【摘要】 【目的】研究土地利用方式变化对排涝模数的影响,优化区域排涝管理。【方法】选取湖北四湖流域螺山排区为研究区域,将流域水文模型SWAT和土地利用变化模型CLUE-S联合应用,设置了6种水旱比、5种水面率及5种城市化率的单因素变化(即其他2个因素不发生变化)条件下不同土地利用情景,应用CLUE-S模型模拟生成各情景下的土地利用空间分布图,建立了SWAT模型模拟不同土地利用情景的降雨径流过程,分析了不同土地利用方式对排涝模数的影响。【结果】在相同的设计暴雨、其他因素维持现状条件下:当水旱比由0增加到1时,排涝模数减小了0.117 m~3/(s·km~2);当水面率由0增加到20%时,排涝模数减小了0.111 m~3/(s·km~2);当城市化率由0增加到10%时,排涝模数增加了0.104 m~3/(s·km~2)。排涝模数随着水旱比和水面率的增大均呈减小趋势,随着城市化率的增大呈增大趋势。在相同设计暴雨、其他因素维持现状条件下:当水旱比由0增加到0.2时,排涝模数只减小了3.06%;当水面率由0增加到10%时,排涝模数减小了14.03%;当城市化率由0增大到10%时,排涝模数增大了16.67%。3种引起土地利用方式变化的因素中,排涝模数对水面率和城市化率变化的敏感程度相当,对二者的敏感程度明显大于水旱比。【结论】在未来区域规划中,可以通过增大水旱比、增大水面面积和限制城市扩张来减轻排涝压力,其中适当增大水面面积和限制城市扩张更加有效。更多还原

【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 m~3/(s · km~2), while when the water surface ratio increased from 0 to 20% the drainage modulus decreased by 0.111 m~3/(s · km~2). Increasing the urbanization ratio from 0 to 10% reduced the drainage modulus by 0.104 m~3/(s · km~2). 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%; ② increasing 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.更多还原