Environmental control of emergence patterns: Case study of changes in hourly and daily emergence of aquatic insects at constant and variable water temperatures

The Town of Bluffton, South Carolina was a one square mile coastal village until it experienced exponential growth in the early 2000s, and today is approximately 54 square miles. Until this recent growth, few sources of possible impairments to water quality were recognized within the watershed, and even fewer within close proximity to the river itself. In 2007, the Town was told by the S.C. Department of Health and Environmental Control (SCDHEC) that fecal coliform levels in the May River headwaters were increasing and in 2009 the river received a shellfish harvesting classification down-grade. In response to this down-grade, the Town of Bluffton, with Beaufort County and stakeholders, committed to take action to restore shellfish harvesting in the river and to prevent further degradation to the river. Following the U.S. EPA (EPA) guidelines for developing watershed plans, Town staff worked for nearly a year with consultants, Beaufort County, topic experts and local residents to develop the May River Watershed Action Plan which was adopted by Town Council in November 2011.

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Comparison of the community composition of aquatic insects between wetlands with and without the presence of Procambarus clarkii: a case study from Japanese wetlands

Biological Invasions ◽

10.1007/s10530-021-02700-7 ◽

2022 ◽

Author(s):

Reiya Watanabe ◽

Shin–ya Ohba

Keyword(s):

Community Composition ◽

Aquatic Insects ◽

Procambarus Clarkii

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Coal dust emissions: From environmental control to risk minimization by underground transport. An applicative case-study

Process Safety and Environmental Protection ◽

10.1016/j.psep.2013.01.002 ◽

2014 ◽

Vol 92 (2) ◽

pp. 150-159 ◽

Cited By ~ 37

Author(s):

B. Fabiano ◽

F. Currò ◽

A.P. Reverberi ◽

E. Palazzi

Keyword(s):

Environmental Control ◽

Coal Dust ◽

Risk Minimization ◽

Dust Emissions

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THE AQUATIC DANCE FLY FAUNA OF A SUBARCTIC RIVER SYSTEM IN QUÉBEC, WITH THE DESCRIPTION OF A NEW SPECIES OF HEMERODROMIA (DIPTERA: EMPIDIDAE)

The Canadian Entomologist ◽

10.4039/ent1171379-11 ◽

1985 ◽

Vol 117 (11) ◽

pp. 1379-1386 ◽

Cited By ~ 6

Author(s):

Bernard Landry ◽

P.P. Harper

Keyword(s):

New Species ◽

Aquatic Insects ◽

River System ◽

James Bay ◽

Baseline Study ◽

Hydroelectric Project ◽

Emergence Patterns ◽

A New Species ◽

Dance Fly ◽

Made In

AbstractAs part of a preimpoundment baseline study in the James Bay Hydroelectric Project in Northwestern Québec, systematic collections of aquatic insects were made in 1974 and 1975 in lakes and streams of the Rivière du Castor drainage. The aquatic Empididae are reported on here: they comprise 12 species, one of which is new (Hemerodromia fibrina n. sp.). Except for the boreal Metachela albipes, the fauna is remarkably temperate in character and composition. Emergence patterns are similar, though foreshortened, to those observed in southern Québec, and there are no bivoltine species. Most species are lotic and many thrive in fast waters (Neoplasm scapularis, Roederiodes recurvatus), but there is nevertheless a distinct lacustrine fauna (H. fibrina and perhaps also Chelifera rastrifera). The bog stations harbored only the widespread Chelifera palloris.

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Environmental control of Northeast Atlantic mackerel (Scomber scombrus) recruitment in the southern Bay of Biscay: case study of failure in the year 2000

Fisheries Oceanography ◽

10.1111/j.1365-2419.2011.00592.x ◽

2011 ◽

Vol 20 (5) ◽

pp. 397-414 ◽

Cited By ~ 7

Author(s):

B. VILLAMOR ◽

C. GONZALEZ-POLA ◽

A. LAVÍN ◽

L. VALDÉS ◽

A. LAGO DE LANZÓS ◽

...

Keyword(s):

Environmental Control ◽

Bay Of Biscay ◽

Northeast Atlantic ◽

Atlantic Mackerel ◽

Scomber Scombrus ◽

Year 2000

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A Case Study of How Vertical Spindle Pulverizer Performance is Related to Overall Plant Performance

ASME 2006 Power Conference ◽

10.1115/power2006-88156 ◽

2006 ◽

Author(s):

Stephen K. Storm ◽

Richard F. Storm ◽

Daniel S. Storm ◽

Sammy Tuzenew ◽

Adam McClellan

Keyword(s):

