Simulation of Groundwater Contaminant Transport at a Decommissioned Landfill Site—A Case Study, Tainan City, Taiwan

Chen, Chao Shi; Tu, Chih-Ho; Chen, Shih‐Jen; Chen, Cheng Chung

doi:10.3390/ijerph13050467

Cited by 27 publications

(18 citation statements)

References 19 publications

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“…The GMS software is a comprehensive package, which is widely used to model groundwater flow in the world [35,36]. The procedure for applying to a groundwater flow model includes four steps: (1) in-situ information collection; (2) conceptual model construction; (3) simulation and calibration of groundwater flow model; (4) predictive simulation.…”

Section: Methodsmentioning

confidence: 99%

“…For a long time (several decades), human activity has been the main influencing factor of groundwater storage. According to the statistical development report on paddy fields and annual official report on water resources, the paddy field acreage was enlarged more than 25 times over the last three decades, and in addition to that, 10 times more groundwater was pumped [26,36,38].…”

Section: Factors Influecing the Groundwater Storage Changementioning

confidence: 99%

“…The specific yield of aquifer (μ) can be referenced from relevant hydrogeological parameter data in the Sanjiang Plain ( Table 2, initial value), and subsequently determined by the simulation and calibration based on Groundwater Modelling System (GMS) software. The GMS software is a comprehensive package, which is widely used to model groundwater flow in the world [35,36]. The procedure for applying to a groundwater flow model includes four steps: (1) in-situ information collection; (2) conceptual model construction; (3) simulation and calibration of groundwater flow model; (4) predictive simulation.…”

Section: Methodsmentioning

confidence: 99%

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Assessment of Shallow Groundwater Recharge from Extreme Rainfalls in the Sanjiang Plain, Northeast China

Liu

Jiang

Zhang

et al. 2016

Water

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Groundwater recharge from rainstorms can be vital for regional water resources. With the expansion of the need for more water in some specific regions under global climate change, groundwater is being pumped at a far greater rate than it can be naturally replenished. Considering that excess rainstorms could be utilized for groundwater recharge to lessen the declining tendency of regional groundwater level in the Sanjiang Plain, Northeast China, we analyzed groundwater changes in the quantity of a regional shallow aquifer in the region following extreme rainfall in 2013. The results show that shallow groundwater table in the north and central Sanjiang Plain increased following the 2013 extreme rainfall. Most of the annual maximal change of groundwater depth (MCGD) was in the range of 1 m to 3 m, occupying 72.1% of the study area. The average MCGD was 1.73 m in 2013, about 0.4 m higher than the mean value during the last five years (1.33 m). Spatially, the overall average groundwater depth showed an increasing trend from the southeast to the midwest and northeast. We estimated a total recharge of approximately 41.14 × 10 8 m 3 from the 2013 extreme rainfall across the north and central Sanjiang Plain. This large quantity of recharge demonstrates the important role that large rainstorms can play in regional shallow groundwater resources.

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Section: Methodsmentioning

confidence: 99%

Section: Factors Influecing the Groundwater Storage Changementioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Assessment of Shallow Groundwater Recharge from Extreme Rainfalls in the Sanjiang Plain, Northeast China

Liu

Jiang

Zhang

et al. 2016

Water

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“…The anthropogenic sources are generally ascribed to extreme use of agricultural, pesticides and fertilizers, mining wastes, disposal of industrial wastes, waste disposal sites, and imperfect well construction [22]. Chen et al (2016) [23] simulated the groundwater contamination in Tainan City, Taiwan, and the study revealed that the total mass of pollutants in the aquifer increased by 72% after 10 years. [24] studied the groundwater quality of Turfy Swamps in the Changbai Mountain area below the highway as the related pollutant, and showed a great influence on the groundwater quality of these wetlands with increasing highway operation time.…”

Section: Introductionmentioning

confidence: 99%

Integrated Modelling for Groundwater Contamination from Polluted Streams Using New Protection Process Techniques

