JpGU-AGU Joint Meeting 2017

Presentation information

[EE] Poster

A (Atmospheric and Hydrospheric Sciences) » A-GE Geological & Soil Environment

[A-GE39] [EE] Subsurface Mass Transport and Environmental Assessment

Tue. May 23, 2017 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall HALL7)

convener:Shoichiro Hamamoto(Department of Biological and Environmental Engineering, The University of Tokyo), Yuki Kojima(Gifu University), Hirotaka Saito(Department of Ecoregion Science, Tokyo University of Agriculture and Technology), Yasushi Mori(Graduate School of Environmental and Life Science, Okayama University)

[AGE39-P01] Two-dimensional hydraulic analysis of water flow over and through an anisotropic soil layer

*PingCheng Hsieh1, PeiYuan Hsu2 (1.National Chung Hsing University, Taichung, Taiwan, 2.Water Resources Bureau, Kaohsiung City Government, Fengshan, Taiwan)

Keywords:subsurface flow, anisotropic, vertical velocity

In this study, we focus on the hydraulic analysis of a 2-D water flow on a pervious ground down a hillslope. Different from the past, we not only consider the soil layer as a porous medium with an anisotropic permeability, but also consider the vertical component of the flow velocity, and then compare the results with the relevant literature including Makungo & Odiyo (2011) and Dagadu & Nimbalkar (2012). We divide the flow field into two regions (the water layer and the anisotropic soil layer) and derive horizontal component and vertical component of the flow velocity as well as other physical quantities in the two regions. Herein, by regarding the soil layer as an anisotropic and permeable porous medium, we adopt the Song’s (1993) laminar model based on Biot’s poroelastic theory for the momentum equations of the anisotropic soil layer, and the Navier-Stokes equations for the water layer. When considering the anisotropy of permeability in the soil layer, the hydraulic conductivity becomes a tensor, and the momentum equations of the flow in the soil layer should be derived in a new way. Finally, with appropriate boundary conditions and the velocity type set by Desseaux (1999), we derive the horizontal, vertical velocity and (pore) water pressure distributions by taking the Differential Transform Method (DTM) proposed by Arikoglu & Ozkol (2006).