Performance Optimization ◽

Electrostatic Precipitator ◽

Environmental Control ◽

Heat Rate ◽

Field Testing ◽

Plant Performance ◽

Performance Improvements ◽

Super Heater ◽

Generation Costs

Pulverizer performance optimization is the first step to a successful combustion optimization program and the inter-relationships of the pulverizers must be considered when attempting to optimize combustion, overall unit performance, operability, reliability, and capacity. Pulverizer capacity seems to be an industry challenge while many units today are undergoing drastic fuel changes. Considering there seems to be a huge disconnect when correlating mill performance with such issues as fuel line distribution, heat rate, NOx and environmental control equipment performance, it is the intent of this technical paper to provide better understanding of how mechanical optimization & tuning of the pulverizers can yield overall improved plant performance. Low NOx firing and/or optimization of the burner belt combustion with a limited amount of furnace residence time is absolutely essential to optimizing plant performance. For example, when pulverizer performance is poor, it is also often related to not only high furnace exit gas temperatures, increased slagging and/or high LOI, but also degrading electrostatic precipitator (ESP) performance from the coarse particle ash. Furthermore, reliability of the boiler (ie. tube leaks, fouling, and slagging) can also be impacted negatively by secondary combustion and consequent super heater and re-heater tube metals overheating and/or wall wastage often occurs from non-optimized fuel distribution being delivered from the pulverizers. Whether the reason for improving mill performance is for the aforementioned items and/or perhaps simply to reduce power generation costs with improved fuels flexibility, the purpose of this case study is to review the basics of vertical spindle mill performance improvements. The data used to support this paper is from a compilation of actual field testing & tuning results. Furthermore, Storm Technologies, Inc. (STI) suggests the aforementioned steps as an effective approach to optimization.

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Comparison of the effects of using local and central snow deposits: a case study in Luleå

Water Science & Technology ◽

10.2166/wst.2003.0496 ◽

2003 ◽

Vol 48 (9) ◽

pp. 71-79 ◽

Cited By ~ 4

Author(s):

K. Reinosdotter ◽

M. Viklander ◽

P.-A. Malmqvist

Keyword(s):

Environmental Control ◽

Growing Season ◽

General Information ◽

Public Acceptance ◽

Local Effects ◽

Realistic Option ◽

Increased Risk ◽

Land Use Effects ◽

Made In

The aim of the study was to determine if an increased use of local land-based snow deposits would be more sustainable than the use of a central snow deposit. The study focused on transport related emissions, costs for transporting the snow, technical attendance, local effects, public acceptance, land use, effects on the recipient environmental control and potential for accidents. General information was obtained from an inventory regarding snow handling that was made in 14, geographically spread, Swedish municipalities during 2001. The comparison of costs for transporting snow and transport-related emissions was based on information gathered from the municipality of Luleå. The study showed that using local land-based snow deposits would decrease traffic-related emissions such as CO2, CO and NOx by 40% annually and would decrease the annual cost for transporting snow by nearly 80%. On the other hand local snow deposits may lead to an increased risk of accidents and to negative local effects such as delayed growing season, flooding and drainage problems. Available land for local snow deposits in the cities is hard to find, and is usually expensive. Therefore a combination of local and central snow deposits is likely to be the most realistic option.

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Environmental Control on Transpiration: A Case Study of a Desert Ecosystem in Northwest China

Water ◽

10.3390/w12041211 ◽

2020 ◽

Vol 12 (4) ◽

pp. 1211 ◽

Cited By ~ 1

Author(s):

Shiqin Xu ◽

Zhongbo Yu

Keyword(s):

Sap Flow ◽

Environmental Control ◽

Arid Ecosystems ◽

Desert Ecosystem ◽

Time Lags ◽

Evaporative Demand ◽

Threshold Control ◽

Stand Transpiration ◽

Semi Arid

Arid and semi-arid ecosystems represent a crucial but poorly understood component of the global water cycle. Taking a desert ecosystem as a case study, we measured sap flow in three dominant shrub species and concurrent environmental variables over two mean growing seasons. Commercially available gauges (Flow32 meters) based on the constant power stem heat balance (SHB) method were used. Stem-level sap flow rates were scaled up to stand level to estimate stand transpiration using the species-specific frequency distribution of stem diameter. We found that variations in stand transpiration were closely related to changes in solar radiation (Rs), air temperature (T), and vapor pressure deficit (VPD) at the hourly scale. Three factors together explained 84% and 77% variations in hourly stand transpiration in 2014 and 2015, respectively, with Rs being the primary driving force. We observed a threshold control of VPD (~2 kPa) on stand transpiration in two-year study periods, suggesting a strong stomatal regulation of transpiration under high evaporative demand conditions. Clockwise hysteresis loops between diurnal transpiration and T and VPD were observed and exhibited seasonal variations. Both the time lags and refill and release of stem water storage from nocturnal sap flow were possible causes for the hysteresis. These findings improve the understanding of environmental control on water flux of the arid and semi-arid ecosystems and have important implications for diurnal hydrology modelling.

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