| Title | Hydrological regime alteration and ecological flow evaluation in mountain rivers |
| Abstract | In the Alpine region, the hydropower production has caused alterations in the hydrological regime of most rivers, due to the massive withdrawal of water and to the construction of dams and reservoirs, which modify the natural flow duration curve of the river. These alterations may result in a decrease in hydromorphological and ecological quality of the river and limitations are considered, usually expressed as an ecological flow that has to be guaranteed. Many types of approaches are suggested in literature to define this flow, taking into account hydrological, physical, chemical and biological factors. Methods based only on hydraulic/hydrological parameters are often preferred, due to simplicity and robustness. More, with methods based only on hydrological parameters is simpler to take into account changes in river regime due to anthropic activities. However, some ecological issues are also important for river quality, such as the lentic-lotic characteristics of flow, but they are difficult to be expressed in crisp numerical values. In the last years more complex methods have been proposed as an alternative to hydrological models. One of them is the method CARAVAGGIO (Core Assessment of River hAbitat VAlue and hydro-morpholoGIcal cOndition). Although this model is able to take into account a great number of different aspects, its application is not always possible due to the difficulties in entering the river in some sites. In this paper a procedure able to merge the ease of use of hydrological methods and the multi-factor approach of CARAVAGGIO is proposed. Ecological flow is estimated from basic hydrological information, using a simple set of coefficients to take into account other quality issues, particularly the lentic-lotic features of flow regime. Application to a case study in the Province of Verbano-Cusio-Ossola, in the north-western part of Piedmont Region in Italy, is presented. |
| Source | RAVAGE of the Planet IV, Southampton, UK, 1-3 luglio 2015 |
| Keywords | Water resources managementRiver regime alterationsEcological flowLentic-lotic characteristics |
| Year | 2015 |
| Type | Contributo in atti di convegno |
| Authors | Dresti, Claudia and Becciu, Gianfranco and Saidi, Helmi and Ciampittiello, Marzia |
| Text | 373911 2015 ISI Web of Science WOS WOS 000441708900003 Scopus 2 s2.0 85055700619 Water resources management River regime alterations Ecological flow Lentic lotic characteristics Hydrological regime alteration and ecological flow evaluation in mountain rivers Dresti, Claudia and Becciu, Gianfranco and Saidi, Helmi and Ciampittiello, Marzia Milan Polytechnic, CNR ISE In the Alpine region, the hydropower production has caused alterations in the hydrological regime of most rivers, due to the massive withdrawal of water and to the construction of dams and reservoirs, which modify the natural flow duration curve of the river. These alterations may result in a decrease in hydromorphological and ecological quality of the river and limitations are considered, usually expressed as an ecological flow that has to be guaranteed. Many types of approaches are suggested in literature to define this flow, taking into account hydrological, physical, chemical and biological factors. Methods based only on hydraulic/hydrological parameters are often preferred, due to simplicity and robustness. More, with methods based only on hydrological parameters is simpler to take into account changes in river regime due to anthropic activities. However, some ecological issues are also important for river quality, such as the lentic lotic characteristics of flow, but they are difficult to be expressed in crisp numerical values. In the last years more complex methods have been proposed as an alternative to hydrological models. One of them is the method CARAVAGGIO Core Assessment of River hAbitat VAlue and hydro morpholoGIcal cOndition . Although this model is able to take into account a great number of different aspects, its application is not always possible due to the difficulties in entering the river in some sites. In this paper a procedure able to merge the ease of use of hydrological methods and the multi factor approach of CARAVAGGIO is proposed. Ecological flow is estimated from basic hydrological information, using a simple set of coefficients to take into account other quality issues, particularly the lentic lotic features of flow regime. Application to a case study in the Province of Verbano Cusio Ossola, in the north western part of Piedmont Region in Italy, is presented. 4th International Conference on Management of Natural Resources, Sustainable Development and Ecological Hazards C.A. Brebbia 978 1 84564 970 8 Published version https //www.scopus.com/record/display.uri eid=2 s2.0 85055700619 origin=resultslist sort=plf f src=s sid=6244b337df9f43ef51dd3fa871686ccc sot=b sdt=b sl=87 s=TITLE%28Hydrological regime alteration and ecological flow evaluation in mountain rivers%29 relpos=0 citeCnt=1 searchTerm= In RAVAGE of the Planet IV 4th International Conference on Management of Natural Resources, Sustainable Development and Ecological Hazards Southampton, UK, 1 3 luglio 2015 . Proceedings, pp. 23 34. C.A. Brebbia ed. . WIT Press, 2015. RAVAGE of the Planet IV Southampton, UK 1 3 luglio 2015 Internazionale Contributo Capitolo 2015_Capitolo_Dresti_23_34.pdf Contributo in atti di convegno claudia.dresti DRESTI CLAUDIA helmi.saidi SAIDI HELMI marzia.ciampittiello CIAMPITTIELLO MARZIA |
