| Title: | The impacts of land-use input conditions on flow and sediment discharge in the Dakbla Watershed, Central Highlands of Vietnam |
| Authors: | Tram, V.N.Q., H. Somura and T. Moroizumi |
| Year: | 2021 |
| Journal: | Water |
| Volume (Issue): | 13(5) |
| Pages: | |
| Article ID: | 627 |
| DOI: | 10.3390/w13050627 |
| URL (non-DOI journals): | |
| Model: | SWAT |
| Broad Application Category: | hydrologic and pollutant |
| Primary Application Category: | land use change assessment |
| Secondary Application Category: | sediment loss and transport |
| Watershed Description: | 3,507 km^2 Dakbla River, a tributary of the Sesan River (and larger Mekong River System) which drains parts of Kon Tum and Gia Lai Provinces in central Vietnam. |
| Calibration Summary: | |
| Validation Summary: | |
| General Comments: | |
| Abstract: | The main objective of this study was to evaluate various land-use input conditions in terms of the performance improvement found in consequent flow and sediment simulations. The soil and water assessment tool (SWAT) was applied to the Dakbla watershed from 2000 to 2018. After the calibration and validation processes, dissimilar effects between the input conditions on the flow and sediment simulations were confirmed. It was recognized that the impact of the land use on the sediment simulation was more sensitive than with the flow simulation. Additionally, through monthly evaluation, the effects against the flow and sediment in the rainy season were larger than those in the dry season, especially for sediment simulation in the last three months from October to December. Changing land-use conditions could improve flow and sediment simulation performance better than the performance found with static land-use conditions. Updated land-use inputs should be considered in simulations if the given land-use condition changes in a relatively short period because of frequent land-use policy changes by a local government. |
| Language: | English |
| Keywords: | land-use conversion; afforestation; deforestation; agricultural expansion; urbanization; mountainous areas; watershed modeling |