Geomorphic units are the elementary spatial physical features of the river mosaic at the reach scale that are nested within the overall hydromorphological structure of a river and its catchment. Geomorphic units also con- stitute the template of physical habitats for the biota. The assessment of river hydromorphological conditions is required by the European Water Framework Directive 2000/60 (WFD) for the classification and monitoring of water bodies and is useful for establishing links between their physical and biological conditions. The spatial scale of geomorphic units, incorporating their component elements and hydraulic patches, is the most appropri- ate to assess these links. Given the weakness of existing methods for the characterisation and assessment of geo- morphic units and physical habitats (e.g., lack of a well-defined spatiotemporal framework, terminology issues, etc.), a new system for the survey and characterisation of river geomorphic units is needed that fits within a geomorphologically meaningful framework. This paper presents a system for the survey and classification of geomorphic units (GUS, geomorphic units survey and classification system) aimed at characterising physical habitats and stream morphology. The method is em- bedded into a multiscale, hierarchical framework for the analysis of river hydromorphological conditions. Three scales of geomorphic units are considered (i.e., macro-units, units, sub-units), organised within two spatial do- mains (i.e., bankfull channel and floodplain). Different levels of characterisation can be applied, depending on the aims of the survey: broad, basic, and detailed level. At each level, different, complementary information is col- lected. The method is applied by combining remote sensing analysis and field survey, according to the spatial scale and the level of description required. The method is applicable to most of fluvial conditions, and has been designed to be flexible and adaptable according to the objectives (e.g., reach characterisation, assessment, mon- itoring) and available data (e.g., image resolution). The method supports integrated hydromorphological assess- ment at the reach scale (e.g., the Morphological Quality Index, MQI) and therefore contributes to better establishing links between hydromorphological conditions at the reach scale, characteristic geomorphic units, and related biological conditions.

Characterising physical habitats and fluvial hydromorphology: A new system for the survey and classification of river geomorphic units / Belletti, Barbara*; Rinaldi, Massimo; Bussettini, Martina; Comiti, Francesco; Gurnell, Angela M.; Mao, Luca; Nardi, Laura; Vezza, Paolo. - In: GEOMORPHOLOGY. - ISSN 0169-555X. - STAMPA. - 283:(2017), pp. 143-157. [10.1016/j.geomorph.2017.01.032]

Characterising physical habitats and fluvial hydromorphology: A new system for the survey and classification of river geomorphic units

Belletti, Barbara;Rinaldi, Massimo;Bussettini, Martina;Nardi, Laura;
2017

Abstract

Geomorphic units are the elementary spatial physical features of the river mosaic at the reach scale that are nested within the overall hydromorphological structure of a river and its catchment. Geomorphic units also con- stitute the template of physical habitats for the biota. The assessment of river hydromorphological conditions is required by the European Water Framework Directive 2000/60 (WFD) for the classification and monitoring of water bodies and is useful for establishing links between their physical and biological conditions. The spatial scale of geomorphic units, incorporating their component elements and hydraulic patches, is the most appropri- ate to assess these links. Given the weakness of existing methods for the characterisation and assessment of geo- morphic units and physical habitats (e.g., lack of a well-defined spatiotemporal framework, terminology issues, etc.), a new system for the survey and characterisation of river geomorphic units is needed that fits within a geomorphologically meaningful framework. This paper presents a system for the survey and classification of geomorphic units (GUS, geomorphic units survey and classification system) aimed at characterising physical habitats and stream morphology. The method is em- bedded into a multiscale, hierarchical framework for the analysis of river hydromorphological conditions. Three scales of geomorphic units are considered (i.e., macro-units, units, sub-units), organised within two spatial do- mains (i.e., bankfull channel and floodplain). Different levels of characterisation can be applied, depending on the aims of the survey: broad, basic, and detailed level. At each level, different, complementary information is col- lected. The method is applied by combining remote sensing analysis and field survey, according to the spatial scale and the level of description required. The method is applicable to most of fluvial conditions, and has been designed to be flexible and adaptable according to the objectives (e.g., reach characterisation, assessment, mon- itoring) and available data (e.g., image resolution). The method supports integrated hydromorphological assess- ment at the reach scale (e.g., the Morphological Quality Index, MQI) and therefore contributes to better establishing links between hydromorphological conditions at the reach scale, characteristic geomorphic units, and related biological conditions.
2017
283
143
157
Belletti, Barbara*; Rinaldi, Massimo; Bussettini, Martina; Comiti, Francesco; Gurnell, Angela M.; Mao, Luca; Nardi, Laura; Vezza, Paolo
File in questo prodotto:
Non ci sono file associati a questo prodotto.

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

Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/1125781
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 111
  • ???jsp.display-item.citation.isi??? 101
social impact