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2,706 full-text articles. Page 57 of 58.

Modelling The Impacts Of A Mixed Forestry Plantation On Groundwater Resources In The Beaufort River Area, Western Australia, Paul Raper, Richard J. George Dr 2010 Department of Agriculture and Food, Western Australia

Modelling The Impacts Of A Mixed Forestry Plantation On Groundwater Resources In The Beaufort River Area, Western Australia, Paul Raper, Richard J. George Dr

Resource management technical reports

No abstract provided.


Mixing By Shear Instability At High Reynolds Number, W. R. Geyer, A. C. Lavery, M. E. Scully, J. H. Trowbridge 2010 Old Dominion University

Mixing By Shear Instability At High Reynolds Number, W. R. Geyer, A. C. Lavery, M. E. Scully, J. H. Trowbridge

CCPO Publications

Shear instability is the dominant mechanism for converting fluid motion to mixing in the stratified ocean and atmosphere. The transition to turbulence has been well characterized in laboratory settings and numerical simulations at moderate Reynolds number-it involves "rolling up", i.e., overturning of the density structure within the cores of the instabilities. In contrast, measurements in an energetic estuarine shear zone reveal that the mixing induced by shear instability at high Reynolds number does not primarily occur by overturning in the cores; rather it results from secondary shear instabilities within the zones of intensified shear separating the cores. This regime ...


Multimedia And Ultrafiltration For Reverse Osmosis Pretreatment Aboard Naval Vessels, Angela C. Mehner 2010 University of Arkansas, Fayetteville

Multimedia And Ultrafiltration For Reverse Osmosis Pretreatment Aboard Naval Vessels, Angela C. Mehner

Inquiry: The University of Arkansas Undergraduate Research Journal

The US Navy is interested in improving the pretreatment for shipboard Reverse Osmosis potable water systems. To investigate this problem, the Navy prepared a Task for the 2010 WERC (http://www.werc.net) competition. The research described in this paper was performed to compete in this WERC Task and ultimately received a 1st place award. Several technologies were considered as options for improving the current pretreatment process. Multi-media filtration followed by ultrafiltration was chosen as the most economical solution. This paper presents the final design for a full-scale shipboard system that incorporates multimedia filtration and ultrafiltration yet requires minimal space ...


Droughtscape- Winter 2010, Kelly Smith 2010 University of Nebraska-Lincoln

Droughtscape- Winter 2010, Kelly Smith

Droughtscape, Quarterly Newsletter of NDMC, 2007-

USDM Forum Highlights

Drought Likely to Ease

Research Shows Birds Vulnerable to Drought

Drought Recedes in 2009

CA, TX Suffer Impacts from Ongoing Drought

NDMC Wishes Ryu Well

Conferees Pick SPI for Global Drought Index


Managing Drought Risk On The Ranch: A Planning Guide For Great Plains Ranchers, University of Nebraska - Lincoln National Drought Mitigation Center 2010 University of Nebraska - Lincoln

Managing Drought Risk On The Ranch: A Planning Guide For Great Plains Ranchers, University Of Nebraska - Lincoln National Drought Mitigation Center

Publications of the National Drought Mitigation Center

TABLE OF CONTENTS

WHY PLAN FOR DROUGHT?......... 3

UNDERSTANDING DROUGHT........... 6

THE RANCH DROUGHT PLAN........... 9

COMMUNICATION AND PLANNING PARTNERS............ 10

RANCH VISION AND OBJECTIVES............. 11

SWOT ANALYSIS............... 12

INVENTORY OF RANCH RESOURCES................ 13

CRITICAL DATES AND TARGET POINTS................. 15

MONITORING PLAN AND SCHEDULE.................... 19

EVALUATE DROUGHT MANAGEMENT STRATEGIES............ 20

IMPLEMENT AND MONITOR THE DROUGHT PLAN............ 29

WORKSHEETS........... 30


Absence Of Predation Eliminates Coexistence: Experience From The Fish-Zooplankton Interface, Z. M. Gilwicz, Wayne A. Wurtsbaugh, E. Szymansk 2010 Utah State University

Absence Of Predation Eliminates Coexistence: Experience From The Fish-Zooplankton Interface, Z. M. Gilwicz, Wayne A. Wurtsbaugh, E. Szymansk

Watershed Sciences Faculty Publications

Examples from fishless aquatic habitats show that competition among zooplankton for resources instigates rapid exclusion of competitively inferior species in the absence of fish predation, and leads to resource monopolization by the superior competitor. This may be a single species or a few clones with large body size: a cladoceran such as Daphnia pulicaria, or a branchiopod such as Artemia franciscana, each building its population to a density far higher than those found in habitats with fish. The example of zooplankton from two different fish-free habitats demonstrates the overpowering force of fish predation by highlighting the consequences of its absence ...


