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

Xin, Pei, Jin, Guangqiu and Li, Ling (2009). Modelling study on subsurface flows affected by macro-pores in marsh sediments. In: Advances in Water Resources and Hydraulic Engineering: Proceedings of 16th IAHR-APD congress and 3rd symposium of IAHR-ISHS. 16th International Association of Hydraulic Engineering and Research. Asia and Pacific Division. Congress, Nanjing, China, (1394-1400). 20-23 October 2008. doi:10.1007/978-3-540-89465-0_244


Author Xin, Pei
Jin, Guangqiu
Li, Ling
Title of paper Modelling study on subsurface flows affected by macro-pores in marsh sediments
Conference name 16th International Association of Hydraulic Engineering and Research. Asia and Pacific Division. Congress
Conference location Nanjing, China
Conference dates 20-23 October 2008
Proceedings title Advances in Water Resources and Hydraulic Engineering: Proceedings of 16th IAHR-APD congress and 3rd symposium of IAHR-ISHS
Place of Publication Beijing China
Publisher Tsinghua University Press
Publication Year 2009
Sub-type Fully published paper
DOI 10.1007/978-3-540-89465-0_244
ISBN 9787302186625; 9783540894643; 9783540894650;
Volume IV
Start page 1394
End page 1400
Total pages 7
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.
Subjects 0905 Civil Engineering
Keyword Crab burrow
Macro-pore
Numerical Modelling
Pore water flow
Salt marsh
Q-Index Code EX
Q-Index Status Provisional Code

Document type: Conference Paper
Collection: School of Civil Engineering Publications
 
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