Fonctionnement d’un petit aquifère volcano-sédimentaire bénéficiant de l’excédent d’eaux d’irrigation: La Aldea, Grande Canarie, Iles Canaries (Espagne) Comportamiento de un pequeño acuífero vulcano-sedimentario recargado por retornos de riego: La Aldea, Gran Canaria, Islas Canarias (España) 接受灌溉回流的小型沉积火山岩含水层特性:(西班牙) 那利群岛大 那利岛La Aldea地区 Comportamento de um pequeno aquífero vulcânico sedimentar que recebe fluxo de retorno de irrigação: La Aldea, Grande Canária, Ilhas Canárias (Espanha)

In many arid and semi-arid areas, intensive cultivation is practiced despite water commonly being a limiting factor. Often, irrigation water is from local aquifers or imported from out-of-area aquifers and surface reservoirs. Irrigation return flows become a significant local recharge source, but th...

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Bibliographic Details
Published in:Hydrogeology journal 2014, Vol.22 (4), p.865-882
Main Authors: Cruz-Fuentes, T, Heredia, J, Cabrera, M. C, Custodio, E
Format: Article
Language:English
Subjects:
alluvium
aquifers
groundwater
irrigation water
mathematical models
rain
semiarid zones
water management
water quality
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Summary:In many arid and semi-arid areas, intensive cultivation is practiced despite water commonly being a limiting factor. Often, irrigation water is from local aquifers or imported from out-of-area aquifers and surface reservoirs. Irrigation return flows become a significant local recharge source, but they may deteriorate aquifer water quality. La Aldea valley, located in the western sector of Gran Canaria Island (Atlantic Ocean), is a coastal, half-closed depression in altered, low-permeability volcanics with alluvium in the gullies and scree deposits over a large part of the area. This area is intensively cultivated. Irrigation water comes from reservoirs upstream and is supplemented (average 30 %) by local groundwater; supplementation goes up to 70 % in dry years, in which groundwater reserves are used up to exhaustion if the dry period persists. Thus, La Aldea aquifer is key to the water-supply system, whose recharge is mostly from return irrigation flows and the scarce local rainfall recharge on the scree formations, conveyed to the gully deposits. To quantify the hydrogeological conceptual model and check data coherence, a simplified numerical model has been constructed, which can be used as a tool to help in water management.
ISSN:1431-2174
1435-0157