| This article has been：Browse 1677Times Download 2775Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.20180259 |
|
| Using SWAT and CLUE-S Models to Evaluate the Effect of Land Use on Drainage Modules |
|
LI Na, WANG Xiugui, LUO Qiang, WANG Shuhai, KE Zhigang
|
|
1. National Key Laboratory of Water Resources and Hydropower Engineering Science of Wuhan University, Wuhan 430072, China; 2. Jiangxi Agricultural University, Nanchang 330045, China; 3. Jingzhou Water Conservancy Bureau, Jingzhou 434020, China
|
| Abstract: |
| 【Objective】Change in land use could alert water movement in a catchment and this paper studies its impact on drainage modules using the SWAT and CLUE-S models in order to optimize catchment management.【Method】The study focused on Luoshan drainage area in the Four-lake Watershed in Hubei province. The watershed hydrologic model SWAT was combined with the land use change model CLUE-S to analyze the effect of different land uses on drainage modules in this area. We considered six ratios of paddy-field area to dryland area, five water surface ratios and five urbanization ratios, and studied how the drainage modules respond to change in one single factor by keeping other factors unchanged. We used the CLUE-S model to simulate the land use variation under each scenario, and the SWAT model to simulate the associated runoff and the effect of land use on drainage modules. 【Result】Under the same rainstorm with other factors remaining the same, when the ratio of paddy field area to dryland area increased from 0 to 1 the drainage modulus decreased by 0.117 m3/（s·km2）, while when the water surface ratio increased from 0 to 20% the drainage modulus decreased by 0.111 m3/（s·km2）. Increasing the urbanization ratio from 0 to 10% reduced the drainage modulus by 0.104 m3/（s·km2）. The drainage modulus decreased as the ratio of paddy field area to dryland area or water surface ratio increased, but increased with urbanization ratio. Under the same rainstorm with other factors remaining the same as they are, ① increasing the ratio of paddy field area to dryland area from 0 to 0.2 decreased the drainage modulus by 3.06%; ②increasing the water surface ratio from 0 to 10% decreased the drainage modulus by 14.03%; ③ increasing the urbanization ratio from 0 to 10% increased the drainage modulus by 16.67%. Among all three land use changes, the drainage module is more sensitive to change in water surface ratio and urbanization ratio.【Conclusion】The drainage pressure could be alleviated by increasing paddy field area or water surface area or limiting urban expansion, with increasing water surface area and limiting urban expansion being more effective. |
| Key words: SWAT model; CLUE-S model; drainage modulus; land use |
|
|
