The limits of watershed delineation: implications of different DEMs, DEM resolutions, and area threshold values
Identifying and demarcating watershed areas provides a basis for designing and planning for water resources. In this study, DEMs-based estimates of watershed characteristics of three rivers of Bangladesh – Halda, Sangu, and Chengi – were derived using eight Digital Elevation Models (DEMs) of 30 m, 9...
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| Format: | Article |
| Language: | English |
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IWA Publishing
2022-08-01
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| Series: | Hydrology Research |
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| Online Access: | http://hr.iwaponline.com/content/53/8/1047 |
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| author | Srijon Datta Shyamal Karmakar Symon Mezbahuddin Mohammad Mozaffar Hossain B. S. Chaudhary Md. Enamul Hoque M. M. Abdullah Al Mamun Tarit Kumar Baul |
| author_facet | Srijon Datta Shyamal Karmakar Symon Mezbahuddin Mohammad Mozaffar Hossain B. S. Chaudhary Md. Enamul Hoque M. M. Abdullah Al Mamun Tarit Kumar Baul |
| author_sort | Srijon Datta |
| collection | DOAJ |
| description | Identifying and demarcating watershed areas provides a basis for designing and planning for water resources. In this study, DEMs-based estimates of watershed characteristics of three rivers of Bangladesh – Halda, Sangu, and Chengi – were derived using eight Digital Elevation Models (DEMs) of 30 m, 90 m, and 225 m resolution in the Soil and Water Assessment Tool (SWAT). We have assessed watershed characteristics concerning DEMs, resolutions, and Area Threshold Values (ATVs). Though the elevation data differed, high correlation values among DEMs and resolutions confirm the negligible effect of elevation in the watershed delineation. However, the slope and watershed delineation vary for different DEMs and resolutions. The 90 m DEMs estimated larger areas for Halda and Chengi and lower perimeter values for all three rivers. In watershed delineation, the area near the mouth and flat terrain did not coincide with DEMs. The common intersected area by DEMs can be used as the focal area of watershed management. ATV ≤ 40 km2 significantly influences sub-basin counts and stream network extraction for these watershed areas. Though watershed size and shape were independent of the different ATVs, the DEM-based watershed delineation process in SWAT needs optimum ATV values to represent the stream network precisely.
HIGHLIGHTS
DEM source influences the slope, and DEM resolution affects the basin perimeter of a watershed.;
The flat terrain area influences watershed delineation.;
The sub-basin counts and stream network extraction should consider an optimum ATV value (here, ≤40 km2).;
The watershed size and shape were independent of the ATVs.;
The common intersected area, independent of the DEMs and resolutions, can be used as the watershed management area.; |
| first_indexed | 2024-04-12T04:39:25Z |
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| id | doaj.art-ce2cdbae5a934cc78ddd2bc9b6f59d84 |
| institution | Directory Open Access Journal |
| issn | 1998-9563 2224-7955 |
| language | English |
| last_indexed | 2024-04-12T04:39:25Z |
| publishDate | 2022-08-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Hydrology Research |
| spelling | doaj.art-ce2cdbae5a934cc78ddd2bc9b6f59d842022-12-22T03:47:43ZengIWA PublishingHydrology Research1998-95632224-79552022-08-015381047106210.2166/nh.2022.126126The limits of watershed delineation: implications of different DEMs, DEM resolutions, and area threshold valuesSrijon Datta0Shyamal Karmakar1Symon Mezbahuddin2Mohammad Mozaffar Hossain3B. S. Chaudhary4Md. Enamul Hoque5M. M. Abdullah Al Mamun6Tarit Kumar Baul7 Institute of Forestry and Environmental Sciences, University of Chittagong, Chattogram - 4331, Bangladesh Institute of Forestry and Environmental Sciences, University of Chittagong, Chattogram - 4331, Bangladesh Natural Resource Management Branch, Alberta Agriculture and Forestry, AB, Edmonton, Canada Institute of Forestry and Environmental Sciences, University of Chittagong, Chattogram - 4331, Bangladesh Department of Geophysics, Kurukshetra University, Kurukshetra, Haryana 136119, India Department of Oceanography, University of Chittagong, Chattogram - 4331, Bangladesh Institute of Forestry and Environmental Sciences, University of Chittagong, Chattogram - 4331, Bangladesh Institute of Forestry and Environmental Sciences, University of Chittagong, Chattogram - 4331, Bangladesh Identifying and demarcating watershed areas provides a basis for designing and planning for water resources. In this study, DEMs-based estimates of watershed characteristics of three rivers of Bangladesh – Halda, Sangu, and Chengi – were derived using eight Digital Elevation Models (DEMs) of 30 m, 90 m, and 225 m resolution in the Soil and Water Assessment Tool (SWAT). We have assessed watershed characteristics concerning DEMs, resolutions, and Area Threshold Values (ATVs). Though the elevation data differed, high correlation values among DEMs and resolutions confirm the negligible effect of elevation in the watershed delineation. However, the slope and watershed delineation vary for different DEMs and resolutions. The 90 m DEMs estimated larger areas for Halda and Chengi and lower perimeter values for all three rivers. In watershed delineation, the area near the mouth and flat terrain did not coincide with DEMs. The common intersected area by DEMs can be used as the focal area of watershed management. ATV ≤ 40 km2 significantly influences sub-basin counts and stream network extraction for these watershed areas. Though watershed size and shape were independent of the different ATVs, the DEM-based watershed delineation process in SWAT needs optimum ATV values to represent the stream network precisely. HIGHLIGHTS DEM source influences the slope, and DEM resolution affects the basin perimeter of a watershed.; The flat terrain area influences watershed delineation.; The sub-basin counts and stream network extraction should consider an optimum ATV value (here, ≤40 km2).; The watershed size and shape were independent of the ATVs.; The common intersected area, independent of the DEMs and resolutions, can be used as the watershed management area.;http://hr.iwaponline.com/content/53/8/1047catchmentdem resolutionhydrological modelnetworkstreamswat |
| spellingShingle | Srijon Datta Shyamal Karmakar Symon Mezbahuddin Mohammad Mozaffar Hossain B. S. Chaudhary Md. Enamul Hoque M. M. Abdullah Al Mamun Tarit Kumar Baul The limits of watershed delineation: implications of different DEMs, DEM resolutions, and area threshold values Hydrology Research catchment dem resolution hydrological model network stream swat |
| title | The limits of watershed delineation: implications of different DEMs, DEM resolutions, and area threshold values |
| title_full | The limits of watershed delineation: implications of different DEMs, DEM resolutions, and area threshold values |
| title_fullStr | The limits of watershed delineation: implications of different DEMs, DEM resolutions, and area threshold values |
| title_full_unstemmed | The limits of watershed delineation: implications of different DEMs, DEM resolutions, and area threshold values |
| title_short | The limits of watershed delineation: implications of different DEMs, DEM resolutions, and area threshold values |
| title_sort | limits of watershed delineation implications of different dems dem resolutions and area threshold values |
| topic | catchment dem resolution hydrological model network stream swat |
| url | http://hr.iwaponline.com/content/53/8/1047 |
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