Senio watershed synthesizes the typical asset of an Apennine basin: a dominant clayey lithology, high hydrogeological and desertification risks, intensive agriculture. Senio is a torrential stream and its flow, in the summer period, is extremely poor. In the early XX century an intense activity of land reclamation led to the realization of a great number of engineering works for soil defence and water storage. During the last twenty years many little reservoirs (100.000 m3) have been realized but they are no longer able to satisfy local water demand, which has risen exponentially due to introduction of kiwi farming (actinidia) against grapevine and orchard ones; as a consequence, there is a water deficit of about 1.500.000 m3 per year. This situation has a strong negative effect on the whole environment, especially on the minimum river flow, and is a limiting factor to a sustainable development of society. Aim of the study is to compare present-day catchment budget for the Senio Torrent with an estimate of the 1972-catchment budget, knowing that the most important water resources are represented by natural water streams and hill reservoirs. Through aerial and satellite images, reservoirs have been analysed for the years 1972 and 2003, along with green cover and soil use. Results show how, in the '70s, reservoirs had mainly a hydraulic regulation purpose; through years, with moving of the population down valley, reservoirs moved to valley bottom, changed both in size and building characteristics in order to sustain the growing irrigation demands from the new coppices and crop fields. Various hypothesis have been considered in order to reduce the risk of desertification: - Water demand reduction; - Optimisation of water management; - Increase of water storage through realization of new reservoirs and other hydraulic works, to the purpose of cover current water balance deficit.
Donatella Pavanelli, C. Cavazza, S.Correggiari, A. Bigi, M. Rigotti (2006). Analysis of soil use dynamics (1972-2003) in an apennines basin: impacts on the hydrologic budget, on the characteristics of reservoir and on the landscape setting.. BOCHUM : s.n.
Analysis of soil use dynamics (1972-2003) in an apennines basin: impacts on the hydrologic budget, on the characteristics of reservoir and on the landscape setting.
PAVANELLI, DONATELLA;CAVAZZA, CLAUDIO;BIGI, ALESSANDRO;RIGOTTI, MARCO
2006
Abstract
Senio watershed synthesizes the typical asset of an Apennine basin: a dominant clayey lithology, high hydrogeological and desertification risks, intensive agriculture. Senio is a torrential stream and its flow, in the summer period, is extremely poor. In the early XX century an intense activity of land reclamation led to the realization of a great number of engineering works for soil defence and water storage. During the last twenty years many little reservoirs (100.000 m3) have been realized but they are no longer able to satisfy local water demand, which has risen exponentially due to introduction of kiwi farming (actinidia) against grapevine and orchard ones; as a consequence, there is a water deficit of about 1.500.000 m3 per year. This situation has a strong negative effect on the whole environment, especially on the minimum river flow, and is a limiting factor to a sustainable development of society. Aim of the study is to compare present-day catchment budget for the Senio Torrent with an estimate of the 1972-catchment budget, knowing that the most important water resources are represented by natural water streams and hill reservoirs. Through aerial and satellite images, reservoirs have been analysed for the years 1972 and 2003, along with green cover and soil use. Results show how, in the '70s, reservoirs had mainly a hydraulic regulation purpose; through years, with moving of the population down valley, reservoirs moved to valley bottom, changed both in size and building characteristics in order to sustain the growing irrigation demands from the new coppices and crop fields. Various hypothesis have been considered in order to reduce the risk of desertification: - Water demand reduction; - Optimisation of water management; - Increase of water storage through realization of new reservoirs and other hydraulic works, to the purpose of cover current water balance deficit.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
