Coastal Hydrogeology

Jiao, Jiu Jimmy; Post, Vincent

doi:10.1017/9781139344142

Cited by 81 publications

(103 citation statements)

References 696 publications

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“…Fresh groundwater in shallow unconfined aquifers is an important water resource for many coastal zones worldwide, which, however, are threatened by seawater intrusion. Seawater intrusion can occur in the lateral direction as a result of intensive groundwater abstraction and sea level rise (Ataie‐Ashtiani et al, ; Ketabchi et al, ; Werner et al, ; and references therein), while lateral seawater intrusion has been intensively studied, vertical intrusion process due to coastal flooding events such as tsunamis and storm surges, in fact, can be more significant considering the fast infiltration through a large inundation area (Jiao & Post, ; Mahmoodzadeh & Karamouz, ). This vertical seawater intrusion has received little attention until the occurrence of huge tsunami disasters in 2004 and 2011, which caused long‐lasting contamination of groundwater (Illangasekare et al, ; Nakagawa et al, ).…”

Section: Introductionmentioning

confidence: 99%

Future Risks of Tsunami‐Induced Seawater Intrusion Into Unconfined Coastal Aquifers: Insights From Numerical Simulations at Niijima Island, Japan

Liu

Tokunaga

2019

Water Resources Research

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Tsunami-induced seawater inundation causes vertical seawater infiltration into coastal aquifers and induces unexpected salinization of fresh groundwater resources. Assessing future risks of seawater intrusion in tsunami-prone areas can provide essential information supporting disaster preparedness. In this study, we investigated seawater intrusion and aquifer recovery processes under the future Nankai earthquake and tsunami scenarios at Niijima Island, Japan. A groundwater model with a 2-D vertical cross section was developed to solve variable-density flow and salt transport in unsaturatedsaturated media using the numerical code, FEFLOW. Our simulation results indicate that the unsaturated zone behaves as an initial storage of the infiltrated seawater and controls the maximum amount of seawater infiltration during the anticipated tsunami inundation. The bedrock structures affect the direction of seawater movement in the saturated zone and the flushing time of the polluted aquifer. Our analysis suggests that the tsunami inundation height, the rainfall recharge rate, and hydraulic conductivity are the primary sources of uncertainties in the simulation results. These findings have implications for other tsunami-prone zones with respect to the understanding of the relevant physical processes and model uncertainties. Key Points: • Unsaturated zone initially stores infiltrated seawater during tsunami inundation and constrains the mass of infiltrated salt to subsurface • Bedrock structures affect the directions of seawater migration after tsunami inundation because of the contribution of density-driven flow • Tsunami inundation height, rainfall recharge rate, and hydraulic conductivity are the primary sources of model uncertainties Correspondence to:

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Section: Introductionmentioning

confidence: 99%

Future Risks of Tsunami‐Induced Seawater Intrusion Into Unconfined Coastal Aquifers: Insights From Numerical Simulations at Niijima Island, Japan

Liu

Tokunaga

2019

Water Resources Research

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“…The general feature of periodic piezometric head signals from piezometers D1, D2, and D4 was explained via tidal efficiency, TE, and time lag, ∆T. TE, as defined in the previous section, fully corresponded to the definition of [7,46,70], and was interpreted in that manner as the ratio of the standard deviations of the piezometric head inland and sea level, whereas ∆T corresponded to temporal delay of piezometric signal relative to that of the sea level. Following the results in Table 1, D1 was characterized by TE equal to 0.558, whereas ∆T corresponded to 1 h. By going more inland, TE was decreased, whereas ∆T increased to 2 h for D2 and 3 h for D4.…”

Section: Resultsmentioning

confidence: 99%

Hydrogeological Characterization of Coastal Aquifer on the Basis of Observed Sea Level and Groundwater Level Fluctuations: Neretva Valley Aquifer, Croatia

Srzić

Lovrinović

Racetin

et al. 2020

Water

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Hydrogeological data availability is often limited to local areas where usual in situ tests or methods are applied (slug/bail or pumping tests, Electrical Resistivity Tomography (ERT)). Because most problems (e.g., saltwater intrusion mitigation) require problem analysis on larger scales (catchment or sub catchment), hydrogeological identification of global character is preferable. This work leads to the determination of aquifer hydrogeological parameters on the basis of observed sea level, groundwater piezometric head found inland, and barometric pressure. When applied to observed signals, the approach led efficiently to final hydrogeological characterization. After identification of dominant tidal constituents from observed signals, barometric efficiency was successfully determined. Following available information on geological settings, an appropriate conceptual model was applied and updated to count for polychromatic signals. Final determination of hydrogeological parameters relied on root mean square error (RMSE) minimization and led to determination of (i) presence of three stratigraphic units: unconfined sandy aquifer on the top, a confining layer made of clay, and a confined gravel layer; (ii) existence of the clay layer under the sea with a total length of 1400 m; (iii) a clay layer has been identified as confining one by both spectral analysis and determined leakance value; and (iv) estimated confined aquifer specific storage ranging from 2.87 × 10−6 to 4.98 × 10−6 (m−1), whereas hydraulic conductivity ranged from 7.0 × 10−4 to 7.5 × 10−3 (m s−1). Both range intervals corresponded to previous in situ findings conducted within the area of interest.

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“…Coastal Hydrogeology (Jiao and Post ) is a well‐written and comprehensive monograph that is founded in deep understanding and practical experience. Its 12 chapters cover coastal hydrogeochemistry, land reclamation, coastal aquifer management, and the physics and mathematics of coastal groundwater interaction with tides, unsaturated‐zone air, and past and present sea‐level change.…”

mentioning

confidence: 99%

“…The authors' experience with coastal land reclamation, including its sociopolitical aspects, is valuable. In one example, Jiao and Post () point out that the rise of inland water tables due to land reclamation might take decades, and hence the reclamation itself might be forgotten by the time problems crop up. Elsewhere we are reminded that sea‐level change does not occur in isolation from myriad climatic and onshore anthropogenic factors.…”

mentioning

confidence: 99%