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פותח על ידי קלירמאש פתרונות בע"מ -
Numerical analyses of subsurface flow in a steep hillslope under rainfall: The role of the spatial heterogeneity of the formation hydraulic properties
Year:
2007
Source of publication :
Water Resources Research
Authors :
רוסו, דוד
;
.
Volume :
43
Co-Authors:
Fiori, A., Dipartimento di Scienze dell'Ingegneria Civile, Università di Roma Tre, Rome, Italy, Dipartimento di Scienze dell'Ingegneria Civile, Università di Roma Tre, via V.Volterra 62, 00146 Roma, Italy
Russo, D., Department of Environmental Physics and Irrigation, Institute of Soils, Water and Environmental Sciences, Agricultural Research Organization, Bet Dagan, Israel, Department of Environmental Physics and Irrigation, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Facilitators :
From page:
To page:
(
Total pages:
1
)
Abstract:
The paper aims at analyzing subsurface flow and streamflow generation in steep hillslopes after rainfall. The principal scope of the work is to assess the role played by the spatial variability of the hydraulic properties on the subsurface flow patterns and hillslope discharge. We try to address this task through a three-dimensional numerical model which solves the Richards equation under prescribed initial and boundary conditions. Along an established practice, the relevant hydraulic parameters are modeled as random space functions with given statistical properties. Realistic features of the spatially variable formation parameters and the precipitation data are incorporated into the simulation model. It is found that spatial heterogeneity has a significant impact on the movement of water in the hillslope and the streamflow generation. In particular, the heterogeneous systems are more sensitive to rain input and display an increase of both the water table and saturation which is faster than the homogeneous case. The same is for water velocity, which is everywhere larger when heterogeneity is considered. As a consequence, the dynamics of subsurface stormflow (recognized as the leading mechanism for streamflow generation in the simulations) and the outflow discharge produced by the hillslope after a rain event are enhanced by heterogeneity. Despite of the possible lack of generality of the numerical experiments, they provide useful insight into the complex dynamics occurring in hillslope systems. The simulations show the importance of including realistic spatial heterogeneity in hillslope hydrology studies. Copyright 2007 by the American Geophysical Union.
Note:
Related Files :
Flow patterns
heterogeneity
Numerical methods
rain
rainfall
Statistical properties
streamflow
Streamflow generation
water table
עוד תגיות
תוכן קשור
More details
DOI :
10.1029/2006WR005365
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
22847
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:54
Scientific Publication
Numerical analyses of subsurface flow in a steep hillslope under rainfall: The role of the spatial heterogeneity of the formation hydraulic properties
43
Fiori, A., Dipartimento di Scienze dell'Ingegneria Civile, Università di Roma Tre, Rome, Italy, Dipartimento di Scienze dell'Ingegneria Civile, Università di Roma Tre, via V.Volterra 62, 00146 Roma, Italy
Russo, D., Department of Environmental Physics and Irrigation, Institute of Soils, Water and Environmental Sciences, Agricultural Research Organization, Bet Dagan, Israel, Department of Environmental Physics and Irrigation, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Numerical analyses of subsurface flow in a steep hillslope under rainfall: The role of the spatial heterogeneity of the formation hydraulic properties
The paper aims at analyzing subsurface flow and streamflow generation in steep hillslopes after rainfall. The principal scope of the work is to assess the role played by the spatial variability of the hydraulic properties on the subsurface flow patterns and hillslope discharge. We try to address this task through a three-dimensional numerical model which solves the Richards equation under prescribed initial and boundary conditions. Along an established practice, the relevant hydraulic parameters are modeled as random space functions with given statistical properties. Realistic features of the spatially variable formation parameters and the precipitation data are incorporated into the simulation model. It is found that spatial heterogeneity has a significant impact on the movement of water in the hillslope and the streamflow generation. In particular, the heterogeneous systems are more sensitive to rain input and display an increase of both the water table and saturation which is faster than the homogeneous case. The same is for water velocity, which is everywhere larger when heterogeneity is considered. As a consequence, the dynamics of subsurface stormflow (recognized as the leading mechanism for streamflow generation in the simulations) and the outflow discharge produced by the hillslope after a rain event are enhanced by heterogeneity. Despite of the possible lack of generality of the numerical experiments, they provide useful insight into the complex dynamics occurring in hillslope systems. The simulations show the importance of including realistic spatial heterogeneity in hillslope hydrology studies. Copyright 2007 by the American Geophysical Union.
Scientific Publication
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