Emergy is a thermodynamics-based entity that enables the implementation of a holistic environmental accounting system. It contributes to identify and measure all the inputs (energy and matter) supporting a given system, expressed in a common unit, namely solar emergy joule (sej). The emergy per unit product (called unit emergy value, UEV), is a measure of the environmental cost of a given resource. It is specific of the system/process and gives information on the dynamics, components and functioning of it. This paper presents the emergy evaluation of water resources within the watershed of the river Sieve, located in the Province of Florence (Italy). Along the river, an artificial basin has been created by means of a dam to preserve water quantity and quality, and to protect the Florentine area from dangerous floods and inundations. Different UEVs of water can be identified along the course of the river, especially upstream and downstream of the dam. These values quantify both the environmental and human efforts made to ensure and regulate the presence of water at different points of the river. The UEV of water flowing in the river increases from 1.35×105sej/g upstream, to 5.80×105sej/g downstream of the dam, depending mainly on man-made infrastructure. Along the watershed, three different systems of extraction, purification and distribution of water have been chosen on the basis of their dimension, type and location. UEVs of water distributed and the emergy investment necessary to implement different water management strategies are presented. The value of water purified and distributed decreases from 2.00×106sej/g for the smallest plant in the mountainous area, to 1.72×106sej/g for the largest plant, in the city of Florence, depending on production efficiency. © 2011 Elsevier B.V.

Pulselli, F.M., Patrizi, N., & Focardi, S. (2011). Calculation of the Unit Emergy Value of Water in an Italian Watershed. ECOLOGICAL MODELLING, 222(16), 2929-2938 [10.1016/j.ecolmodel.2011.04.021].

Calculation of the Unit Emergy Value of Water in an Italian Watershed

PULSELLI, F. M.;PATRIZI, N.;FOCARDI, S.
2011

Abstract

Emergy is a thermodynamics-based entity that enables the implementation of a holistic environmental accounting system. It contributes to identify and measure all the inputs (energy and matter) supporting a given system, expressed in a common unit, namely solar emergy joule (sej). The emergy per unit product (called unit emergy value, UEV), is a measure of the environmental cost of a given resource. It is specific of the system/process and gives information on the dynamics, components and functioning of it. This paper presents the emergy evaluation of water resources within the watershed of the river Sieve, located in the Province of Florence (Italy). Along the river, an artificial basin has been created by means of a dam to preserve water quantity and quality, and to protect the Florentine area from dangerous floods and inundations. Different UEVs of water can be identified along the course of the river, especially upstream and downstream of the dam. These values quantify both the environmental and human efforts made to ensure and regulate the presence of water at different points of the river. The UEV of water flowing in the river increases from 1.35×105sej/g upstream, to 5.80×105sej/g downstream of the dam, depending mainly on man-made infrastructure. Along the watershed, three different systems of extraction, purification and distribution of water have been chosen on the basis of their dimension, type and location. UEVs of water distributed and the emergy investment necessary to implement different water management strategies are presented. The value of water purified and distributed decreases from 2.00×106sej/g for the smallest plant in the mountainous area, to 1.72×106sej/g for the largest plant, in the city of Florence, depending on production efficiency. © 2011 Elsevier B.V.
Pulselli, F.M., Patrizi, N., & Focardi, S. (2011). Calculation of the Unit Emergy Value of Water in an Italian Watershed. ECOLOGICAL MODELLING, 222(16), 2929-2938 [10.1016/j.ecolmodel.2011.04.021].
File in questo prodotto:
File Dimensione Formato  
Pulselli et al., 2011.pdf

non disponibili

Tipologia: Post-print
Licenza: NON PUBBLICO - Accesso privato/ristretto
Dimensione 894.82 kB
Formato Adobe PDF
894.82 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11365/11000
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo