distance errors between the extracted river sources by different methods and the real river sources are compared.The results show that the visual discrimination of the catchment area threshold used by the drainage density method,water-system fractal dimension method,and channel branching ratio method has a large uncertainty,and the distance errors are large.In the method of the minimum error at the river source,the catchment area threshold is determined according to the minimum distance error between the extracted river source and the real one,which is unique.Hence,it is a more reasonable method among the four DEM-based real water system extraction methods. |
| format | Article |
| id | doaj-art-56c27206e2dd4f7c89b3411a3cc9d2b5 |
| institution | Kabale University |
| issn | 1001-9235 |
| language | zho |
| publishDate | 2023-01-01 |
| publisher | Editorial Office of Pearl River |
| record_format | Article |
| series | Renmin Zhujiang |
| spelling | doaj-art-56c27206e2dd4f7c89b3411a3cc9d2b52025-01-15T02:22:58ZzhoEditorial Office of Pearl RiverRenmin Zhujiang1001-92352023-01-014447640701Comparison of Methods for Determining Catchment Area Threshold for Water System ExtractionZHENG JiaweiCHEN XingweiLI XiaochengRUAN WeifangMost of the methods using digital elevation models (DEM) to extract water systems require the determination of catchment area thresholds.For a better understanding of the rationality and applicability of several commonly used determination methods of the catchment area threshold for water system extraction,the distance error between the real river source and the extracted one is used as a criterion to determine the rationality of the real water system extraction methods.Four main methods,namely,the drainage density method,the water-system fractal dimension method,the method of the minimum error at the river source,and the channel branching ratio method,are selected,and the Jinjiang River Basin on the southeast coast is taken as an example.The distance errors between the extracted river sources by different methods and the real river sources are compared.The results show that the visual discrimination of the catchment area threshold used by the drainage density method,water-system fractal dimension method,and channel branching ratio method has a large uncertainty,and the distance errors are large.In the method of the minimum error at the river source,the catchment area threshold is determined according to the minimum distance error between the extracted river source and the real one,which is unique.Hence,it is a more reasonable method among the four DEM-based real water system extraction methods.http://www.renminzhujiang.cn/thesisDetails#10.3969/j.issn.1001-9235.2023.01.015digital elevation modelwater system extractionriver sourcecatchment areathreshold |
| spellingShingle | ZHENG Jiawei CHEN Xingwei LI Xiaocheng RUAN Weifang Comparison of Methods for Determining Catchment Area Threshold for Water System Extraction Renmin Zhujiang digital elevation model water system extraction river source catchment area threshold |
| title | Comparison of Methods for Determining Catchment Area Threshold for Water System Extraction |
| title_full | Comparison of Methods for Determining Catchment Area Threshold for Water System Extraction |
| title_fullStr | Comparison of Methods for Determining Catchment Area Threshold for Water System Extraction |
| title_full_unstemmed | Comparison of Methods for Determining Catchment Area Threshold for Water System Extraction |
| title_short | Comparison of Methods for Determining Catchment Area Threshold for Water System Extraction |
| title_sort | comparison of methods for determining catchment area threshold for water system extraction |
| topic | digital elevation model water system extraction river source catchment area threshold |
| url | http://www.renminzhujiang.cn/thesisDetails#10.3969/j.issn.1001-9235.2023.01.015 |
| work_keys_str_mv | AT zhengjiawei comparisonofmethodsfordeterminingcatchmentareathresholdforwatersystemextraction AT chenxingwei comparisonofmethodsfordeterminingcatchmentareathresholdforwatersystemextraction AT lixiaocheng comparisonofmethodsfordeterminingcatchmentareathresholdforwatersystemextraction AT ruanweifang comparisonofmethodsfordeterminingcatchmentareathresholdforwatersystemextraction |