Testing alternative conceptual models of seawater intrusion in a coastal aquifer using computer simulation, southern California, USA
Hydrogeology Journal
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Abstract
Two alternative conceptual models of the physical processes controlling seawater intrusion in a coastal basin in California, USA, were tested to identify a likely principal pathway for seawater intrusion. The conceptual models were tested by using a two-dimensional, finite-element groundwater flow and transport model. This pathway was identified by the conceptual model that best replicated the historical data. The numerical model was applied in cross section to a submarine canyon that is a main avenue for seawater to enter the aquifer system underlying the study area. Both models are characterized by a heterogeneous, layered, water-bearing aquifer. However, the first model is characterized by flat-lying aquifer layers and by a high value of hydraulic conductivity in the basal aquifer layer, which is thought to be a principal conduit for seawater intrusion. The second model is characterized by offshore folding, which was modeled as a very nearshore outcrop, thereby providing a shorter path for seawater to intrude. General conclusions are that: 1) the aquifer system is best modeled as a flat, heterogeneous, layered system; 2) relatively thin basal layers with relatively high values of hydraulic conductivity are the principal pathways for seawater intrusion; and 3) continuous clay layers of low hydraulic conductivity play an important role in controlling the movement of seawater.
Suggested Citation
Nishikawa, T., 1997, Testing alternative conceptual models of seawater intrusion in a coastal aquifer using computer simulation, southern California, USA: Hydrogeology Journal, v. 5, no. 3, p. 60-74, https://doi.org/10.1007/s100400050116.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Testing alternative conceptual models of seawater intrusion in a coastal aquifer using computer simulation, southern California, USA |
| Series title | Hydrogeology Journal |
| DOI | 10.1007/s100400050116 |
| Volume | 5 |
| Issue | 3 |
| Publication Date | November 20, 2012 |
| Year Published | 1997 |
| Language | English |
| Publisher | Springer |
| Description | 15 p. |
| First page | 60 |
| Last page | 74 |