Multiresponse modeling of variably saturated flow and isotope tracer transport for a hillslope experiment at the Landscape Evolution Observatory
Multiresponse modeling of variably saturated flow and isotope tracer transport for a hillslope experiment at the Landscape Evolution Observatory
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景观演化观测站山坡实验的可变饱和流和同位素示踪剂传输的多响应建模
DOI：
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
P. Troch
中科院分区：
文献类型：
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作者：
C. Scudeler;L. Pangle;D. Pasetto;G. Niu;T. Volkmann;C. Paniconi;M. Putti;P. Troch
抽象的。本文探讨了模型参数化和过程表示的挑战时，模拟多个水文响应，从一个高度控制的非饱和流和传输实验与物理模型。该实验在景观演变观测站（LEO）进行，包括将水和富氘水交替注入最初非常干燥的山坡。多变量观测包括点测量土壤中的含水量和示踪剂浓度，山坡内的总存储量，以及通过渗流面的水和示踪剂的综合通量。模拟进行了三维有限元模型，解决了理查兹和对流扩散方程。综合流，综合运输，分布式流，分布式运输响应进行了连续分析，在每一步的参数化选择支持标准模型的性能指标。在我们分析的第一步，其中渗流面流量，水存储，并在渗流面的平均浓度的目标响应，测量和模拟变量之间的充分匹配，获得了一个简单的参数化一致，从以前的流量只有实验在低地球轨道。当传递到分布式响应，它是必要的，以获得一个适当的匹配点尺度流量响应的额外的土壤水力参数的复杂性。这也提高了对示踪剂浓度的点测量的匹配，尽管这里的模型性能相当差。这表明，仍然需要更大的复杂性，在模型参数化，或可能存在的差距，在非常干燥的土壤中模拟溶质运移现象的过程表示。
Abstract. This paper explores the challenges of model parameterization and process representation when simulating multiple hydrologic responses from a highly controlled unsaturated flow and transport experiment with a physically based model. The experiment, conducted at the Landscape Evolution Observatory (LEO), involved alternate injections of water and deuterium-enriched water into an initially very dry hillslope. The multivariate observations included point measures of water content and tracer concentration in the soil, total storage within the hillslope, and integrated fluxes of water and tracer through the seepage face. The simulations were performed with a three-dimensional finite element model that solves the Richards and advection–dispersion equations. Integrated flow, integrated transport, distributed flow, and distributed transport responses were successively analyzed, with parameterization choices at each step supported by standard model performance metrics. In the first steps of our analysis, where seepage face flow, water storage, and average concentration at the seepage face were the target responses, an adequate match between measured and simulated variables was obtained using a simple parameterization consistent with that from a prior flow-only experiment at LEO. When passing to the distributed responses, it was necessary to introduce complexity to additional soil hydraulic parameters to obtain an adequate match for the point-scale flow response. This also improved the match against point measures of tracer concentration, although model performance here was considerably poorer. This suggests that still greater complexity is needed in the model parameterization, or that there may be gaps in process representation for simulating solute transport phenomena in very dry soils.
影响因子：
6.4
作者：
Haverd, Vanessa;Cuntz, Matthias
通讯作者：
Cuntz, Matthias
模拟人工流域中小溪的形成和发展的两种方法
影响因子：
5.4
作者：
M. Hofer;P. Lehmann;M. Stähli;S. Seifert;M. Krafczyk
通讯作者：
M. Krafczyk