Simulation of saltwater intrusion into coastal aquifer of Nagapattinam in the lower cauvery basin using SEAWAT

A., None K. N. B. Dunlop, G. A. King, E.; Palanichamy, Jegathambal; Kokkat, Aswin; Ej, James; Palani, Sundarambal

doi:10.1016/j.gsd.2018.11.014

Cited by 27 publications

(5 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although fresh water in the soil-water-bearing layer is often not adequate for human consumption, it plays an essential role in sustaining agricultural and natural environments [4,5]. Saltwater intrusion into the freshwater surface layer is a natural process that takes place in coastal regions due to changes in the hydrological systems and fluctuations in the groundwater table level [6,7]. Concurrent with drought, it severely damages soil layers around coastal regions [8,9].…”

Section: Introductionmentioning

confidence: 99%

Estimating Soil Water Susceptibility to Salinization in the Mekong River Delta Using a Modified DRASTIC Model

Tran

et al. 2021

Water

View full text Add to dashboard Cite

Saltwater intrusion risk assessment is a foundational step for preventing and controlling salinization in coastal regions. The Vietnamese Mekong Delta (VMD) is highly affected by drought and salinization threats, especially severe under the impacts of global climate change and the rapid development of an upstream hydropower dam system. This study aimed to apply a modified DRASTIC model, which combines the generic DRASTIC model with hydrological and anthropogenic factors (i.e., river catchment and land use), to examine seawater intrusion vulnerability in the soil-water-bearing layer in the Ben Tre province, located in the VMD. One hundred and fifty hand-auger samples for total dissolved solids (TDS) measurements, one of the reflected salinity parameters, were used to validate the results obtained with both the DRASTIC and modified DRASTIC models. The spatial analysis tools in the ArcGIS software (i.e., Kriging and data classification tools) were used to interpolate, classify, and map the input factors and salinization susceptibility in the study area. The results show that the vulnerability index values obtained from the DRASTIC and modified DRASTIC models were 36–128 and 55–163, respectively. The vulnerable indices increased from inland districts to coastal areas. The Ba Tri and Binh Dai districts were recorded as having very high vulnerability to salinization, while the Chau Thanh and Cho Lach districts were at a low vulnerability level. From the comparative analysis of the two models, it is obvious that the modified DRASTIC model with the inclusion of a river or canal network and agricultural practices factors enables better performance than the generic DRASTIC model. This enhancement is explained by the significant impact of anthropogenic activities on the salinization of soil water content. This study’s results can be used as scientific implications for planners and decision-makers in river catchment and land-use management practices.

show abstract

Section: Introductionmentioning

confidence: 99%

Estimating Soil Water Susceptibility to Salinization in the Mekong River Delta Using a Modified DRASTIC Model

Tran

et al. 2021

Water

View full text Add to dashboard Cite

show abstract

“…The increase in EC and salt levels in the soil solution by applying CS and AS has been previously documented (Dunlop et al, 2019;Havlin et al, 1999;Machado et al, 2014;Mao et al, 2016;Vargas et al, 2015). However, many of these studies did not investigate the implications of application rates of CS and AS on the exchangeable cations in soils with high Na + content or those subjected to saline water irrigation, as in northeast Florida.…”

Section: Introductionmentioning

confidence: 97%

“…In the past 8 years, most of the growers have abandoned fertilizer broadcasting practices for more efficient application techniques such as banding of granular fertilizer or localized application of liquid fertilizers using knife applicator. Fertilizers with a high salt index can lead to an increase in soil EC with cations such as Ca 2+ , Mg 2+ and sodium (Na + ) and anions such as chloride (Cl¯), SO 4 2¯, bicarbonate (HCO 3¯) , and carbonate (CO 3 2¯) (Dunlop et al, 2019;Havlin et al, 1999;Mao et al, 2016;Vargas et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Applications of Gypsum and Ammonium Sulfate Change Soil Chemical Properties of a Salt-Affected Agricultural Soil

