Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
A GIS-based assessment of potential aquacultural nonpoint source loading in an Atlantic bay (France)
Autore:
Hassen, MB; Prou, J;
Indirizzi:
IFREMER, Ctr Rech Ecol Marine & Aquaculture, CNRS, UMR, F-17137 LHoumeau, France IFREMER LHoumeau France F-17137 ure, CNRS, UMR, F-17137 LHoumeau, France
Titolo Testata:
ECOLOGICAL APPLICATIONS
fascicolo: 3, volume: 11, anno: 2001,
pagine: 800 - 814
SICI:
1051-0761(200106)11:3<800:AGAOPA>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
ATMOSPHERIC DEPOSITION; INORGANIC NITROGEN; TIDAL MARSHES; WATER; GROUNDWATER; ESTUARINE; SEDIMENTS; WETLANDS; POLLUTION; PATTERNS;
Keywords:
aquaculture; earthen ponds; GIS; kriging; land use; network; nitrogen loading; nonpoint source; modeling; phosphorus lending; streams; sub-basin;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: Hassen, MB INSTM, 28 Rue 2 Mars 1934, Tunis 2025, Tunisia INSTM 28 Rue 2 Mars 1934 Tunis Tunisia 2025 unis 2025, Tunisia
Citazione:
M.B. Hassen e J. Prou, "A GIS-based assessment of potential aquacultural nonpoint source loading in an Atlantic bay (France)", ECOL APPL, 11(3), 2001, pp. 800-814

Abstract

Spatial-explicit quantitative dissolved inorganic nitrogen (DIN) and orthophosphorus (OP) loadings were developed from aquatic earthen ponds to the adjacent salt marshes. These loadings were based on water renewal, the concentration of constituents available for all land use, and the spatial positions of constituent sources. Potential loading was assessed at every sub-basin gauge station by adding the individual contribution of every land use polygon. Kriging was also used to spatialize loading from control stations tosalt marshes. A grid of concentration values was established specific to the bay sti earn network using an eight-direction-point model. Analyses showed a more important concentration near intensive activities, from similar to 15 mu mol/L to 30 mu mol/L of DIN and from 2 mu mol/L to 7 mu mol/L of OF. These values decreased rapidly near the ocean, where a dilution of about 75% was noticed for DIN and 87% for OF. Constituent concentrations were quite sensitive to parameter changes, and the system reacted more intensively to point source concentration changes than to water drain. The use of regional parameters to assess DIN and OP loadings from earthen ponds to salt marshes, based on land use and topography, may be useful when working on a regional scale. Modeling nonpoint sources of DIN and OP from aquacultural land to surface water can be both complex and data intensive. Ourgoal was to develop a simple model that would account for spatial pattern in topography and land use using Geographic Information System (GIS) databases.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 18:32:58