Abd‐Elaty

Zeleňáková

Straface

et al. 2019

Water

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Evaluating water quality indicators is a crucial issue in integrated water resource management, since potable water is an essential resource for the world's health and sustainable development. The current study was developed using a coupled model of MODFLOW and MT3DMS (Mass Transport 3-Dimension Multi-Species) to integrate two water supply systems, surface water (polluted drains and canals) and ground water, to identify the contamination process of the groundwater from drains as fresh water is polluted and the contamination level exceeds the standard limits. The study was applied to two cases: the first was a hypothetical simulation and the second was the real case of the Nile Delta Aquifer (NDA). Four different scenarios were simulated to first identify groundwater contamination by total dissolved solids (TDS), and then select the more efficient protection process. The first scenario involved changing polluted drain and canal boundary conditions regarding head and concentration; the second consisted of studying the location of the polluted drain in a low permeability layer or a confined aquifer; the third was based on installing a cut-off wall in the polluted drain sides; and the fourth investigated the use of lining materials for polluted drains. The results reveal that aquifer contamination was decreased by increasing the water head of canals by 50 cm and decreasing the drain head by 50 cm and concentration by 25%, whereby large quantities of groundwater were protected. The percentages of salt repulsion in the hypothetical case were +10.66, +12.89, and +24.99%, while in NDA they were +6.29, +8.71, and +25% respectively compared with the base case. Decreasing the aquifer hydraulic conductivity led to decrease in aquifer contamination, in which the confined aquifer pollution was less than the unconfined aquifers due to the clay cap, which plays a significant role in minimizing the solute transport into the groundwater reservoir, and to reduction of the aquifer salt variation by +19.01% for the hypothetical case. The results indicate that the cut-off wall is effective for contamination management in shallow aquifers (hypothetical case) and the reduction in aquifer salt was +28.49%, whereas it had no effect in the deep aquifer (NDA), where the salt was reduced by just +0.34%. Using the drain lining scenario prevented contamination from the polluted drains and protected the freshwater in the aquifer, so that the aquifer salt mass reductions were +91.02 and +70.13% for the hypothetical case and NDA respectively, indicating that this method is more effective for controlling groundwater contamination. Polluted drains should be located in a low permeability layer to minimize the water degradation. This study represents a new contribution to groundwater protection techniques by changing the boundary conditions, installing a cut-off wall and using linings for polluted drains, and shows the way forward for the future treatment of polluted stream networks.

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“…The migration of these substances in water surface and rock ambient poses a major threat to the environment, especially to the quality of surface and groundwater [ 1 ]. There are studies dealing with the modelling of the migration of these substances in groundwater in Taiwan [ 2 ], along with efforts to influence the quality of leachate directly in situ using adsorbent materials based on zeolite and perlite [ 3 ]. Taking into account that landfilling is, and in the near future will continue to be, one of the most widespread methods of waste disposal, it is necessary to study this issue in detail.…”

Section: Introductionmentioning

confidence: 99%

Leachate from Municipal Waste Landfill and Its Natural Degradation—A Case Study of Zubří, Zlín Region

Václavík

Ondrasikova²,

Dvorský

et al. 2016

IJERPH

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This work deals with the natural degradation of leachate from an old reclaimed landfill by means of a biological pond. Hamra is a municipal waste landfill with a limited formation of leachate, which has already been reclaimed. Leachate in this location is disposed of using natural biogeochemical method, and it is subsequently discharged into a surface stream. The main issue dealt with here is the long-term effectiveness of natural degradation of leachate and the limits of its use. The solutions of these fundamental questions took advantage of a database of analytical assessments collected during a long-term monitoring of the landfill site. The primary degradation trends and the long-term development have been revealed and described on the basis of these assessments. The main benefit of the biological pond is the dilution of the dominant contaminants, especially of inorganic character. In the case of ammonium ions, they show nitrification caused by their transition from the reduction into oxidizing environment. From a long term point of view, the disadvantage of natural degradation of leachate can be seen in the gradual reduction in efficiency due to the concentration of the substances or an undesired growth of water plants, which can be successfully eliminated, for example, by means of targeted aeration and by maintaining vegetation in the pond and its surroundings. The biological potential of the locality is very favorable and, despite its anthropogenic load, it creates a location with suitable living conditions for many water animals and plants. That is why it can be concluded that the efficiency of the natural biochemical cleaning elements can be considered as sufficient, taking into account the nature of the deposited waste, the quantity and quality of leachate, as well as the climate character of the locality.

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Simulation of Groundwater Contaminant Transport at a Decommissioned Landfill Site—A Case Study, Tainan City, Taiwan

Cited by 27 publications

References 19 publications

Assessment of Shallow Groundwater Recharge from Extreme Rainfalls in the Sanjiang Plain, Northeast China

Assessment of Shallow Groundwater Recharge from Extreme Rainfalls in the Sanjiang Plain, Northeast China

Integrated Modelling for Groundwater Contamination from Polluted Streams Using New Protection Process Techniques

Leachate from Municipal Waste Landfill and Its Natural Degradation—A Case Study of Zubří, Zlín Region

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