scholarly journals DOC and CO2-C Releases from Pristine and Drained Peat Soils in Response to Water Table Fluctuations: A Mesocosm Experiment

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Merjo P. P. Laine ◽  
Rauni Strömmer ◽  
Lauri Arvola
Keyword(s):  
Water Table ◽  
Dilution Effect ◽  
High Water ◽  
Mesocosm Experiment ◽  
Water Runoff ◽  
Peat Soils ◽  
High Water Table ◽  
Doc Load ◽  
Agricultural Areas ◽  
Response To Water

Hydrological conditions are considered to be among the main drivers influencing the export of dissolved organic carbon (DOC) from terrestrial to aquatic ecosystems, and hydrology is likely to alter due to climate change. We built a mesocosm experiment by using peat profiles from a pristine and from a drained (drained in 1978) peatland. A several-week-long low water table period followed by a high water table period, that is, a setting mimicking drought followed by flood, released relatively more DOC from pristine peat than from drained peat. From pristine peat profiles DOC was released into soil water in such quantities that the concentration of DOC remained stable despite dilution caused by added spring water to the mesocosms. In drained peat the DOC concentrations decreased during the high water table period indicating stronger dilution effect in comparison to pristine peat. At the landscape level DOC load from a drained peatland to the recipient water body may, however, increase during flooding because of high water runoff out of the peatland containing high DOC concentrations relative to the forest and agricultural areas. During the high water table period neither peat type nor water table had any clear impact on carbon dioxide (CO2-C) fluxes.

Soil behavior and related effects in the Peru earthquake of May 31, 1970

1971 ◽  
Vol 61 (3) ◽  
pp. 579-590 ◽  
Author(s):  
William Enkeboll
Keyword(s):  
Water Table ◽  
High Water ◽  
Soil Behavior ◽  
High Water Table ◽  
Water Conditions ◽  
Degree Of Damage ◽  
Soil And Water

abstract Soil and water conditions had an effect on the degree of damage to structures. Most structures were located on alluvium with a high water table. Settlements occurred in dike and causeway fill in Chimbote harbor. Severe problems to communication occurred in some areas through embankment failures and road slides.

scholarly journals Evaluating the influence of water table depth on transpiration of two vegetation communities in a lake floodplain wetland

2016 ◽  
Vol 47 (S1) ◽  
pp. 293-312 ◽  
Author(s):  
Xiuli Xu ◽  
Qi Zhang ◽  
Yunliang Li ◽  
Xianghu Li
Keyword(s):  
Water Table ◽  
Growth Stage ◽  
High Water ◽  
Water Table Depth ◽  
Floodplain Wetlands ◽  
Floodplain Wetland ◽  
Vegetation Communities ◽  
High Water Table ◽  
Potential Transpiration ◽  
Main Growth

Groundwater plays an important role in supplying water to vegetation in floodplain wetlands. Exploring the effect of water table depth (WTD) on vegetation transpiration is essential to increasing understanding of interactions among vegetation, soil water, and groundwater. In this study, a HYDRUS-1D model was used to simulate the water uptake of two typical vegetation communities, Artemisia capillaris and Phragmites australis, in a floodplain wetland (Poyang Lake wetland, China). Vegetation transpiration was compared for two distinct hydrological conditions: high water table (2012) and low water table (2013). Results showed that vegetation transpiration in the main growth stage (July–October) was significantly influenced by WTD. Under high water table conditions, transpiration of A. capillaris and P. australis communities in the main growth stage totaled 334 and 735 mm, respectively, accounting for over 90% of the potential transpiration. Under low water table conditions, they decreased to 203 and 510 mm, respectively, due to water stress, accounting for merely 55% of the potential transpiration. Scenario simulations found different linear relationships between WTD and the ratio of groundwater contribution to vegetation transpiration. An increase of 1 m in WTD in the main growth stage may reduce the ratio by approximately 25%.

scholarly journals IRRIGATION MANAGEMENT FOR DOUBLE-CROPPED FRESH-MARKET TOMATOES ON A HIGH-WATER-TABLE SOIL

1991 ◽  
Vol 34 (6) ◽  
pp. 2445-2452
Author(s):  
C. R. Camp ◽  
M. L. Robbins ◽  
D. L. Karlen ◽  
R. E. Sojka
Keyword(s):  
Water Table ◽  
Irrigation Management ◽  
High Water ◽  
Fresh Market ◽  
High Water Table

Design of a hydrodynamic leachate containment system

1989 ◽  
Vol 16 (5) ◽  
pp. 615-626 ◽  
Author(s):  
M. D. Haug ◽  
D. J. L. Forgie ◽  
S. L. Barbour
Keyword(s):  
Contaminant Transport ◽  
Water Table ◽  
High Water ◽  
Groundwater Table ◽  
Cutoff Wall ◽  
Transport Modelling ◽  
High Water Table ◽  
Cutoff Walls ◽  
A Site

This paper presents the design concept for a case study sanitary landfill on a site that would not normally have been approved owing to the presence of a high water table. In this design, the base of the landfill was intentionally placed below the water table. A massive 2.5 m wide, 2.5 m high cutoff wall and a 0.3 m thick liner with hydraulic conductivities of approximately 5 × 10−10 m/s were constructed of recompacted glacial till to limit both groundwater intrusion into the landfill and leachate migration out of the landfill. In this case study, the landfill base was placed below the water table to (i) provide a relatively inexpensive source of cover material and (ii) use the hydrodynamic gradient from the high water table to help contain the leachate. Finite element modelling of the seepage and contaminant transport, for alternate designs for lined and unlined landfills placed above and below the groundwater table, is shown to confirm a previous, less-sophisticated, estimation that placing a lined landfill below the groundwater table has definite advantages in reducing both leachate seepage and contaminant transport. Key words: landfill, leachate, hydrodynamic containment, liners, compacted earth cutoff walls, seepage and contaminant transport modelling.

Thermal regime of mollisols under high water-table conditions

1979 ◽  
Vol 20 (6) ◽  
pp. 493-505 ◽  
Author(s):  
R.P. Tripathi ◽  
B.P. Ghildyal
Keyword(s):  
Water Table ◽  
Thermal Regime ◽  
High Water ◽  
High Water Table
Sign in / Sign up

Export Citation Format

Share Document