scholarly journals Effect of Farmers’ Water Management on Water Temperature Changes in Paddy Area with Independent Irrigation and Drainage Canal Settings

2018 ◽  
Vol 52 (3) ◽  
pp. 241-248
Author(s):  
Mami SHIMMURA ◽  
Tomoyuki TANIGUCHI ◽  
Ryosuke KOTATSU ◽  
Atsushi ISHII
Keyword(s):  
Water Management ◽  
Water Temperature ◽  
Temperature Changes ◽  
Drainage Canal ◽  
Paddy Area

scholarly journals Comparison of Invasive Apple Snail (Pomacea canaliculata) Behaviors in Different Water Temperature Gradients

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1149
Author(s):  
Mi-Jung Bae ◽  
Eui-Jin Kim ◽  
Young-Seuk Park
Keyword(s):  
Water Temperature ◽  
Farming Systems ◽  
Freshwater Snail ◽  
Freshwater Ecosystems ◽  
Pomacea Canaliculata ◽  
Activity Levels ◽  
Self Organizing Map ◽  
Apple Snail ◽  
Temperature Changes ◽  
Organic Farming Systems

Pomacea canaliculata (known as invasive apple snail) is a freshwater snail native to South America that was introduced into many countries (including Asia and North America) as a food source or for organic farming systems. However, it has invaded freshwater ecosystems and become a serious agricultural pest in paddy fields. Water temperature is an important factor determining behavior and successful establishment in new areas. We examined the behavioral responses of P. canaliculata with water temperature changes from 25 °C to 30 °C, 20 °C, and 15 °C by quantifying changes in nine behaviors. At the acclimated temperature (25 °C), the mobility of P. canaliculata was low during the day, but high at night. Clinging behavior increased as the water temperature decreased from 25 °C to 20 °C or 15 °C. Conversely, ventilation and food consumption increased when the water temperature increased from 25 °C to 30 °C. A self-organizing map (an unsupervised artificial neural network) was used to classify the behavioral patterns into seven clusters at different water temperatures. These results suggest that the activity levels or certain behaviors of P. canaliculata vary with the water temperature conditions. Understanding the thermal biology of P. canaliculata may be crucial for managing this invasive snail.

The water temperature changes the effect of pH on copper toxicity to the green microalgae Raphidocelis subcapitata

Chemosphere ◽  
2021 ◽  
pp. 133110
Author(s):  
Gissela Pascual ◽  
Daisuke Sano ◽  
Takashi Sakamaki ◽  
Michihiro Akiba ◽  
Osamu Nishimura
Keyword(s):  
Water Temperature ◽  
Copper Toxicity ◽  
Green Microalgae ◽  
Effect Of Ph ◽  
Temperature Changes ◽  
Raphidocelis Subcapitata

scholarly journals Linking groundwater – surface water exchange to food production and salmonid growth

2016 ◽  
Vol 73 (11) ◽  
pp. 1650-1660 ◽  
Author(s):  
Francine H. Mejia ◽  
Colden V. Baxter ◽  
Eric K. Berntsen ◽  
Alexander K. Fremier
Keyword(s):  
Surface Water ◽  
Water Temperature ◽  
Food Production ◽  
Water Exchange ◽  
Fish Growth ◽  
Nutrient Inputs ◽  
Resource Subsidies ◽  
Temperature Changes ◽  
Energetic Condition ◽  
Nitrogen Concentrations

Materials, energy, and organisms from groundwater serve as resource subsidies to lotic systems. These subsidies influence food production and post-emergent fish growth and condition through nutrient inputs and water temperature changes. To test whether post-emergent fish grew faster in gaining sites, we grew hatchery post-emergent salmon in enclosures, sampled periphyton, benthic invertebrates, and wild salmon, and modeled fish growth across a gradient of groundwater – surface water exchange. Fish grew almost twice as fast in gaining (2.7%·day−1) than in losing (1.5%·day−1) sites. Fish from transient sites grew as much as gaining sites, but their condition was significantly lower (18.3% vs. 20.7%). Results suggest that groundwater – surface water exchange affects fish growth and energetic condition through direct and indirect pathways. Elevated nitrogen concentrations and consistently warmer water temperature in gaining sites have a strong effect on basal production with subsequent effects on invertebrate biomass, fish growth, and condition. Findings highlight the importance of groundwater – surface water exchange as a subsidy to rearing salmon and may inform strategies for restoring fish rearing habitat.

