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首页> 外文期刊>Transactions of the ASABE >Simulation of a low-gradient coastal plain watershed using the SWAT landscape model. (Special Issue: Soil and water assessment tool (SWAT) modeling technology: current status.)
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Simulation of a low-gradient coastal plain watershed using the SWAT landscape model. (Special Issue: Soil and water assessment tool (SWAT) modeling technology: current status.)

机译：使用SWAT景观模型模拟低坡度沿海平原流域。 （特刊：水土评估工具（SWAT）建模技术：当前状态。）

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Accurate simulation of landscape processes in natural resource models requires spatial distribution of basin hydrology and transport processes. To better represent these processes, a landscape version of the SWAT model has been developed to simulate the runoff, run-on, and infiltration processes that typically occur in different parts of the landscape. The model addresses flow and transport across hydrologic response units prior to concentration in streams, and is capable of simulating flow and transport from higher landscape positions to lower positions. The SWAT landscape model was tested using data collected from a heavily vegetated riparian buffer system in the Atlantic Coastal Plain near Tifton, Georgia. Simulations of surface runoff, lateral subsurface runoff, and groundwater flow for an upland field, a grass buffer, and a sub-divided forested buffer floodplain were generated. Model results and field data indicate that surface runoff was dominant in the upland field, while groundwater flow was dominant in the grass buffer and the floodplain. While average annual surface runoff agreed satisfactorily with observations from the site, annual and monthly simulated values varied considerably from observed values. Simulated surface runoff tracked general trends in the observed data, but winter months and extreme events were overestimated while summer months were underestimated. Annual surface runoff predictions at the edge of the upland field varied from the observed data by 11% to 44%. The Nash-Sutcliffe efficiency for annual estimates of surface runoff at the field edge was 0.83 for the three-year calibration period. The results demonstrate the ability of the model to simulate the surface runoff and enhanced infiltration typically associated with riparian buffer systems. Additional revision of the model will likely be necessary to adequately represent redistribution of water between surface, lateral subsurface flow, and groundwater flow.
机译：在自然资源模型中准确模拟景观过程需要流域水文和运输过程的空间分布。为了更好地表示这些过程，已经开发了SWAT模型的景观版本来模拟通常发生在景观不同部分的径流，径流和入渗过程。该模型解决了在溪流中集中之前跨水文响应单元的流量和运输，并且能够模拟从较高景观位置到较低位置的流量和运输。使用从佐治亚州蒂夫顿附近的大西洋沿海平原的重度植被河岸缓冲系统收集的数据测试了SWAT景观模型。生成了高地，草缓冲区和细分森林缓冲区洪泛区的地表径流，横向地下径流和地下水流的模拟。模型结果和现场数据表明，在旱地上，地表径流占主导地位，而在草地缓冲区和洪泛区，地下水流占主导地位。虽然年平均地表径流量与现场观测值令人满意，但年和月模拟值与观测值相差很大。模拟的地表径流跟踪了观测数据的总体趋势，但冬季和极端事件被高估了，而夏季被低估了。高地边缘的年度地表径流预测值从观测数据变化了11％至44％。在三年的校准期内，田间边缘地表径流的年度估算值的纳什-萨特克利夫效率为0.83。结果表明，该模型具有模拟通常与河岸缓冲系统相关的地表径流和增强入渗能力。为了充分表示地表水，地下地下水流和地下水流之间的水的重新分配，可能需要对该模型进行额外的修订。

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