Combined effects of tides, evaporation and rainfall on the soil conditions in an intertidal creek-marsh system

Xin, Pei, Zhou, Tingzhang, Lu, Chunhui, Shen, Chengji, Zhang, Chenming, D'Alpaos, Andrea and Li, Ling (2017) Combined effects of tides, evaporation and rainfall on the soil conditions in an intertidal creek-marsh system. Advances in Water Resources, 103 1-15. doi:10.1016/j.advwatres.2017.02.014

Author Xin, Pei
Zhou, Tingzhang
Lu, Chunhui
Shen, Chengji
Zhang, Chenming
D'Alpaos, Andrea
Li, Ling
Title Combined effects of tides, evaporation and rainfall on the soil conditions in an intertidal creek-marsh system
Journal name Advances in Water Resources   Check publisher's open access policy
ISSN 0309-1708
Publication date 2017-05-01
Year available 2017
Sub-type Article (original research)
DOI 10.1016/j.advwatres.2017.02.014
Open Access Status Not yet assessed
Volume 103
Start page 1
End page 15
Total pages 15
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon Press
Language eng
Abstract Salt marshes, distributed globally at the land-ocean interface, are a highly productive eco-system with valuable ecological functions. While salt marshes are affected by various eco-geo-hydrological processes and factors, soil moisture and salinity affect plant growth and play a key role in determining the structure and functions of the marsh ecosystem. To examine the variations of both soil parameters, we simulated pore-water flow and salt transport in a creek-marsh system subjected to spring-neap tides, evaporation and rainfall. The results demonstrated that within a sandy-loam marsh, the tide-induced pore-water circulation averted salt build-up due to evaporation in the near-creek area. In the marsh interior where the horizontal drainage was weak, density-driven flow was responsible for dissipating salt accumulation in the shallow soil layer. In the sandy-loam marsh, the combined influences of spring-neap tides, rainfall and evaporation led to the formation of three characteristic zones, c.f., a near-creek zone with low soil water saturation (i.e., well-aerated) and low pore-water salinity as affected by the semi-diurnal spring tides, a less well-aerated zone with increased salinity where drainage occurred during the neap tides, and an interior zone where evaporation and rainfall infiltration regulated the soil conditions. These characteristics, however, varied with the soil type. In low-permeability silt-loam and clay-loam marshes, the tide-induced drainage weakened and the soil conditions over a large area became dominated by evaporation and rainfall. Sea level rise was found to worsen the soil aeration condition but inhibit salt accumulation due to evaporation. These findings shed lights on the soil conditions underpinned by various hydrogeological processes, and have important implications for further investigations on marsh plant growth and ecosystem functions.
Keyword Plant zonation
Pore-water flow
Pore-water salinity
Sea level rise
Soil moisture
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID 51579077
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
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