| This article has been：Browse 1326Times Download 1213Times |
scan it! |
|
|
| DOI：10.13522/j.cnki.ggps.2017.0546 |
|
| Optimizing Land Usage in Southern Mountain Areas of Jinan Based on the SWAT Model |
|
FENG Baoping, LIANG Xing, ZENG Zhuo
|
|
Hohai University, Nanjing 210098, China
|
| Abstract: |
| 【Objective】 The discharge of water and sediments in a catchment is impacted by its land use and the objective of this paper is to investigate the feasibility of changing land usage to improve water cycling and functions in Southern Mountain Region with a view to make the City of Jinan more ecologically sustainable. 【Method】 We first simulated the response of runoff and sediment transport to land use change using the SWAT model at spatial resolution of 20 km2; the accuracy of the model was assessed by index Re, Ens and R2. We then developed a multi-objective optimization model for land use by minimizing the runoff and sediment discharge and maximizing economic benefit. 【Result】① The three indexes, Re, Ens and R2 were satisfactory, indicating that SWAT was capable of simulating runoff and sediment in this region. ②The dependence of runoff and sediment discharge on change of land use within a unit area could be described by a quadratic function. While converting forest to building sites increased runoff and sediment discharge, the impact of converting grassland to building sites and cropland was limited. ③ In terms of reducing runoff and sediment discharge, the optimal areas for forest, pasture, cropland and land for buildings in this region were 370.70 km2, 158.35 km2, 375.92 km2 and 45.21 km2 respectively. 【Conclusion】 The results calculated using the optimization model in this paper can help improve land usage, protect ecological environment and ensure sustainability of the City of Jinan. |
| Key words: southern mountain area; SWAT model; land usage; multi-objective optimization |
|
|
