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Evaluating explicit and implicit routing for watershed hydro‐ecological models of forest hydrology at the small catchment scale

机译：在小流域尺度上评估森林水文学流域水生态模型的显式和隐式路由

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This paper explores the behaviour and sensitivity of a watershed model used for simulating lateral soil water redistribution and runoff production. In applications such as modelling the effects of land-use change in small headwater catchments, interactions between soil moisture, runoff and ecological processes are important. Because climate, soil and canopy characteristics are spatially variable, both the pattern of soil moisture and the associated outflow must be represented in modelling these processes. This study compares implicit and explicit routing approaches to modelling the evolution of soil moisture pattern and spatially variable runoff production. It also addresses the implications of using different landscape partitioning strategies. This study presents the results of calibration and application of these different routing and landscape partitioning approaches on a 60 ha forested watershed in Western Oregon. For comparison, the different approaches are incorporated into a physically based hydro-ecological model, RHESSys, and the resulting simulated soil moisture, runoff production and sensitivity to unbiased error are examined. Results illustrate that both routing approaches can be calibrated to achieve a reasonable fit between observed and modelled outflow. Calibrated values for effective watershed hydraulic conductivity are higher for the explicit routing approach, which illustrates differences between the two routing approaches in their representation of internal watershed dynamics. The explicit approach illustrates a seasonal shift in drainage organization from watershed to more local control as climate goes from a winter wet to a summer dry period. Assumptions used in the implicit approach maintain the same pattern of drainage organization throughout the season. The implicit approach is also more sensitive to random error in soil and topographic input information, particularly during wetter periods. Comparison between the two routing approaches illustrates the advantage of the explicit routing approach, although the loss of computational efficiency associated with the explicit routing approach is noted. To compare different strategies for partitioning the landscape, the use of a non-grid-based method of partitioning is introduced and shown to be comparable to grid-based partitioning in terms of simulated soil moisture and runoff production. Copyright © 2001 John Wiley & Sons, Ltd.
机译：本文探讨了用于模拟土壤侧向水分再分配和径流产生的分水岭模型的行为和敏感性。在模拟小型源头流域土地利用变化的影响等应用中，土壤水分，径流和生态过程之间的相互作用非常重要。由于气候，土壤和林冠特征在空间上是可变的，因此在对这些过程进行建模时必须同时表示土壤水分的模式和相关的流出量。这项研究比较了隐式和显式路由方法来模拟土壤水分模式的演变和空间可变径流的产生。它还解决了使用不同的景观分区策略的含义。这项研究提出了在俄勒冈州西部一个占地60公顷的森林流域上对这些不同的路径选择和景观分区方法进行校准和应用的结果。为了进行比较，将不同的方法结合到基于物理的水生态模型RHESSys中，并检查了由此产生的模拟土壤湿度，径流产量和对无偏误差的敏感性。结果表明，可以对两种布线方法进行校准，以实现观察到的流出与建模流出之间的合理拟合。对于显式路由方法，有效分水岭水力传导率的校准值较高，这说明了两种路由方法在内部流域动力学表示中的差异。明确的方法表明，随着气候从冬季潮湿到夏季干旱，排水系统的组织结构从分水岭转向季节性的局部控制。隐性方法中使用的假设在整个季节内保持相同的排水组织模式。隐式方法对土壤和地形输入信息中的随机误差也更敏感，尤其是在潮湿的时期。两种路由方法之间的比较说明了显式路由方法的优点，尽管已注意到与显式路由方法相关的计算效率的损失。为了比较不同的分区策略，引入了一种基于非网格的分区方法，该方法在模拟土壤水分和径流产生方面与基于网格的分区相当。版权所有©2001 John Wiley＆Sons，Ltd.

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