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.

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 Spontaneous revegetation of a peatland in Manitoba after peat extraction: diversity of plant assemblages and restoration perspectives

Botany ◽  
2018 ◽  
Vol 96 (11) ◽  
pp. 779-791 ◽  
Author(s):  
Félix Gagnon ◽  
Line Rochefort ◽  
Claude Lavoie
Keyword(s):  
Water Table ◽  
Plant Cover ◽  
High Water ◽  
Point Of View ◽  
Water Table Level ◽  
Peat Extraction ◽  
Peatland Restoration ◽  
Water Ph ◽  
Plant Assemblages ◽  
A Site

There are very few studies on the spontaneous revegetation of cutover fens or bogs from which peat has been extracted to the minerotrophic layers. Most peatlands with fen-type residual peat have problems regenerating a plant cover satisfactorily from a restoration point of view. We nevertheless found a site (Moss Spur, Manitoba, Canada) presenting a substantial and diversified spontaneous plant cover. We estimated that the site would provide insights about natural revegetation processes operating in peatlands. Vegetation assemblages and environmental conditions were surveyed 19 years after extraction activities ceased. Moss Spur has densely revegetated (163 plant species, vegetation cover of 94%) with minimal human assistance. However, the composition of plant assemblages varies considerably across the site, depending on certain abiotic variables, particularly water pH, water table level, and the thickness of the residual peat layer. Moss Spur was remarkably wet considering the past peat extraction activities and the absence of active rewetting procedures. The high water table level may in part explain the successful revegetation. However, plant assemblages were not of equal quality from a restoration perspective. Some assemblages were highly diversified, and especially those dominated by Scirpus cyperinus, a species that should be further considered in peatland restoration projects to direct the recovery of the peatland towards a natural fen species composition.

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

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

Parameters affecting the thickness of bentonite cake in cutoff wall construction: case study and physical modeling

2005 ◽  
Vol 42 (2) ◽  
pp. 646-654 ◽  
Author(s):  
Abbas Soroush ◽  
Mohammad Soroush
Keyword(s):  
Physical Model ◽  
Physical Model Test ◽  
Test Results ◽  
Cutoff Wall ◽  
Bentonite Slurry ◽  
Cutoff Walls ◽  
Plastic Concrete ◽  
Wall Construction ◽  
Using Data

Concrete cutoff walls are usually constructed using a panel-by-panel technique in which primary panels are constructed with space between them and then secondary panels are constructed and inserted in the spaces. A small thickness of residual bentonite cake from the slurry used during excavation usually remains in the construction joints between adjacent primary and secondary panels. The thickness of such bentonite-filled joints should be minimized in terms of the performance of the cutoff wall in controlling seepage. This research experimentally evaluated the effects of a number of design and construction parameters on the thickness of the bentonite cake using data from a case study (the cutoff wall of Karkheh Dam). A physical model test was developed and a number of tests were conducted. The test results showed that parameters such as age of the primary panels, cement content of the slurry, quantity of additives in the slurry, and circulation versus noncirculation of the slurry are responsible for the thickness of the bentonite cake. The results are presented and analyzed.Key words: cutoff wall, plastic concrete, bentonite slurry, bentonite cake, physical model.

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