Sediment Phosphorus Flux In Beaver Lake In Northwest Arkansas, Taraf Abu Hamdan, Thad Scott, Duane Wolf, Brian E. Haggard 2010 University of Arkansas, Fayetteville

Sediment Phosphorus Flux In Beaver Lake In Northwest Arkansas, Taraf Abu Hamdan, Thad Scott, Duane Wolf, Brian E. Haggard

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

Internal phosphorus (P) loading may influence primary production in lakes, but the influence of sediment-derived P has not been well studied in Beaver Lake of Northwest Arkansas. Soluble reactive phosphorus (SRP), dissolved organic P (DOP), and total dissolved P (TDP) sediment-water fluxes were determined using intact sediment cores collected from deepwater environments in the riverine, transition zone, and lacustrine zones of Beaver Lake. The SRP, DOP, and TDP fluxes were also estimated from cores collected from shallow locations in the transition zone. There was a net positive SRP (0.001 – 0.005 µg P cm-2 h-1), DOP (0.005 – 0 ...


Assessment Of Total Organic Carbon Concentrations In Two Streams Of Northwest Arkansas: Town Branch And Brush Creek, Abigail N. Washispack, Jason A. McGinnis, Brian E. Haggard 2010 University of Arkansas, Fayetteville

Assessment Of Total Organic Carbon Concentrations In Two Streams Of Northwest Arkansas: Town Branch And Brush Creek, Abigail N. Washispack, Jason A. Mcginnis, Brian E. Haggard

Discovery, The Student Journal of Dale Bumpers College of Agricultural, Food and Life Sciences

Within a stream, changes in flow rate and local environment can affect the total organic content (TOC) concentrations in the stream water and TOC delivery downstream to water supply reservoirs. Disinfection by-products (DBPs) result from various chemical reactions between chlorine, bromine, and organic carbon in raw water during the drinking water treatment process; DBPs are potential carcinogens and are regulated by the U.S. Environmental Protection Agency. In this project, we measured the TOC concentrations in two streams in the Beaver Lake Watershed: Town Branch and Brush Creek. We then compared TOC concentrations between the two streams and to that ...


Determining Rates Of Virus Production In Aquatic Systems By The Virus Reduction Approach,, M.G. Weinbauer, J.M. Rowe, Steven Wilhelm 2010 University of Tennessee, Knoxville

Determining Rates Of Virus Production In Aquatic Systems By The Virus Reduction Approach,, M.G. Weinbauer, J.M. Rowe, Steven Wilhelm

Microbiology Publications and Other Works

The reduction approach to assess virus production and the prokaryotic mortality by viral lysis stops new infection by reducing total virus abundance (and thus virus–host contacts). This allows for easy enumeration of viruses that originate from lysis of already infected cells due to the decreased abundance of free virus particles. This reoccurrence can be quantified and used to assess production and cell lysis rates. Several modifications of the method are presented and compared. The approaches have great potential for elucidating trends in virus production rates as well as for making generalized estimates of the quantitative effects of viruses on ...


The Construction And Analysis Of Marker Gene Libraries, S.M. Short, F. Chen, Steven Wilhelm 2010 University of Tennessee, Knoxville

The Construction And Analysis Of Marker Gene Libraries, S.M. Short, F. Chen, Steven Wilhelm

Microbiology Publications and Other Works

Marker genes for viruses are typically amplified from aquatic samples to determine whether specific viruses are present in the sample, or to examine the diversity of a group of related viruses. In this chapter, we will provide an overview of common methods used to amplify, clone, sequence, and analyze virus marker genes, and will focus our discussion on viruses infecting algae, bacteria, and heterotrophic flagellates. Within this chapter, we endeavor to highlight critical aspects and components of these methods. To this end, instead of providing a detailed experimental protocol for each of the steps involved in examining virus marker gene ...


Climate Change And Freshwater Resources In Oregon, Heejun Chang, Julie Jones 2010 Portland State University

Climate Change And Freshwater Resources In Oregon, Heejun Chang, Julie Jones

Institute for Sustainable Solutions Publications and Presentations

Climate change will affect various sectors of water resources in Oregon in the 21st century. The observed trends in streamflow show significant declines in September flow and, although not significant, increases in March flow in many transient rain-snow basins. These streamflow trends are associated with rising temperature and coincident declines in snowpack in spring in the latter half of the 20th century. While there are no distinct trends in high precipitation events, such events are associated with climate variability such as ENSO and PDO. Effects of ENSO and PDO are more pronounced at the beginning and end of the wet ...


