L’INDICE DI QUALITA’ MORFOLOGICA (IQM) PER LA VALUTAZIONE E LA CLASSIFICAZIONE IDROMORFOLOGICA DEI CORSI D’ACQUA — IJEGE
 
 
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THE MORPHOLOGICAL QUALITY INDEX (IQM) FOR STREAM EVALUATION AND HYDROMORPHOLOGICAL CLASSIFICATION



Abstract:
The general structure of a new methodology, named IDRAIM (sistema IDRomorfologico di valutazione, AnalisI e Monitoraggio dei corsi d’acqua), aimed at a hydromorphological assessment and analysis of streams is presented. In particular, a stream Morphological Quality Index (IQM) developed for the hydromorphological classification required by the European Water Framework Directive 2000/60/EC (WFD) is illustrated. The methodological approach is based on integration of field surveys with remote sensing and GIS analyses. The complete procedure is composed by three parts: initial setting and classification; evaluation of the present morphological state; and monitoring. The initial classification is mainly based on catchment physiographic conditions, channel confinement and morphology. The evaluation of present morphological conditions is carried out by using a series of forms allowing a guided analysis of the following aspects: (a) longitudinal and lateral continuity; (b) channel pattern; (c) crosssectional configuration; (d) bed structure and substrate; and (e) vegetation in the riparian corridor. The analysis is carried out with reference to the foregoing five aspects by three components: (1) geomorphic functionality; (2) artificiality; (3) channel changes. A scoring system is used to obtain a Morphological Alteration Index (IAM) and a Morphological Quality Index (IQM). It is proposed that the two indices will allow to classify the morphological conditions of a stream. The monitoring phase should then allow for a future assessment of possible variations of the present morphological conditions.

Authors:
Massimo Rinaldi - Università degli Studi di Firenze - Dipartimento di Ingegneria Civile e Ambientale
Nicola Surian - Università degli Studi di Padova - Dipartimento di Geografia
Francesco Comiti - Libera Università di Bolzano - Facoltà di Scienze e Tecnologie
Martina Bussettini - Istituto Superiore per la Protezione e la Ricerca Ambientale (IS PRA ), Roma
Keywords
stream Morphological Quality Index, hydromorphology, Water Framework Directive, morphological assessment, IDRAIM
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