Flow variability in dryland rivers: boom, bust and the bits in between

2006 ◽  
Vol 22 (2) ◽  
pp. 179-186 ◽  
Author(s):  
Stuart E. Bunn ◽  
Martin C. Thoms ◽  
Stephen K. Hamilton ◽  
Samantha J. Capon
Keyword(s):  
Flow Variability ◽  
Dryland Rivers

scholarly journals What evidence exists on the impacts of flow variability on fish and macroinvertebrates of temperate floodplain rivers in Central and Western Europe? A systematic map protocol

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Agata Keller ◽  
Somsubhra Chattopadhyay ◽  
Mikołaj Piniewski
Keyword(s):  
Climate Change ◽  
Western Europe ◽  
Climatic Variability ◽  
Grey Literature ◽  
Habitat Type ◽  
Water Diversion ◽  
Systematic Map ◽  
Eligibility Criteria ◽  
Flow Variability ◽  
Floodplain Rivers

Abstract Background Flow variability is considered a fundamental factor affecting riverine biota. Any alterations to flow regime can influence freshwater organisms, and this process is expected to change with the projected climate change. This systematic map, therefore, aims at investigating the impacts of natural (resulting from climatic variability), anthropogenic (resulting from direct human pressure), and climate change-induced flow variability on fish and macroinvertebrates of temperate floodplain rivers in Central and Western Europe. Particular focus will be placed on the effects of extreme low and high discharges. These rare events are known to regulate population size and taxonomic diversity. Methods All studies investigating the effects of flow variability on metrics concerning freshwater fish and macroinvertebrates will be considered in the map, particularly metrics such as: abundance, density, diversity, growth, migration, recruitment, reproduction, survival, or their substitutes, such as biomonitoring indices. Relevant flow variability will reflect (1) anthropogenic causes: dams, reservoirs, hydroelectric facilities, locks, levees, water abstraction, water diversion, land-use changes, road culverts; (2) natural causes: floods, droughts, seasonal changes; or (3) climate change. Geographically, the map will cover the ecoregion of Central and Western Europe, focusing on its major habitat type, namely “temperate floodplain rivers and wetlands”. The review will employ search engines and specialist websites, and cover primary and grey literature. No date, language, or document type restrictions will be applied in the search strategy. We expect the results to be primarily in English, although evidence (meeting all eligibility criteria) from other languages within the study area will also be included. We will also contact relevant stakeholders and announce an open call for additional information. Eligibility screening will be conducted at two levels: title and abstract, and full text. From eligible studies the following information will be extracted: the cause of flow variability, location, type of study, outcomes, etc. A searchable database containing extracted data will be developed and provided as supplementary material to the map report. The final narrative will describe the quantity and key characteristics of the available evidence, and identify knowledge gaps and knowledge clusters, i.e. subtopics sufficiently covered by existing studies allowing full systematic review and meta-analysis.

Observation of the Argentière Glacier Flow Variability from 2009 to 2011 by TerraSAR-X and GPS Displacement Measurements

2014 ◽  
Vol 7 (8) ◽  
pp. 3274-3284 ◽  
Author(s):  
Fanny Ponton ◽  
Emmanuel Trouve ◽  
Michel Gay ◽  
Andrea Walpersdorf ◽  
Renaud Fallourd ◽  
...  
Keyword(s):  
Flow Variability ◽  
Glacier Flow ◽  
Displacement Measurements

Flow variability and its physical causes in infusion technology: a systematic review of in vitro measurement and modeling studies

2015 ◽  
Vol 60 (4) ◽  
Author(s):  
Roland A. Snijder ◽  
Maurits K. Konings ◽  
Peter Lucas ◽  
Toine C. Egberts ◽  
Annemoon D. Timmerman
Keyword(s):  
Systematic Review ◽  
Adverse Effects ◽  
Flow Rate ◽  
Medical Errors ◽  
Biomedical Literature ◽  
Infusion Therapy ◽  
Flow Variability ◽  
Modeling Studies

