scholarly journals Hydrogeologic setting and preliminary estimates of hydrologic components for Bull Run Lake and the Bull Run Lake drainage basin, Multnomah and Clackamas counties, Oregon

1996 ◽  
Keyword(s):  
Drainage Basin ◽  
Hydrogeologic Setting ◽  
Lake Drainage

Sediment Records of Man’s Activities in the Kootenay Lake Drainage Basin

1994 ◽  
Vol 29 (1) ◽  
pp. 103-116
Author(s):  
R.W. Macdonald ◽  
E.C. Carmack ◽  
C.H. Pharo
Keyword(s):  
Sedimentation Rate ◽  
Drainage Basin ◽  
Road Construction ◽  
The North ◽  
Mining History ◽  
Boom And Bust ◽  
History Of ◽  
Lead Zinc ◽  
Lake Drainage ◽  
Kootenay Lake

Abstract Four cores from Kootenay Lake have been dated using 2l0Pb. These cores have also been analyzed for total Pb concentration specifically to compare the sediment record with the known history of lead-zinc mining around the lake. Two sorts of impact on the lake are recorded in the sediments. First, there is obvious contamination by Pb in which concentrations within cores parallel the regional “boom-and-bust” mining history. Second, the sedimentation rate appears to have been affected by damming of the inflowing rivers and probably also by logging and the associated road construction in the watersheds. Spatial variability within the lake sediments is evident: sedimentation rate is highest towards the north and south ends of the lake where river inflow is greatest; contamination by Pb is highest in the middle of the lake close to the major mining activities.

Land Utilization of the University Lake Drainage Basin

1939 ◽  
Vol 15 (3) ◽  
pp. 293
Author(s):  
F. C. Erickson ◽  
W. H. Levitt
Keyword(s):  
Drainage Basin ◽  
Land Utilization ◽  
Lake Drainage ◽  
The University

scholarly journals Fire Effects on the Biological and Geological Characteristics of Sediments in Yellowstone Lake: A Basis for Improved Fire Management Policy

1990 ◽  
Vol 14 ◽  
pp. 173-175
Author(s):  
Brian Shero ◽  
Jill Singer
Keyword(s):  
Forest Fires ◽  
Nutrient Loading ◽  
Fire Management ◽  
Drainage Basin ◽  
Fire Effects ◽  
Consistent Pattern ◽  
Management Policy ◽  
Yellowstone Lake ◽  
Geological Characteristics ◽  
Lake Drainage

A number of studies have examined the effect of forest fires on the nutrient and productivity levels of lakes and streams, but no consistent pattern has been identified. In the specific case of Yellowstone Lake, Romme and Knight (1982) and Albin (1979) suggested that cyclic fires in the Yellowstone Lake drainage basin could potentially increase nutrient loading of the lake and thereby increase its productivity.

Influenza di esposizione ed altitudine sulla distribuzione della vegetazione seriale nelle Alpi Orobie (Lombardia, Italia). Elevation and exposition influence on vegetation serial distribution in Orobie Alps (Lombardia, Italy)

2010 ◽  
Vol 35 ◽  
pp. 77-95 ◽  
Author(s):  
Elena Castoldi ◽  
José A. Molina
Keyword(s):  
Cluster Analysis ◽  
Drainage Basin ◽  
Vegetation Types ◽  
West Side ◽  
Eastern Side ◽  
Sono Stati ◽  
Spatially Distributed ◽  
Altitudinal Belts ◽  
Lake Drainage ◽  
Steep Slopes

Italiano.  Il presente lavoro si occupa di indagare gli effetti che l’esposizione e l’altitudine esercitano sulle formazioni erbacee ed arbustive della Val Varrone, valle prealpina orientale del bacino imbrifero del lago di Como. Tramite cluster analysis sono stati caratterizzati 6 aggruppamenti vegetali attribuibili a 6 associazioni fitosociologiche. Gli aggruppamenti sono stati poi caratterizzati dal punto di vista ecologico, d’accordo con i parametri di Landolt. Dall’analisi dell’assolazione, tramite la formula di Bartorelli, le comunità vegetali vengono distribuite spazialmente nel territorio. L’associazione Centaureo –Arrhenatheretum è diffusa a basse quote principalmente su versanti con esposizione meridionale. L’associazione Festucetum variae, invece, è stata rilevata ad altitudini piú elevate, sempre con esposizione sud. In corrispondenza della fascia intermedia, l’associazione Homogyno alpinae-Nardetum presenta la maggior ampiezza altitudinale, le associazioni Rumicetum alpinii e Alnetum viridis prediligono fasce altitudinali meno ampie, mentre l’associazione Vaccinio-Rhododendretum ferrugineum cresce su pendii ripidi. La vegetazione seriale delle Alpi Orobie (lato orientale del lago di Como) risulta essere simile a quella dell’Alto Lario Occidentale (lato occidentale).English. The aim of this work is to seek the influence of certain geographical factors such as elevation and exposition on herbaceous and shrub vegetation in Val Varrone, a pre-alpine eastern valley of Como Lake drainage basin. Through cluster analysis were identified 6 vegetation groups, referable to 6 phytosociological associations. They were ecologically characterized according to Landolt parameters. Insolation analysis based on Bartorelli formulae revealed that vegetation types are spatially distributed in the area. The CentaureoArrhenatheretum association occurs at the lower altitudes, mainly on slopes with southern exposure. The Festucetum variae association, however, was found at higher altitudes, always facing south. At the mid-range, the Homogyno alpinae-Nardetum association presents the widest altitude, both the Rumicetum alpinii and Alnetum viridis associations prefer altitudinal belts less extensive, and finally the Vaccinio-Rhododendretum ferrugineum association grows on steep slopes. The vegetation of serial Orobie Alps (the eastern side of Como Lake) appears to be similar to the Alto Lario (west side).

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