DOI: 10.5194/hess-23-4249-2019
论文题名: Simulating preferential soil water flow and tracer transport using the Lagrangian Soil Water and Solute Transport Model
作者: Sternagel A. ; Loritz R. ; Wilcke W. ; Zehe E.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2019
卷: 23, 期: 10 起始页码: 4249
结束页码: 4267
语种: 英语
Scopus关键词: Catchments
; Groundwater flow
; Hydraulics
; Inverse problems
; Lagrange multipliers
; Pore size
; Rain
; Residence time distribution
; Soil moisture
; Solute transport
; Alternative framework
; Different pore sizes
; Hydraulic properties
; Length distributions
; Preferential soil water flows
; Preferential water flow
; Soil hydraulic functions
; Solute transport model
; Matrix algebra
; catchment
; feasibility study
; flow velocity
; hydrological modeling
; Lagrangian analysis
; macropore
; parameterization
; preferential flow
; simulation
; soil water
; solute transport
; tracer
; transport process
; water flow
英文摘要: We propose an alternative model concept to represent rainfall-driven soil water dynamics and especially preferential water flow and solute transport in the vadose zone. Our LAST-Model (Lagrangian Soil Water and Solute Transport) is based on a Lagrangian perspective of the movement of water particles (Zehe and Jackisch, 2016) carrying a solute mass through the subsurface which is separated into a soil matrix domain and a preferential flow domain. The preferential flow domain relies on observable field data like the average number of macropores of a given diameter, their hydraulic properties and their vertical length distribution. These data may be derived either from field observations or by inverse modelling using tracer data. Parameterization of the soil matrix domain requires soil hydraulic functions which determine the parameters of the water particle movement and particularly the distribution of flow velocities in different pore sizes. Infiltration into the matrix and the macropores depends on their respective moisture state, and subsequently macropores are gradually filled. Macropores and matrix interact through diffusive mixing of water and solutes between the two flow domains, which again depends on their water content and matric potential at the considered depths. The LAST-Model is evaluated using tracer profiles and macropore data obtained at four different study sites in the Weiherbach catchment in southern Germany and additionally compared against simulations using HYDRUS 1-D as a benchmark model. While both models show qual performance at two matrix-flow-dominated sites, simulations with LAST are in better accordance with the fingerprints of preferential flow at the two other sites compared to HYDRUS 1-D. These findings generally corroborate the feasibility of the model concept and particularly the implemented representation of macropore flow and macropore-matrix exchange. We thus conclude that the LAST-Model approach provides a useful and alternative framework for (a) simulating rainfall-driven soil water and solute dynamics and fingerprints of preferential flow as well as (b) linking model approaches and field experiments. We also suggest that the Lagrangian perspective offers promising opportunities to quantify water ages and to evaluate travel and residence times of water and solutes by a simple age tagging of particles entering and leaving the model domain. © 2019. This work is distributed under the Creative Commons Attribution 4.0 License. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162879
Appears in Collections: 气候变化与战略
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作者单位: Sternagel, A., Institute of Water Resources and River Basin Management, Hydrology, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany, Institute of Geography and Geoecology Geomorphology and Soil Science, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany; Loritz, R., Institute of Water Resources and River Basin Management, Hydrology, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany; Wilcke, W., Institute of Geography and Geoecology Geomorphology and Soil Science, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany; Zehe, E., Institute of Water Resources and River Basin Management, Hydrology, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
Recommended Citation:
Sternagel A.,Loritz R.,Wilcke W.,et al. Simulating preferential soil water flow and tracer transport using the Lagrangian Soil Water and Solute Transport Model[J]. Hydrology and Earth System Sciences,2019-01-01,23(10)