Water Temperature Changes

1999 ◽  
Vol 25 (5) ◽  
pp. 422
Author(s):  
Rhoda S. Narins
Keyword(s):  
Water Temperature ◽  
Temperature Changes

Closed Cooling Water Heat Exchanger Design for Higher Tube Inlet Water Temperature

2013 ◽  
Author(s):  
Thomas J. Muldoon ◽  
Joseph A. Bruno
Keyword(s):  
Heat Exchanger ◽  
Water Temperature ◽  
Cooling Water ◽  
Maximum Temperature ◽  
Temperature Changes ◽  
Cooling Water Temperature ◽  
Heat Exchanger Design ◽  
Load Demand ◽  
Service Water ◽  
Winter Operation

When the maximum temperature of cooling water slowly increases with temperature changes and shifting climate patterns, smaller LMTD’s (log mean temperature differences) for the CCW’s to meet the same performance heat rejection. Making the issue more critical is that the peak cooling water temperatures will usually occur at the same time as peak summer load demand. A smaller LMTD means a larger heat exchanger and more effective tubing surface area. More surface, means more tubing or smaller diameter tubing. If the original LMTD was 12 °F, a 1 degree change may mean an increase of 9%. To maintain the same nozzle locations on a replacement exchanger means a smaller tube outside diameter and/or a larger shell. Such increases are necessary for the high summer load conditions with the highest inlet water temperatures. At lower water temperatures, the amount of excess thermal capability can become a performance and corrosion issue as the water flows are modulated to meet temperatures. To help reduce these problems, a design which allows operation with reduced surface at low temperatures is appropriate. The temperature approach (Cooling Water Out – Service Water In) based on the higher inlet cooling water temperature can be significantly smaller than when the CCW was originally designed. This paper will address a design configuration that will work with both higher summer temperature cooling water with the flexibility of using less water for cooler winter operation. The overall affect is less pumping power during colder months, more consistent tube velocities which will help with heat transfer, and minimization of sediment settling in the tubes due to lower velocities.

scholarly journals Investigations of hot water temperature changes at the pipe outflow

2017 ◽  
Vol 22 ◽  
pp. 00186 ◽  
Author(s):  
Janusz Wojtkowiak ◽  
Czesław Oleśkowicz-Popiel
Keyword(s):  
Water Temperature ◽  
Hot Water ◽  
Temperature Changes

scholarly journals Canal network effects on the water balance in southeastern Srem

2009 ◽  
Vol 54 (2) ◽  
pp. 118-134
Author(s):  
Enike Gregoric
Keyword(s):  
Water Management ◽  
Water Balance ◽  
Network Effects ◽  
Potential Evapotranspiration ◽  
Drainage System ◽  
Multiple Regression Model ◽  
Analytical Relationship ◽  
Drainage Canal ◽  
Precipitation Total ◽  
Canal Network

This paper presents the results of research and analyses of the effects of a drainage canal network on the water balance of southeastern Srem. The paper was derived from a doctoral thesis which contains a detailed study of key components of the water balance of southeastern Srem, including actual amounts of water removed via the drainage canal network. A linear multiple regression model was used to establish an analytical relationship between the amounts of evacuated water (a dependent variable) and four key parameters (total precipitation, total potential evapotranspiration, average stage of the Sava River, and average groundwater level - independent variables). This correlation allows for the forecasting of hydrologic events based on historic measured data and provides answers to some important questions regarding water management and soil conservation practices. The efficiency of the drainage canal network is closely linked with its maintenance. The paper shows that canal maintenance is inadequate, mainly due to financial issues. In some parts of the studied area, drainage canals have become virtual open sewers. For this reason, the future development of the drainage system must be part of comprehensive and integrated water management in southeastern Srem. .

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