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Runoff coefficient and average yearly natural aquifer recharge assessment by physiography-based indirect methods for the island of Sardinia (Italy) and its NW area (Nurra)

Ghiglieri, Giorgio and Carletti, Alberto and Pittalis, Daniele (2014) Runoff coefficient and average yearly natural aquifer recharge assessment by physiography-based indirect methods for the island of Sardinia (Italy) and its NW area (Nurra). Journal of hydrology, Vol. 519 (Part B), p. 1779-1791. ISSN 0022-1694. eISSN 1879-2707. Article.

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DOI: 10.1016/j.jhydrol.2014.09.054

Abstract

Runoff estimation and water budget in ungauged basins is a challenge for hydrological researchers and planners.
The principal aim of this study was the application and validation of the Kennessey method, which is a physiography-based indirect process for determining the average annual runoff coefficient and the basin-scale water balance. The coefficient can be calculated using specific physiographic characteristics (slope, permeability and vegetation cover) and a parameter that defines climatic conditions and does not require instrumental data. One of the main purposes of this study was to compare the average annual runoff coefficient obtained using the Kennessey method with the coefficients calculated using data from 30 instrumented drainage basins in Sardinia (Italy) over 71 years (from 1922 to 1992). These measurements represent an important and complete historical dataset from the study area. Using the runoff coefficient map, the method was also applied to assess the effective annual recharge rate of the aquifers of the Calich hydrogeological basin in the Nurra Plain (Alghero, NW Sardinia-Italy). The groundwater recharge rate was compared with rates calculated using the standard water balance method. The implementation of the method at the regional and basin scales was supported by GIS analyses. The results of the method are promising but show some discrepancies with other methodologies due to the higher weights given to the physiographic parameters than to the meteorological parameters. However, even though the weights assigned to the parameters require improvements, the Kennessey method is a useful tool for evaluating hydrologic processes, particularly for water management in areas where instrumental data are not available.

Item Type:Article
ID Code:10674
Status:Published
Refereed:Yes
Uncontrolled Keywords:Runoff coefficient, hydrogeology, G.I.S., water management, desertification, Sardinia, Italy
Subjects:Area 04 - Scienze della terra > GEO/05 Geologia applicata
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze della Natura e del Territorio
Publisher:Elsevier
ISSN:0022-1694
eISSN:1879-2707
Deposited On:22 Jan 2015 12:01

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