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Sea Water Intrusion (sea + water_intrusion)

Distribution by Scientific Domains
Engineering100%

Selected Abstracts

Remediation of Sea Water Intrusion: A Case Study

GROUND WATER MONITORING & REMEDIATION, Issue 3 2001
Ioannis K. Tsanis
Sea water intrusion and remediation in the Upper Floridan Aquifer in South Carolina is simulated using the finite-element model SUTRA developed by the U.S. Geological Survey. A sensitivity analysis of the effect of the hydrogeologic parameters on the sea water recharge and seepage velocities is performed. An increase in confining unit and/or in aquifer conductivity results in an increase of the sea water recharge. An increase in aquifer porosity results in a decrease of the sea water recharge. Among the three remedial techniques simulated,reduced aquifer withdrawals, an injection well, and a combined injection and capture well,the reduced aquifer withdrawals and injection well are the best methods for preventing sea water intrusion. [source]

Hydrogeological and Hydrogeochemical Studies for Salt Water Intrusion on the South Coast of Laizhou Bay, China

GROUND WATER, Issue 1 2000
Yuqun Xue
Sea water intrusion has occurred on the east and southeast coasts of Laizhou Bay, China, since the 1970s (Wu et al. 1993). In 1981, on the adjacent south coast, the intrusion of salt water originating from brine was observed. In this area, the salt water intrusion was caused by the excessive pumping of fresh water in aquifers. Moreover, the simultaneous pumping of fresh water and salt water/brine formed a complicated ground water flow field. The data obtained from observation wells were used to analyze the origin of the salt water and brine, and the genesis of the bicarbonate/sodium water zone. All data suggest that the brine originated from ancient sea water, and that the bicarbonate/sodium water was formed by cation exchange. The variations of chemical compositions along representative flowpaths and the relationships between such variations and salt water intrusion were also discussed. [source]

Remediation of Sea Water Intrusion: A Case Study

GROUND WATER MONITORING & REMEDIATION, Issue 3 2001
Ioannis K. Tsanis
Sea water intrusion and remediation in the Upper Floridan Aquifer in South Carolina is simulated using the finite-element model SUTRA developed by the U.S. Geological Survey. A sensitivity analysis of the effect of the hydrogeologic parameters on the sea water recharge and seepage velocities is performed. An increase in confining unit and/or in aquifer conductivity results in an increase of the sea water recharge. An increase in aquifer porosity results in a decrease of the sea water recharge. Among the three remedial techniques simulated,reduced aquifer withdrawals, an injection well, and a combined injection and capture well,the reduced aquifer withdrawals and injection well are the best methods for preventing sea water intrusion. [source]

Inverse Modeling of Coastal Aquifers Using Tidal Response and Hydraulic Tests

GROUND WATER, Issue 6 2007
Andrés Alcolea
Remediation of contaminated aquifers demands a reliable characterization of hydraulic connectivity patterns. Hydraulic diffusivity is possibly the best indicator of connectivity. It can be derived using the tidal response method (TRM), which is based on fitting observations to a closed-form solution. Unfortunately, the conventional TRM assumes homogeneity. The objective of this study was to overcome this limitation and use tidal response to identify preferential flowpaths. Additionally, the procedure requires joint inversion with hydraulic test data. These provide further information on connectivity and are needed to resolve diffusivity into transmissivity and storage coefficient. Spatial variability is characterized using the regularized pilot points method. Actual application may be complicated by the need to filter tidal effects from the response to pumping and by the need to deal with different types of data, which we have addressed using maximum likelihood methods. Application to a contaminated artificial coastal fill leads to flowpaths that are consistent with the materials used during construction and to solute transport predictions that compare well with observations. We conclude that tidal response can be used to identify connectivity patterns. As such, it should be useful when designing measures to control sea water intrusion. [source]

Remediation of Sea Water Intrusion: A Case Study

GROUND WATER MONITORING & REMEDIATION, Issue 3 2001
Ioannis K. Tsanis
Sea water intrusion and remediation in the Upper Floridan Aquifer in South Carolina is simulated using the finite-element model SUTRA developed by the U.S. Geological Survey. A sensitivity analysis of the effect of the hydrogeologic parameters on the sea water recharge and seepage velocities is performed. An increase in confining unit and/or in aquifer conductivity results in an increase of the sea water recharge. An increase in aquifer porosity results in a decrease of the sea water recharge. Among the three remedial techniques simulated,reduced aquifer withdrawals, an injection well, and a combined injection and capture well,the reduced aquifer withdrawals and injection well are the best methods for preventing sea water intrusion. [source]

Stack unit mapping of coastal aquifer to predict and control sea water intrusion using remote sensing and a geographical information system

HYDROLOGICAL PROCESSES, Issue 17 2003
J. Moses Edwin
Abstract Aquifers are inherently susceptible to contamination and coastal aquifers in specific are highly vulnerable to sea water intrusion. For efficient planning and management of coastal aquifers in Kayalpattu and Tiruchopuram villages, which extend over 4·05 km2, it is essential to delineate and predict the extent of intrusion into the shallow aquifer. Management of ground water in coastal aquifers is composed of major elements that should be properly evaluated, and special attention is given to the sea water intrusion problem. Different data, like hydro-geomorphological and depth-wise iso-apparent resistivity, are integrated spatially using a geographical information system. The stack-unit mapping approach is used to delineate the zones with iso-apparent resistivity of less than 10 , m have been found to be increasing in areal extent with reference to depth. Copyright © 2003 John Wiley & Sons, Ltd. [source]