Effects of urban sprawl on sediment, surface water, and biota in the little Blackwater River, Blackwater National Wildlife Refuge, Dorchester County, Maryland
Notice bibliographique
Résumé
the little blackwater river drains a catchment area of approximately 11 229 hectares 27 748 acres about 516 hectares 1 276 acres in this watershed are currently developed for residential commercial and light industrial land use while the remaining 10 713 hectares 26 472 acres comprise a rural agricultural landscape consisting of cropland woodland forested and marshy riparian areas and tidal wetlands the land surface is level with frequent flooding due to poor drainage low flow gradients high water tables and hydric soils in recent years there has been extreme pressure to develop the little blackwater watershed the city of cambridge and dorchester county are considering zoning and permitting of nearly 3 238 hectares 8 000 acres for development in the next few years the little blackwater river drains directly into the blackwater national wildlife refuge the blackwater national wildlife refuge was established in 1933 as a refuge for migratory waterfowl the refuge includes more than 11 331 hectares 28 000 acres composed mainly of rich tidal marsh characterized by fluctuating water levels and variable salinity blackwater national wildlife refuge is one of the chief wintering areas for canada geese using the atlantic flyway geese number approximately 35 000 and ducks exceed 15 000 at the peak of fall migration usually in november urbanization of the little blackwater river could have an effect on water and sediment quality and may adversely affect fish and wildlife resources on blackwater national wildlife refuge we used the sediment quality triad approach to evaluate the potential impacts of the proposed development the sediment quality triad is a weight of evidence approach consisting of synoptically collected measures of sediment chemistry benthic fish community structure and sediment toxicity the study area included three sites upstream of the blackwater wildlife refuge on the little blackwater river three samples downstream on the refuge and a reference site on buttons creek an adjacent watershed that is comprised almost entirely of undeveloped forest and marsh in general the little blackwater river watershed has had little impact from the contaminants evaluated in this study although the benthic community in this watershed is depressed it is more likely a function of the physical characteristics of the shallow water system rather than an effect of contaminants in 2004 proposals were made to dorchester county for the development of two separate parcels of approximately 1 000 acres each within the little blackwater watershed nearly 4 500 homes and a golf course were planned for a 1 100 acre site along the north tributary and a mixed use industrial park was proposed near the east tributary southeast of cambridge by 2007 most of the plans were either scaled back or abandoned because developmental pressures on this watershed were greatly diminished in 2006 the second year data was similar to the first making this report a baseline study rather than a comparison of pre and post construction effects
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,002 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,001 |
| Études des sciences et des technologies | 0,001 | 0,001 |
| Communication savante | 0,001 | 0,000 |
| Science ouverte | 0,000 | 0,001 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».