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Statements

Subject Item
n2:RIV%2F68407700%3A21110%2F12%3A00194428%21RIV13-GA0-21110___
rdf:type
n6:Vysledek skos:Concept
dcterms:description
In the absence of overland flow, shallow subsurface runoff is one of the most important mechanisms determining hydrological responses of headwater catchments to rainstorms. Subsurface runoff can be triggered by preferential flow of infiltrating water frequently occurring in heterogeneous and structured soils as a basically one-dimensional (1D) vertical process. Any attempt to include effects of preferential flow in hydrological hillslope studies is limited by the fact that the thickness of the permeable soil is mostly small compared to the length of the hillslope. The objective of this study is to describe preferential flow effects on hillslope-scale subsurface runoff by combining a 1D vertical dual-continuum approach with a 1D lateral flow equation. The 1D vertical flow of water in a variably saturated soil is described by a coupled set of Richards' equations and the 1D saturated lateral flow of water on less permeable bedrock by the diffusion wave equation. The numerical solution of the combined model was used to study rainfall-runoff events on the Tomsovska hillslope by comparing simulated runoff with observed trench discharge data. The dual-continuum model generated the observed rapid runoff response, which served as an input for the lateral flow model. The diffusion wave model parameters (i.e., length of the contributing hillslope, effective porosity, and effective hydraulic conductivity) indicate that the hillslope length that contributed to subsurface drainage is relatively short (in the range of 25-50 m). Significant transformation of the 1D vertical inflow signal by lateral flow is expected for longer hillslopes, smaller effective conductivities, and larger effective porosities. The physically-based combined modeling approach allows for a consistent description of both preferential flow in a 1D vertical soil profile and lateral subsurface hillslope flow in the simplest way. In the absence of overland flow, shallow subsurface runoff is one of the most important mechanisms determining hydrological responses of headwater catchments to rainstorms. Subsurface runoff can be triggered by preferential flow of infiltrating water frequently occurring in heterogeneous and structured soils as a basically one-dimensional (1D) vertical process. Any attempt to include effects of preferential flow in hydrological hillslope studies is limited by the fact that the thickness of the permeable soil is mostly small compared to the length of the hillslope. The objective of this study is to describe preferential flow effects on hillslope-scale subsurface runoff by combining a 1D vertical dual-continuum approach with a 1D lateral flow equation. The 1D vertical flow of water in a variably saturated soil is described by a coupled set of Richards' equations and the 1D saturated lateral flow of water on less permeable bedrock by the diffusion wave equation. The numerical solution of the combined model was used to study rainfall-runoff events on the Tomsovska hillslope by comparing simulated runoff with observed trench discharge data. The dual-continuum model generated the observed rapid runoff response, which served as an input for the lateral flow model. The diffusion wave model parameters (i.e., length of the contributing hillslope, effective porosity, and effective hydraulic conductivity) indicate that the hillslope length that contributed to subsurface drainage is relatively short (in the range of 25-50 m). Significant transformation of the 1D vertical inflow signal by lateral flow is expected for longer hillslopes, smaller effective conductivities, and larger effective porosities. The physically-based combined modeling approach allows for a consistent description of both preferential flow in a 1D vertical soil profile and lateral subsurface hillslope flow in the simplest way.
dcterms:title
Combining dual-continuum approach with diffusion wave model to include a preferential flow component in hillslope scale modeling of shallow subsurface runoff Combining dual-continuum approach with diffusion wave model to include a preferential flow component in hillslope scale modeling of shallow subsurface runoff
skos:prefLabel
Combining dual-continuum approach with diffusion wave model to include a preferential flow component in hillslope scale modeling of shallow subsurface runoff Combining dual-continuum approach with diffusion wave model to include a preferential flow component in hillslope scale modeling of shallow subsurface runoff
skos:notation
RIV/68407700:21110/12:00194428!RIV13-GA0-21110___
n6:predkladatel
n15:orjk%3A21110
n3:aktivita
n4:P
n3:aktivity
P(GA205/08/1174), P(SP/2E7/229/07)
n3:cisloPeriodika
0
n3:dodaniDat
n10:2013
n3:domaciTvurceVysledku
n9:2289016 n9:5672775 n9:1272888
n3:druhVysledku
n18:J
n3:duvernostUdaju
n17:S
n3:entitaPredkladatele
n20:predkladatel
n3:idSjednocenehoVysledku
127711
n3:idVysledku
RIV/68407700:21110/12:00194428
n3:jazykVysledku
n8:eng
n3:klicovaSlova
Shallow subsurface runoff; Hillslope discharge; Preferential flow; Dual-permeability model; Richards' equation; Boussinesq equation
n3:klicoveSlovo
n7:Shallow%20subsurface%20runoff n7:Dual-permeability%20model n7:Hillslope%20discharge n7:Preferential%20flow n7:Richards%27%20equation n7:Boussinesq%20equation
n3:kodStatuVydavatele
GB - Spojené království Velké Británie a Severního Irska
n3:kontrolniKodProRIV
[8CAC3E0E6427]
n3:nazevZdroje
Advances in Water Resources
n3:obor
n14:DA
n3:pocetDomacichTvurcuVysledku
3
n3:pocetTvurcuVysledku
4
n3:projekt
n13:GA205%2F08%2F1174 n13:SP%2F2E7%2F229%2F07
n3:rokUplatneniVysledku
n10:2012
n3:svazekPeriodika
44
n3:tvurceVysledku
Vogel, Tomáš Dohnal, Michal Gerke, H. H. Dušek, Jaromír
n3:wos
000306615700008
s:issn
0309-1708
s:numberOfPages
13
n19:doi
10.1016/j.advwatres.2012.05.006
n16:organizacniJednotka
21110