Spelling suggestions: "subject:"divers"" "subject:"fivers""
121 |
Estimating Phosphorus in rivers of Central Sweden using Landsat TM dataAndersson, Marcus January 2012 (has links)
Phosphorus flowing via rivers into the Baltic Sea is a major source of nutrients, and in some cases the limiting factor for the growth of algae which causes the phenomenon known as eutrophication. Remote sensing of phosphorus, here using Landsat TM-data, can help to give a better understanding of the process of eutrophication. Since Landsat TM-data is used, this could form a basis for further spatio-temporal analysis in the Baltic Sea region. A method originally described and previously applied for a Chinese river is here transferred and applied to three different rivers flowing into the Baltic Sea. The results show that by measuring the proxy variables of Secchi Depth and Chloryphyll-a the remote sensing model is able to explain 41% of the variance in total- phosphorus for the rivers Dalälven, Norrström and Gavleån without any consideration taken to CDOM, turbidity or other local features.
|
122 |
Dissolved organic matter discharge in the six largest arctic rivers-chemical composition and seasonal variabilityRinehart, Amanda J. 15 May 2009 (has links)
The vulnerability of the Arctic to climate change has been realized due to
disproportionately large increases in surface air temperatures which are not uniformly
distributed over the seasonal cycle. Effects of this temperature shift are widespread in
the Arctic but likely include changes to the hydrological cycle and permafrost thaw,
which have implications for the mobilization of organic carbon into rivers. The focus of
this research was to describe the seasonal variability of the chemical composition of
dissolved organic matter (DOM) in the six largest Arctic rivers (Yukon, Mackenzie, Ob,
Yenisei, Lena and Kolyma) using optical properties (UV-Vis Absorbance and
Fluorescence) and lignin phenol analysis. We also investigated differences between
rivers and how watershed characteristics influence DOM composition.
Dissolved organic carbon (DOC) concentrations followed the hydrograph with
highest concentrations measured during peak river flow. The chemical composition of
peak-flow DOM indicates a dominance of freshly leached material with elevated
aromaticity, larger molecular weight, and elevated lignin yields relative to base-flow
DOM. During peak flow, soils in the watershed are still frozen and snowmelt water
follows a lateral flow path to the river channels. As the soils thaw, surface water
penetrates deeper into the soil horizons leading to lower DOC concentrations and likely
altered composition of DOM due to sorption and microbial degradation processes. The
six rivers studied here shared a similar seasonal pattern and chemical composition.
There were, however, large differences between rivers in terms of total carbon discharge
reflecting the differences in watershed characteristics such as climate, catchment size, river discharge, soil types, and permafrost distribution. The large rivers (Lena, Yenisei),
with a greater proportion of permafrost, exported the greatest amount of carbon. The
Kolyma and Mackenzie exported the smallest amount of carbon annually, however, the
discharge weighted mean DOC concentration was almost 2-fold higher in the Kolyma,
again, indicating the importance of continuous permafrost. The quality and quantity of
DOM mobilized into Arctic rivers appears to depend on the relative importance of
surface run-off and extent of soil percolation. The relative importance of these is
ultimately determined by watershed characteristics.
|
123 |
Das Strommotiv und die deutsche KlassikMüller, Richard Matthias, January 1957 (has links)
Thesis--Bonn. / Vita. Includes bibliographical references (p. 273-282).
|
124 |
Die Eisverhältnisse im Kaiser Wilhelm-Kanal ...Eichstädt, Franz, January 1919 (has links)
Inaug.-Diss.--Kiel. / Lebenslauf. "Verzeichnis der benutzten Literatur": p. [4].
|
125 |
Monitoring dioxin levels in Maine rivers with semipermeable membrane devices /Shoven, Heather A., January 2001 (has links)
Thesis (M.S.) in Ecology and Environmental Sciences--University of Maine, 2001. / Includes vita. Includes bibliographical references (leaves 153-157).
|
126 |
Damage and recovery of zooplankton communities in acidified lakes of south-central OntarioHolt, Catherine A. January 2001 (has links)
Thesis (M. Sc.)--York University, 2001. Graduate Programme in Biology. / Typescript. Includes bibliographical references (leaves 60-75, 135-143, 161-163). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://wwwlib.umi.com/cr/yorku/fullcit?pMQ66384.
|
127 |
The influence of coarse woody debris, disturbance, and restortion on biological communities in sandy coastal plain streamsMitchell, Richard Morgan. Feminella, Jack W. January 2009 (has links)
Dissertation (Ph.D.)--Auburn University, / Abstract. Includes bibliographic references.
|
128 |
The River-Irrigating Waters of Arizona - Their Character and EffectsForbes, R. H. 30 September 1902 (has links)
This item was digitized as part of the Million Books Project led by Carnegie Mellon University and supported by grants from the National Science Foundation (NSF). Cornell University coordinated the participation of land-grant and agricultural libraries in providing historical agricultural information for the digitization project; the University of Arizona Libraries, the College of Agriculture and Life Sciences, and the Office of Arid Lands Studies collaborated in the selection and provision of material for the digitization project.
|
129 |
Activated carbon adsorption of an anionic surfactantLiebendorfer, Paul John, 1946- January 1973 (has links)
No description available.
|
130 |
The winter energy requirement of an open water channel in the Gulf of St. Lawrence : a study of the possibility of keeping an open lead in the Gulf ice, and the consequences for the energy balanceRenaud, Fabiola. January 1976 (has links)
No description available.
|
Page generated in 0.043 seconds