There seems to be quite a bit of research on managing salt-water intrusion through managed aquifer recharge (MAR), but what about impacts on groundwater fed saline coastal lakes through managed aquifer recharge? The lakes I am researching are in south-western Australia, hypersaline and groundwater-dependent (essentially groundwater sinks), receiving very little runoff, and having high evaporation during summer causing seasonal changes to the lakes. It is likely that increasing freshwater inputs through MAR can essentially cause a community shift from saline tolerant species to more freshwater wetland species, as well as potentially altering lake/groundwater levels due to changes in density, but has this been empirically demonstrated anywhere?
I only want to remind you that if the biota of the lakes changes some ecologists might accuse you of causing extinction of saline water biota in this place. At least if it is unique.
kindly refer :
Improvement of groundwater quality due to fresh water ingress in Potharlanka Island , Krishna delta, India by NCMondal, VSSingh,VKsaxena and RKPrasad, Environmental Geology, Aug. 2008.
+ Various related papers published by National Geophysical Research Institute Hyderabad .
Perhaps this might help: A comparison of the coupled fresh water-salt water flow and the Ghyben-Herzberg sharp interface approaches to modeling of transient behavior in coastal aquifer systems
Journal of Hydrology
By:
H.I. Essaid
In all cases where there is a direct linkage between the fresh water aquifer and the saline lake, Baden Ghyben-Herzberg lens will prevail. Somewhat curious, have salinity readings been taken at various depths of the lakes in question?
Thank you all for the responses, very helpful. The lakes themselves are quite shallow, maximum depth of approximately 3m, and have a very large hypersaline plume of groundwater beneath them (e.g. 40,000 to 60,000 mg/L TDS). The lakes fluctuate in salinity with the seasons (between 8,000 mg/L to 90,000 mg/L TDS - more saline during summer months when the lakes evaporate, lowest during September October when fresh groundwater percolates into the lakes from the east).
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