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| DOI：10.13522/j.cnki.ggps.20180611 |
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| Using LU-SWAT Model to Analyze the Response of Hydrological Processes to Land Use/Coverage with Application to an Upper Watershed in Heihe Basin |
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JIN Xin， JIN Yanxiang*， YANG Dengxing
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Qinghai Normal University, Xining 810016, China
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| Abstract: |
| 【Objective】 Land use and cover affects hydrological process in catchment, and this paper analyzes the response of hydrological process to land usage and vegetation coverage in a upper watershed in Heihe basin.【Method】The analysis was based on the LU-SWAT model in combination with variable-controlled method to elicit the impact of land use/ land coverage on surface runoff, lateral flow, ET, groundwater and total water yield from 1990 to 2009. 【Result】 The LU-SWAT model worked well. For simulating the monthly streamflow, its associated Nash value and relative error were 0.93 and 0.94 respectively, while for yearly streamflow, they were 0.83 and 0.86 respectively. All simulated hydrological parameters were consistent with the characteristics of hydrological processes seen at the arid regions in Northwest China. From 1990 to 2000, the reduced forestry areas were the main land use change, while from 2001 to 2009 the main land use change was the increase in forest and grassland, together with reduced barren lands. From 1990 to 2001, surface runoff, ET and total water yield increased, at expense of groundwater table dropping. From 2002 to 2009, lateral flow, surface runoff, ET and total water yield decreased, with groundwater table rebounding. Changes in all hydrological factors were more manifest under dry climate than under others. 【Conclusion】 From 1990 to 2000, the upper watershed at Heihe basin endured a decrease in forest, giving rise to increases in surface runoff, lateral flow, ET and total water yield, accompanied by groundwater table dropping. From 1990 to 2000, revegetating the barren lands reduced surface runoff, lateral flow, ET and total water yield, leading to groundwater table rebounding. |
| Key words: model; Upper Reaches of the Heihe River; Land use/land cover change; Catchment; Hydrological process |
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