Buck¹,

Castro²,

Mattiello³

et al. 2020

JAS

View full text Add to dashboard Cite

Irrigation water with high electrical conductivity (EC) compromises the sustainability of agricultural soils. Calcium sulfate (CS) or gypsum is commonly used on removal of soluble ions such as sodium (Na), however, large applications of CS can affect soil pH, EC, and nutrient availability to plants. The objective of this study was to investigate the effects of CS and ammonium sulfate (AS) rates on the soil pH, EC, and exchangeable cations in a salt-affected agricultural soil. Samples from the 0-20 cm soil depth layer were collected from an agricultural soil reported to have low potato yield due to high EC irrigation water. Soil was incubated with rates ranging from 0 to 4000 kg ha-1 of CS and 0 to 600 kg ha-1 of nitrogen (N) using AS. The treated soil was incubated for 60 d at 25 ºC and moisture was maintained at 60% of soil field capacity. After incubation, the soil was analyzed for pH, EC, Na, manganese (Mn), and zinc (Zn). Increasing rates of CS resulted in a small decrease in soil pH and a significant linear increase in soil EC, while the application of AS linearly reduced the soil pH and quadratically increased soil EC. The application rate of 200 kg ha-1 of N as AS resulted in a decrease of soil pH from 5.9 to 5.2, while the EC increased from 1.3 to 3.0 dS m-1. Extractable Na increased linearly with the application of AS due to its effect on the soil pH. The soil extractable Mn and Zn were not affected by the application of CS. Applications of AS resulted in a linear increase in soil extractable Mn and Zn concentrations, respectively. Results from this incubation study suggest that the use of large rates of CS for consecutive years may further impair soil conditions for cropping in areas with high EC in the irrigation water.

show abstract

“…The SEAWAT [14] threedimensional finite difference code by the United States Geological Survey (USGS) is used by many researchers for the investigation of seawater intrusion dynamics, e.g., refs. [15][16][17]. The simplest approach of the sharp interface with the SWI2 package of MODFLOW [18] is also utilized, while other researchers have applied the MODFLOW and MT3DMS [19] codes to simulate seawater encroachment on the mainland [20].…”

Section: Introductionmentioning

confidence: 99%

Groundwater Flow Model Calibration Using Variable Density Modeling for Coastal Aquifer Management

Perdikaki,

Chrysanthopoulos,

Markantonis

et al. 2024

Hydrology

View full text Add to dashboard Cite

The paper investigates the mechanism of seawater intrusion and the performance of free and open-source codes for the simulation of variable density flow problems in coastal aquifers. For this purpose, the research focused on the Marathon Watershed, located in the northeastern tip of Attica, Greece. For the simulation of the groundwater system, MODFLOW, MT3DMS and SEAWAT codes were implemented, while sensitivity analysis and calibration processes were carried out with UCODE. Hydraulic head calibration was performed on the MODFLOW model, and TDS concentration was validated in the SEAWAT model. The calibrated parameters of the MODFLOW model were obtained for the variable density flow simulation with SEAWAT. The MODFLOW and SEAWAT hydraulic head outputs were analyzed and compared to one another. The outcome of this analysis is that SEAWAT produced slightly better results in terms of the hydraulic heads, concluding that parameter transferability can take place between the two models. For the purpose of the seawater intrusion assessment, the use of the SEAWAT code revealed that the aquifer is subjected to passive and passive–active seawater intrusion during wet and dry seasons, respectively. Finally, an irregular shape of a saltwater wedge is developed at a specific area associated with the hydraulic parameters of the aquifer.

show abstract

Simulation of saltwater intrusion into coastal aquifer of Nagapattinam in the lower cauvery basin using SEAWAT

Cited by 27 publications

References 3 publications

Estimating Soil Water Susceptibility to Salinization in the Mekong River Delta Using a Modified DRASTIC Model

Estimating Soil Water Susceptibility to Salinization in the Mekong River Delta Using a Modified DRASTIC Model

Applications of Gypsum and Ammonium Sulfate Change Soil Chemical Properties of a Salt-Affected Agricultural Soil

Groundwater Flow Model Calibration Using Variable Density Modeling for Coastal Aquifer Management

Contact Info

Product

Resources

About