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Plane source injector design for river dispersion studies
A device that injects a planar, spike input of tracer and accommodates irregular stream cross-sections was designed and field tested. The injector is...
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Bacterial Biomass
Among soil microorganisms, bacteria are particularly suitable for quantification by counting. It should be considered, however, that bacteria are...
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Measurements and modeling of tracer transport in a sandy soil
A physically-based dual-porosity model of water and solute transport under transient field conditions was used to simulate 3 H transport in seven...
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A Fiber Optic LIF-Sensor for Measuring Temporal and Spatial Distribution of Tracers in the Ground
In soil physics there is a great interest in the exact investigation of the flow path of different solutions in the ground. Both, the spatial and the...
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Release Assessment
Release assessment involves quantifying the extent to which a risk source releases or otherwise introduces risk agents into the human environment....
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External nutrient sources, internal nutrient pools, and phytoplankton production in Chesapeake Bay
External nutrient loadings, internal nutrient pools, and phytoplankton production were examined for three major subsystems of the Chesapeake Bay...
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Factors that influence water exchange in spring-fed tidal canals
Environmental factors that influenced the rates of water exchange in a series of tidal, dead-end canals in Crystal River, Florida, were investigated...
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A Novel Fluorometric Method for Monitoring Virus Replication In Response to Heavy Metals
Earlier, we found with Epstein Barr virus and Type 2 Herpes simplex that copper acetate added after virus attachmment reduced significantly virion...
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Pollutant Transport Studies in the Paraíba Do Sul River, Brazil
This paper describes the development of a computer system for water quality modelling with particular reference to the Paraiba do Sul river in...
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Use of Snow and Firn Analysis to Reconstruct Past Atmospheric Composition
There is no doubt that the knowledge about temporal and spatial variability of trace constituents is crucial for understanding the interaction...
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Chlorinated pesticides in foodstuffs in Hong Kong
The movement of pesticides into and out of Hong Kong shows a high net gain of DDT and benzene hexachloride (BHC). 310 food samples were analyzed for...
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Measuring Longshore Transport with Tracers
This chapter describes the results of experiments using sand tracers to measure the bedload response to forcing by waves and currents. Previous field...
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Time Scale Variations of Estuarine Stratification Parameters and Impact on the Food Chains of the Chesapeake Bay
There are three basic premises in this paper. One is that many species which utilize estuarine waters during part or all of their life cycle stages...
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Application of Tracer Theory to NSTS Experiments
The successful use of tracer sand to determine sediment transport rates relies on the two basic premises that the tracer behaves exactly in the same...
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Tracer Theory
An important aspect of environmental engineering is the prediction of the behavior of a foreign substance introduced into the environment. In...
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Discrete Sampling of Bedload and Suspended Load
This aspect of the program included the development of fluorescent sand tracer and suspended sediment sampling devices and procedures for their use...
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An evaluation of two bacteriophages as sewage tracers
Two bacteriophages — phage 80 of Staphylococcus aureus and a P2-like phage (ϕMWD 1) of Escherichia coli (H 2 S + ) — were evaluated as sewage tracers....
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Microbial contamination of alluvial gravel aquifers by septic tank effluent
The effects of two methods of septic tank effluent disposal on the microbial quality of alluvial gravel aquifers were investigated at an experimental...
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Early Soil Physics into the Mid-20th Century
The history of soil physics in its earliest manifestations is the history of soil science inasmuch as the earliest scientific observations and...
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Probable Impact of Proposed Izmir Wastewater Treatment Plant Effluents on Izmir Bay Water Quality
According to the tzmit Sewerage project which will soon be under way, the collection of municipal and industrial wastewaters will be possible with...