Hydrodynamic parameters estimation from self-potential data in a controlled full scale site

JOURNAL OF HYDROLOGY

卷:522

Article

Chidichimo, Francesco¹  De Biase, Michele^2,3  Rizzo, Enzo²  Masi, Salvatore³  Straface, Salvatore^1,2 

[1] Univ Calabria, Dept Environm & Chem Engn, I-87036 Arcavacata Di Rende, CS, Italy

[2] CNR IMAA, Hydrogeosite Lab, I-85052 Marsico Nuovo, PZ, Italy

[3] Univ Basilicata, Sch Engn, I-85100 Potenza, PZ, Italy

关键词: Porous medium characterization;    Hydrogeophysics;    Multi-physical inverse modeling;    Self-potential;    Pumping test;   

DOI  :  10.1016/j.jhydrol.2015.01.022

来源: Elsevier

【 摘 要 】

A multi-physical approach developed for the hydrodynamic characterization of porous media using hydrogeophysical information is presented. Several pumping tests were performed in the Hydrogeosite Laboratory, a controlled full-scale site designed and constructed at the CNR-IMAA (Consiglio Nazionale delle Ricerche - Istituto di Metodologia per l'Analisi Ambientale), in Marsico Nuovo (Basilicata Region, Southern Italy), in order to obtain an intermediate stage between laboratory experiments and field survey. The facility consists of a pool, used to study water infiltration processes, to simulate the space and time dynamics of subsurface contamination phenomena, to improve and to find new relationship between geophysical and hydrogeological parameters, to test and to calibrate new geophysical techniques and instruments. Therefore, the Hydrogeosite Laboratory has the advantage of carrying out controlled experiments, like in a flow cell or sandbox, but at field comparable scale. The data collected during the experiments have been used to estimate the saturated hydraulic conductivity k(s), [ms(-1)] using a coupled inversion model working in transient conditions, made up of the modified Richards equation describing the water flow in a variably saturated porous medium and the Poisson equation providing the self-potential phi [V], which naturally occurs at points of the soil surface owing to the presence of an electric field produced by the motion of underground electrolytic fluids through porous systems. The result obtained by this multi-physical numerical approach, which removes all the approximations adopted in previous works, makes a useful instrument for real heterogeneous aquifer characterization and for predictive analysis of its behavior. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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