AbstractInfusion therapy is medically and technically challenging and frequently associated with medical errors. When administering pharmaceuticals by means of infusion, dosing errors can occur due to flow rate variability. These dosing errors may lead to adverse effects. We aimed to systematically review the available biomedical literature for

Innovative Variable Turbine Concept for Turbochargers

2011 ◽  
Author(s):  
Elias Chebli ◽  
Michael Casey ◽  
Markus Mu¨ller ◽  
Siegfried Sumser ◽  
Gernot Hertweck ◽  
...  
Keyword(s):  
Aerodynamic Performance ◽  
Cfd Simulations ◽  
Flow Variability ◽  
Variable Turbine Geometry ◽  
Turbine Efficiency ◽  
New Concepts ◽  
Specific Speed ◽  
Turbine Impeller ◽  
Flow Cross ◽  
Wide Operating

New concepts for the optimisation of supercharging systems have been analysed to improve fuel consumption, emissions and transient diesel engine response. In addition to the conventional VTG (Variable Turbine Geometry) where the variability takes place upstream of the turbine impeller, a new innovative variable turbine geometry called VOT (Variable Outlet Turbine) is investigated in this paper where the variability takes place at impeller exit. The flow variability is achieved by variation of the flow cross-section at the turbine outlet using an axial displacement of a sliding sleeve over the exducer and provides a simple solution for flow variability. The flow field of the VOT is calculated by means of steady state 3D-CFD simulations to predict the aerodynamic performance as well as to analyse the loss mechanisms. The VOT design is optimised by finding a good balance between clearance and outlet losses to improve the turbine efficiency. Furthermore, experimental results of the VOT are presented and compared to a turbine equipped with a waste gate (WG) that verify the efficiency advantage of the VOT. In general, it is found that the use of the VOT at high specific speed is important to reduce the outlet losses and to improve the turbine efficiency over a wide operating range.

The Sensitivity of Persistent Geopotential Anomalies to the Climate of a Moist Channel Model

2021 ◽  
pp. 1-52
Author(s):  
Gregory Tierney ◽  
Walter A. Robinson ◽  
Gary Lackmann ◽  
Rebecca Miller
Keyword(s):  
Climate Change ◽  
Heat Release ◽  
Latent Heat ◽  
Channel Model ◽  
Heat Waves ◽  
Latent Heat Release ◽  
Mean Flow ◽  
Flow Variability ◽  
Virtual Temperature ◽  
Channel Configuration

AbstractHigh-impact events such as heat waves and droughts are often associated with persistent positive geopotential height anomalies (PAs). Understanding how PA activity will change in a future warmer climate is therefore fundamental to projecting associated changes in weather and climate extremes. This is a complex problem because the dynamics of PAs and their associated blocking activity are still poorly understood. Furthermore, climate-change influences on PA activity may be geographically dependent and encompass competing influences. To expose the salient impacts of climate change, we use an oceanic channel configuration of the Weather Research and Forecasting model (WRF) in a bivariate experiment focused on changes in environmental temperature, moisture, and baroclinicity. The 500-hPa wind speed and flow variability are found to increase with increasing temperature and baroclinicity, driven by increases in latent heat release and a stronger virtual temperature gradient. Changes to 500-hPa sinuosity are negligible. PAs are objectively identified at the 500-hPa level using an anomaly threshold method. When using a fixed threshold, PA trends indicate increased activity and strength with warming, but decreased activity and strength with Arctic amplification. Use of a climate-relative threshold hides these trends and highlights the importance of accurate characterization of the mean flow. Changes in PA activity mirror corresponding changes in 500-hPa flow variability and are found to be attributable to changes in three distinct dynamical mechanisms: baroclinic wave activity, virtual temperature effects, and latent heat release.

scholarly journals A new approach for assessing natural patterns of flow variability and hydrological alterations: The case of the Spanish rivers

2019 ◽  
Vol 233 ◽  
pp. 200-210 ◽  
Author(s):  
Silvestre García de Jalón ◽  
Marta González del Tánago ◽  
Diego García de Jalón
Keyword(s):  
New Approach ◽  
Flow Variability
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