Relative Importance of Land Use and Climate Change on Hydrology in Agricultural Watershed of Southern China
| Autor: | Gaoling Zhang, Lanhua Luo, Liangxia Duan, Hong S. He, Qing Zhou, Hongxia Xie |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
land use change
010504 meteorology & atmospheric sciences Soil and Water Assessment Tool 0208 environmental biotechnology Geography Planning and Development Drainage basin Climate change TJ807-830 runoff 02 engineering and technology Management Monitoring Policy and Law TD194-195 01 natural sciences Renewable energy sources Land use land-use change and forestry GE1-350 SWAT model 0105 earth and related environmental sciences Hydrology geography geography.geographical_feature_category Land use Environmental effects of industries and plants Renewable Energy Sustainability and the Environment 020801 environmental engineering Water resources Environmental sciences climate change Environmental science Surface runoff |
| Zdroj: | Sustainability Volume 12 Issue 16 Sustainability, Vol 12, Iss 6423, p 6423 (2020) |
| ISSN: | 2071-1050 |
| DOI: | 10.3390/su12166423 |
| Popis: | Quantitative assessment of the impact of land use and climate change on hydrological processes is of great importance to water resources planning and management. The main objective of this study was to quantitatively assess the response of runoff to land use and climate change in the Zhengshui River Basin of Southern China, a heavily used agricultural basin. The Soil and Water Assessment Tool (SWAT) was used to simulate the river runoff for the Zhengshui River Basin. Specifically, a soil database was constructed based on field work and laboratory experiments as input data for the SWAT model. Following SWAT calibration, simulated results were compared with observed runoff data for the period 2006 to 2013. The Nash-Sutcliffe Efficiency Coefficient (NSE) and the correlation coefficient (R2) for the comparisons were greater than 0.80, indicating close agreement. The calibrated models were applied to simulate monthly runoff in 1990 and 2010 for four scenarios with different land use and climate conditions. Climate change played a dominant role affecting runoff of this basin, with climate change decreasing simulated runoff by &minus 100.22% in 2010 compared to that of 1990, land use change increasing runoff in this basin by 0.20% and the combination of climate change and land use change decreasing runoff by 60.8m3/s. The decrease of forestland area and the corresponding increase of developed land and cultivated land area led to the small increase in runoff associated with land use change. The influence of precipitation on runoff was greater than temperature. The soil database used to model runoff with the SWAT model for the basin was constructed using a combination of field investigation and laboratory experiments, and simulations of runoff based on that new soil database more closely matched observations of runoff than simulations based on the generic Harmonized World Soil Database (HWSD). This study may provide an important reference to guide management decisions for this and similar watersheds. |
| Databáze: | OpenAIRE |
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