The Importance of Data Acquisition Techniques in Saltwater Intrusion Monitoring

Springer Science and Business Media LLC - Tập 26 - Trang 2851-2866 - 2012
M. Mastrocicco1, B. M. S. Giambastiani1, P. Severi2, N. Colombani1,3
1Earth Sciences Department, University of Ferrara, Ferrara, Italy
2Geological, Seismic and Soil Survey, Emilia Romagna Region, Bologna, Italy
3CIRSA – Interdepartmental Centre for Environmental Sciences Research, University of Bologna, Ravenna, Italy

Tóm tắt

A detailed vertical characterization of a coastal aquifer was performed along a flow path to monitor the seawater intrusion. Physico-chemical logs were obtained by both open-borehole logging (OBL) and multilevel sampling technique (MLS) via straddle packers in piezometers penetrating the coastal aquifer of the Po River Delta, Italy. The open borehole logs led to a satisfactory reconstruction of the extent of the fresh-saltwater interface but provided a misleading characterization of the distribution of redox environments within the aquifer. On the contrary, good fits between sedimentological, stratigraphycal and physico-chemical data were obtained using the straddle packers devices. This study demonstrates that, within coastal shallow aquifers evenly recharged by irrigation canals, the simple and economical OBL technique can lead to misleading results when used to characterize density dependent groundwater stratification but is deemed adequate for preliminary assessments of the saltwater wedge location.

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