Calculation of watershed flow concentration based on the grid drop concept
The grid drop concept is introduced and used to develop a micromechanism-based methodology for calculating watershed flow concentration. The flow path and distance traveled by a grid drop to the outlet of the watershed are obtained using a digital elevation model (DEM). Regarding the slope as an une...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2008-03-01
|
| Series: | Water Science and Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674237015300132 |
| _version_ | 1819195054818852864 |
|---|---|
| author | Rui Xiaofang Yu Mei Liu Fanggui Gong Xinglong |
| author_facet | Rui Xiaofang Yu Mei Liu Fanggui Gong Xinglong |
| author_sort | Rui Xiaofang |
| collection | DOAJ |
| description | The grid drop concept is introduced and used to develop a micromechanism-based methodology for calculating watershed flow concentration. The flow path and distance traveled by a grid drop to the outlet of the watershed are obtained using a digital elevation model (DEM). Regarding the slope as an uneven carpet through which the grid drop passes, a formula for overland flow velocity differing from Manning's formula for stream flow as well as Darcy's formula for pore flow is proposed. Compared with the commonly used unit hydrograph and isochronal methods, this new methodology has outstanding advantages in that it considers the influences of the slope velocity field and the heterogeneity of spatial distribution of rainfall on the flow concentration process, and includes only one parameter that needs to be calibrated. This method can also be effectively applied to the prediction of hydrologic processes in un-gauged basins. |
| first_indexed | 2024-12-23T02:06:40Z |
| format | Article |
| id | doaj.art-9f23daafb67a404d92fc55a7921a6366 |
| institution | Directory Open Access Journal |
| issn | 1674-2370 |
| language | English |
| last_indexed | 2024-12-23T02:06:40Z |
| publishDate | 2008-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Water Science and Engineering |
| spelling | doaj.art-9f23daafb67a404d92fc55a7921a63662022-12-21T18:03:53ZengElsevierWater Science and Engineering1674-23702008-03-01111910.1016/S1674-2370(15)30013-2Calculation of watershed flow concentration based on the grid drop conceptRui Xiaofang0Yu Mei1Liu Fanggui2Gong Xinglong3State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, P. R. ChinaState Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, P. R. ChinaState Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, P. R. ChinaState Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, P. R. ChinaThe grid drop concept is introduced and used to develop a micromechanism-based methodology for calculating watershed flow concentration. The flow path and distance traveled by a grid drop to the outlet of the watershed are obtained using a digital elevation model (DEM). Regarding the slope as an uneven carpet through which the grid drop passes, a formula for overland flow velocity differing from Manning's formula for stream flow as well as Darcy's formula for pore flow is proposed. Compared with the commonly used unit hydrograph and isochronal methods, this new methodology has outstanding advantages in that it considers the influences of the slope velocity field and the heterogeneity of spatial distribution of rainfall on the flow concentration process, and includes only one parameter that needs to be calibrated. This method can also be effectively applied to the prediction of hydrologic processes in un-gauged basins.http://www.sciencedirect.com/science/article/pii/S1674237015300132micromechanisms of watershed flow concentrationgrid dropoverland flow velocity formulaspatial velocity fieldwatershed runoff concentration timedigital elevation model |
| spellingShingle | Rui Xiaofang Yu Mei Liu Fanggui Gong Xinglong Calculation of watershed flow concentration based on the grid drop concept Water Science and Engineering micromechanisms of watershed flow concentration grid drop overland flow velocity formula spatial velocity field watershed runoff concentration time digital elevation model |
| title | Calculation of watershed flow concentration based on the grid drop concept |
| title_full | Calculation of watershed flow concentration based on the grid drop concept |
| title_fullStr | Calculation of watershed flow concentration based on the grid drop concept |
| title_full_unstemmed | Calculation of watershed flow concentration based on the grid drop concept |
| title_short | Calculation of watershed flow concentration based on the grid drop concept |
| title_sort | calculation of watershed flow concentration based on the grid drop concept |
| topic | micromechanisms of watershed flow concentration grid drop overland flow velocity formula spatial velocity field watershed runoff concentration time digital elevation model |
| url | http://www.sciencedirect.com/science/article/pii/S1674237015300132 |
| work_keys_str_mv | AT ruixiaofang calculationofwatershedflowconcentrationbasedonthegriddropconcept AT yumei calculationofwatershedflowconcentrationbasedonthegriddropconcept AT liufanggui calculationofwatershedflowconcentrationbasedonthegriddropconcept AT gongxinglong calculationofwatershedflowconcentrationbasedonthegriddropconcept |