Modelling study on subsurface flows affected by macro-pores in marsh sediments

Xin, P, Jin, GQ and Li, L (2009). Modelling study on subsurface flows affected by macro-pores in marsh sediments. In: 16th Asia and Pacific Division Congress of the International Association of Hydraulic Engineering and Research/3rd IAHR International Symposium on Hydraulic Structures, Nanjing, China, (1394-1400). 20-23 October, 2008. doi:10.1007/978-3-540-89465-0_244


Author Xin, P
Jin, GQ
Li, L
Title of paper Modelling study on subsurface flows affected by macro-pores in marsh sediments
Conference name 16th Asia and Pacific Division Congress of the International Association of Hydraulic Engineering and Research/3rd IAHR International Symposium on Hydraulic Structures
Conference location Nanjing, China
Conference dates 20-23 October, 2008
Journal name Advances in Water Resources and Hydraulic Engineering
Place of Publication Berlin; Heidelberg
Publisher Springer
Publication Year 2009
Sub-type Fully published paper
DOI 10.1007/978-3-540-89465-0_244
ISBN 9783540894650
Volume 4
Start page 1394
End page 1400
Total pages 6
Language eng
Abstract/Summary Recent hydrological research on salt marshes based on mathematical models has suggested links of tidally driven pore water flows with both soil aeration rates and plant vegetation patterns, demonstrating the importance of subsurface flows in the salt marsh ecology. Macro-pores, such as crab burrows are typically distributed in marsh sediments, but little attention has been paid to their potential effects on pore water flows in the marsh soil. In this paper, we present the first 3-D model for simulating pore water flows affected by crab burrows. High hydraulic conductivity zones were used to simulate the burrows. We will also discuss the effects of soil compressibility and varying total stress induced by tidal fluctuations. The simulation results show that crab burrows distributed in an upper soil layer can act as water collectors as long as the lower soils is more hydraulically conductive than the overlying soil layer. During the ebb tide, crab burrows collect pore water in the upper soil layer and discharge it into the lower layer. Such a mechanism may enhance pore water exchange between the mash soil and tidal creek, improve soil aeration conditions and increase material exchange between the marsh and coastal water.
Keyword Macro-pore
Crab burrow
Pore water flow
Salt marsh
Numerical modelling
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes v. 1. Water Resources and hydrology -- v. 2. Environmental and ecological hydraulics -- v. 3. Fluvial processes and river engineering -- v. 4. Estuarine and coastal hydraulics -- v. 5. Hydraulic structures for water projects -- v. 6. Hydropower hydraulics.

Document type: Conference Paper
Collection: School of Civil Engineering Publications
 
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Created: Wed, 02 Feb 2011, 15:17:58 EST