Tributary Contribution To The Spring River, Ar As Determined By Water Quality Analyses, T. R. Brueggen, C. B. Dowling, Jennifer L. Bouldin 2010 Arkansas State University

Tributary Contribution To The Spring River, Ar As Determined By Water Quality Analyses, T. R. Brueggen, C. B. Dowling, Jennifer L. Bouldin

Journal of the Arkansas Academy of Science

Tributaries often play an important role in the chemical properties, productivity and species diversity in a river channel. The objective of this study was to analyze the effect of tributaries on the water quality of the Spring River, AR. The Spring River has an approximate length of 92 km and has been divided into four zones according to the water source(s) that feed that segment of river. In this study approximately 30 km of the upstream river segment were sampled, which included nine tributaries contributing to the main river channel and incorporated the upper three previously defined zones. Samples ...


Implementing Deep Drainage To Reduce Salinity In The Date Creek Catchment, South West Western Australia, Derk Bakker, John P. Collins, Justin Hardy 2010 Department of Agriculture and Food, Western Australia

Implementing Deep Drainage To Reduce Salinity In The Date Creek Catchment, South West Western Australia, Derk Bakker, John P. Collins, Justin Hardy

Resource management technical reports

No abstract provided.


The Distribution And Origins Of Acid Groundwaters In The South West Agricultural Area, Adam Lillicrap, Richard J. George Dr 2010 Department of Agriculture and Food, Western Australia

The Distribution And Origins Of Acid Groundwaters In The South West Agricultural Area, Adam Lillicrap, Richard J. George Dr

Resource management technical reports

No abstract provided.


Estimating Detection Probabilities In Beach Seine Surveys For Estuarine Fishes, Branson D. Williams 2010 College of William and Mary - Virginia Institute of Marine Science

Estimating Detection Probabilities In Beach Seine Surveys For Estuarine Fishes, Branson D. Williams

Dissertations, Theses, and Masters Projects

Detectability, the probability that a species is encountered if it inhabits a site, is often overlooked in fisheries research despite its potential to obscure habitat use inferences. Detectability can be estimated using models that also provide an estimate of occupancy (Ψ), the probability that a species inhabits a site. I used these models to estimate both probabilities, and to examine factors affecting detectability and occupancy for three fishes in Chesapeake Bay tributaries: young-of-the-year striped bass (Morone saxatilis), yearling Atlantic croaker (Micropogonias undulatus), and spottail shiner (Notropis hudsonius). Occupancy models were fitted to data from a seine survey conducted during summer ...


The Effect Of Salinity On Experimental Hematodinium Sp Infections In The Blue Crab, Callinectes Sapidus, Anna Huntley Coffey 2010 College of William and Mary - Virginia Institute of Marine Science

The Effect Of Salinity On Experimental Hematodinium Sp Infections In The Blue Crab, Callinectes Sapidus, Anna Huntley Coffey

Dissertations, Theses, and Masters Projects

No abstract provided.


Exploring The Potential For Bay Scallop Restoration In The Lynnhaven River Sub-Estuary Of Chesapeake Bay, Ana Liza Hernandez Cordero 2010 College of William and Mary - Virginia Institute of Marine Science

Exploring The Potential For Bay Scallop Restoration In The Lynnhaven River Sub-Estuary Of Chesapeake Bay, Ana Liza Hernandez Cordero

Dissertations, Theses, and Masters Projects

No abstract provided.


Habitat Complexity And Habitat Function Of Native (Crassostrea Virginica) And Non-Native (C. Ariakensis) Oysters In The Chesapeake Bay Region, Heather D. Harwell 2010 College of William and Mary - Virginia Institute of Marine Science

Habitat Complexity And Habitat Function Of Native (Crassostrea Virginica) And Non-Native (C. Ariakensis) Oysters In The Chesapeake Bay Region, Heather D. Harwell

Dissertations, Theses, and Masters Projects

Complex oyster reefs created by the Eastern oyster, Crassostrea virginica, though once prominent features of the Chesapeake Bay region, have become relatively scarce in comparison to historic descriptions. This decline, caused by a combination of overfishing, disease, habitat destruction and pollution, this decline continues despite substantial restoration efforts that have spanned decades. In response to this decline, the states of Virginia and Maryland considered the intentional introduction of the non-native Suminoe oyster, C. ariakensis. Previous studies questioned the reef-building capability of this Crassostrea species, which may affect its habitat function. Through a combination of field and mesocosm studies, I examined ...


"You Have No Boss Here To Work For": Women And Labor In Chesapeake Bay Fishing Communities, Elizabeth Marie O'Grady 2010 College of William & Mary - Arts & Sciences

"You Have No Boss Here To Work For": Women And Labor In Chesapeake Bay Fishing Communities, Elizabeth Marie O'Grady

Dissertations, Theses, and Masters Projects

No abstract provided.


Partial Year Tagging Models: Accounting For Changing Tag Visibility And Delayed Mixing, Lynn Waterhouse 2010 College of William and Mary - Virginia Institute of Marine Science

Partial Year Tagging Models: Accounting For Changing Tag Visibility And Delayed Mixing, Lynn Waterhouse

Dissertations, Theses, and Masters Projects

No abstract provided.


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