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Titolo:
Use of historical and geospatial data to guide the restoration of a Lake Erie coastal marsh
Autore:
Kowalski, KP; Wilcox, DA;
Indirizzi:
US Geol Survey, Great Lakes Sci Ctr, Ann Arbor, MI 48105 USA US Geol Survey Ann Arbor MI USA 48105 es Sci Ctr, Ann Arbor, MI 48105 USA
Titolo Testata:
WETLANDS
fascicolo: 4, volume: 19, anno: 1999,
pagine: 858 - 868
SICI:
0277-5212(199912)19:4<858:UOHAGD>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
AERIAL PHOTOGRAPHS; VEGETATION; LEVEL; INFORMATION;
Keywords:
barrier beach; coastal marsh; geographic information system; GIS; historical; Lake Erie; littoral drift; management; restoration; Typha; water levels;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
54
Recensione:
Indirizzi per estratti:
Indirizzo: Kowalski, KP US Geol Survey, Great Lakes Sci Ctr, 1451 Green Rd, Ann Arbor, MI 48105 USA US Geol Survey 1451 Green Rd Ann Arbor MI USA 48105 48105 USA
Citazione:
K.P. Kowalski e D.A. Wilcox, "Use of historical and geospatial data to guide the restoration of a Lake Erie coastal marsh", WETLANDS, 19(4), 1999, pp. 858-868

Abstract

Historical and geospatial data were used to identify the relationships between water levels, wetland vegetation, littoral drift of sediments, and thecondition of a protective barrier beach at Metzger Marsh, a coastal wetland in western Lake Erie, to enhance and guide a joint federal and state wetland restoration project. Eleven sets of large-scale aerial photographs dating from 1940 through 1994 were interpreted to delineate major vegetation types and boundaries of the barrier beach. A geographic information system (GIS) was then used to digitize the data and calculate the vegetated area andlength of barrier beach. Supplemented by paleoecological and sedimentological analyses, aerial photographic interpretation revealed that Metzger Marsh was once a drowned-river-mouth wetland dominated by sedges and protected by a sand barrier beach. Extremely high water levels, storm events, and reduction of sediments in the littoral drift contributed to the complete destruction of the barrier beach in 1973 and prevented its recovery. The extent of wetland vegetation, correlated to water levels and condition of the barrier beach, decreased from a high of 108 ha in 1940 to a low of 33 ha in 1994. The lack of an adequate sediment supply and low probability of a period of extremely low lake levels in the near future made natural reestablishment of the barrier beach and wetland vegetation unlikely. Therefore, the federal and state managers chose to construct a dike to replace the protective barrier beach. Recommendations stemming from this historical analysis, however, resulted in the incorporation of a water-control structure In the dikethat will retain a hydrologic connection between wetland and lake. Management of the wetland will seek to mimic processes natural to the wetland typeidentified by this analysis.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 09/07/20 alle ore 13:40:38