ZHONG Xiaomin,ZHONG Keyuan,GAO Yiting,et al.Effect of Land Use Change Caused by Sub-watershed Division in SWAT Model on Runoff and Sediment Simulation[J].Research of Soil and Water Conservation,2022,29(06):52-58.
SWAT模型子流域划分引起的土地利用变化对径流和输沙模拟结果的影响
- Title:
- Effect of Land Use Change Caused by Sub-watershed Division in SWAT Model on Runoff and Sediment Simulation
- 文章编号:
- 1005-3409(2022)06-0052-07
- Keywords:
- SWAT; land use; watershed discretization; runoff; sediment
- 分类号:
- P333; F301.24
- 文献标志码:
- A
- 摘要:
- 为揭示水文模型计算单元划分引起的土地利用变化对模拟结果的影响,采用SWAT模型,通过设置11种子流域阈值情景(4 000,3 200,2 000,1 500,1 100,800,400,200,100,50,25 hm2),并保持地形和土壤数据不变,定量分析了子流域划分引起的土地利用空间离散化对径流输沙模拟结果的影响。结果表明:(1)随着子流域数量的增加,流域内土地利用中面积最大的林地呈先增加后减少趋势,所有情景下林地面积均高于实际林地面积; 而随着土地利用离散程度的增加耕地面积呈减少趋势,水域、草地和建设用地面积则呈增加趋势并逐渐接近实际面积;(2)土地利用空间离散化导致年均径流量(1.85%)和输沙量(65.84%)减少,且对输沙量影响更显著;(3)土地利用空间离散化造成洪水过程和输沙峰值显著降低,并导致年最大1 d、连续最大5 d和连续最大7 d输沙量显著下降(p<0.01)。综上所述,SWAT模型不同子流域划分显著改变了流域土地利用分布,进而引起径流输沙有关参数变化,最终导致径流和输沙模拟结果的变化。
- Abstract:
- In order to reveal the effect of land use change caused by the calculation of unit division in hydrological models on simulation result, eleven scenarios including 4 000, 3 200, 2 000, 1 500, 1 100, 800, 400, 200, 100, 50, 25 hm2 of the sub-watershed thresholds, were used to analyse the effect of land use spatial discretization on runoff and sediment simulation with the SWAT model. Terrain and soil data were input with a single terrain and soil data-set to fix the effect of terrain and soil data spatial discretization. The results showed that:(1)With the increasing number of sub-watersheds, the forestland area increased at first and then decreased, and the area of the forestland was higher than that of the actual forestland area in all scenarios; however, the area of cultivated land decreased with the increasing of the land use discretization degree, moreover, the area of water, grassland and construction land increased and gradually approached the actual area;(2)The spatial discretization of land use led to the decrease of annual average runoff yield(1.85%)and sediment yield(65.84%), which had a more significant effect on sediment yield than runoff;(3)The land use spatial discretization resulted in a significant decrease in the peak value of sediment in flood processes, and resulted in a significant decrease in the sediment yield of maximum one-day, continuous maximum five-day and continuous maximum seven-day(p<0.01)with the increasing of the discretization degree. In conclusion, sub-watershed division significantly changed the distribution of land use in the basin, and then induced the change of runoff and sediment yield parameters, finally, it led to the change of runoff and sediment simulation.
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备注/Memo
收稿日期:2022-02-09 修回日期:2022-03-02
资助项目:江西省教育厅科技项目(GJJ211441); 国家自然科学基金(41601600); 赣州市科技计划项目(202101094931,[2020]60); 赣南师范大学大学生创新创业项目(CX200001); 江西省自然科学基金(20202BABL203031); 江西省城市固废低碳循环技术重点实验室(赣南师范大学)开放基金(20212BCD42015)
第一作者:钟小敏(1996—),女,江西新余人,硕士研究生,研究方向为气候变化与流域水文过程模拟。E-mail:2531563008@qq.com
通信作者:钟科元(1987—),男,江西赣州人,博士,讲师,主要从事环境地理学研究。E-mail:zhongkeyuan@gnnu.edu.cn