DEVELOPMENT OF A STOCHASTIC WATER TEMPERATURE MODEL AND PROJECTION OF FUTURE WATER TEMPERATURE AND EXTREME EVENTS IN THE OUELLE RIVER BASIN IN QUÉBEC, CANADA

Rhinelepis aspera is the largest Loricariidae species found in the São Francisco river basin where it is now rarely caught. Brooders kept in tanks were hypophysed with crude carp pituitary extract (CCPE). Approximately 82% of the females responded positive to the treatment. The egg was opaque, demersal, round, yellow and adhesive. Egg stripping was done at 212 hour-degrees (= 8.2 h) after application of the second dose of CCPE (water temperature = 25-26 ºC). Hatching of the larvae occurred at 1022 hour-degrees (= 42.2 h), after fertilization of the eggs (water temperature =24-25 ºC). Fertilization rate of the eggs was 72%. Absolute fecundity (AF), initial fertility (IF) and final fertility (FF) in relation to the females' body weight are expressed, respectively, by the equations: AF = - 33993 + 122308 Wt (r² = 0.88), IF = - 14823 + 58619 Wt (r² = 0.71) and FF = - 6553 + 29741 (r² = 0.61)

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Assessment of flash floods taking into account climate change scenarios in the Llobregat River basin

Natural Hazards and Earth System Science ◽

10.5194/nhess-13-3145-2013 ◽

2013 ◽

Vol 13 (12) ◽

pp. 3145-3156 ◽

Cited By ~ 9

Author(s):

M. Velasco ◽

P. A. Versini ◽

A. Cabello ◽

A. Barrera-Escoda

Keyword(s):

River Basin ◽

Extreme Events ◽

Hydrological Model ◽

Flash Flood ◽

Flash Floods ◽

Climate Change Scenarios ◽

Whole Process ◽

The Future ◽

Peak Over Threshold ◽

Llobregat River

Abstract. Global change may imply important changes in the future occurrence and intensity of extreme events. Climate scenarios characterizing these plausible changes were previously obtained for the Llobregat River basin (NE Spain). This paper presents the implementation of these scenarios in the HBV (Hydrologiska Byråns Vattenbalansavdelning) hydrological model. Then, the expected changes in terms of flash flood occurrence and intensity are assessed for two different sub-basins: the Alt Llobregat and the Anoia (Llobregat River basin). The assessment of future flash floods has been done in terms of the intensity and occurrence of extreme events, using a peak over threshold (POT) analysis. For these two sub-basins, most of the simulated scenarios present an increase of the intensity of the peak discharge values. On the other hand, the future occurrence follows different trends in the two sub-basins: an increase is observed in Alt Llobregat but a decrease occurs in Anoia. Despite the uncertainties that appear in the whole process, the results obtained can shed some light on how future flash floods events may occur.

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Range and Standard of Yang Dongfang Spatial Water Temperature Variation Angle I. Spatial Water Temperature Model Calculation

Journal of Physics Conference Series ◽

10.1088/1742-6596/1486/3/032034 ◽

2020 ◽

Vol 1486 ◽

pp. 032034

Author(s):

Dongfang Yang ◽

Haoyuan Ren ◽

Dong Yang ◽

Longlei Zhang ◽

Haixia Li

Keyword(s):

Water Temperature ◽

Model Calculation ◽

Temperature Variation ◽

Temperature Model

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Development and validation of a drinking water temperature model in domestic drinking water supply systems

Urban Water Journal ◽

10.1080/1573062x.2017.1325501 ◽

2017 ◽

Vol 14 (10) ◽

pp. 1031-1037 ◽

Cited By ~ 4

Author(s):

Ljiljana Zlatanovic ◽

Andreas Moerman ◽

Jan Peter van der Hoek ◽

Jan Vreeburg ◽

Mirjam Blokker

Keyword(s):

Drinking Water ◽

Water Supply ◽

Water Temperature ◽

Drinking Water Supply ◽

Water Supply Systems ◽

Temperature Model ◽

Development And Validation ◽

Supply Systems

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Assessing the impacts of hydrologic and land use alterations on water temperature in the Farmington River basin in Connecticut

Hydrology and Earth System Sciences ◽

10.5194/hess-23-4491-2019 ◽

2019 ◽

Vol 23 (11) ◽

pp. 4491-4508 ◽

Cited By ~ 5

Author(s):

John R. Yearsley ◽

Ning Sun ◽

Marisa Baptiste ◽

Bart Nijssen

Keyword(s):

Land Use ◽

Water Temperature ◽

River Basin ◽

Land Surface ◽

Canopy Cover ◽

River System ◽

Stream Temperature ◽

Hydrologic Model ◽

Riparian Buffers ◽

Connecticut River

Abstract. Aquatic ecosystems can be significantly altered by the construction of dams and modification of riparian buffers, and the effects are often reflected in spatial and temporal changes to water temperature. To investigate the implications for water temperature of spatially and temporally varying riparian buffers and dam-induced hydrologic alterations, we have implemented a modeling system (DHSVM-RBM) within the framework of the state-space paradigm that couples a spatially distributed land surface hydrologic model, DHSVM, with the distributed stream temperature model, RBM. The basic modeling system has been applied previously to several similar-sized watersheds. However, we have made enhancements to DHSVM-RBM that simulate spatial heterogeneity and temporal variation (i.e., seasonal changes in canopy cover) in riparian vegetation, and we included additional features in DHSVM-RBM that provide the capability for simulating the impacts of reservoirs that may develop thermal stratification. We have tested the modeling system in the Farmington River basin in the Connecticut River system, which includes varying types of watershed development (e.g., deforestation and reservoirs) that can alter the streams' hydrologic regime and thermal energy budget. We evaluated streamflow and stream temperature simulations against all available observations distributed along the Farmington River basin. Results based on metrics recommended for model evaluation compare well to those obtained in similar studies. We demonstrate the way in which the model system can provide decision support for watershed planning by simulating a limited number of scenarios associated with hydrologic and land use alterations.

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Prévision des températures de l'eau en rivières à l'aide d'un modèle conceptuel : le cas de la rivière Moisie

Canadian Journal of Civil Engineering ◽

10.1139/l94-006 ◽

1994 ◽

Vol 21 (1) ◽

pp. 63-75 ◽

Cited By ~ 10

Author(s):

Guy Morin ◽

Tonino-Joseph Nzakimuena ◽

Wanda Sochanski

Keyword(s):

Solar Radiation ◽

Water Temperature ◽

Energy Budget ◽

Production Capacity ◽

Short Wave ◽

Wave Radiation ◽

Temperature Model ◽

Salmon River ◽

Daily Data ◽

Temperature Impacts

Hydro-Québec is projecting to increase the hydroelectric production capacity of the St. Marguerite River by diversion of the tributaries Pékans and Carheil rivers of the Moisie River, the most productive salmon river of the whole Quebec. Along with substantial changes in hydrological regimes, this hydroelectric development is most likely to affect some physical environment factors such as the water temperature, which is of prime importance for the biotope and, in particular, for the salmon productivity. The objective of the present study is to simulate, over a long period of time, the river water temperatures under natural conditions as compare to those after the impoundment, to assess the consequences of the tributary diversion. We used the hydrological CEQUEAU model coupled with a temperature model.The temperature model developed is applicable to the ice-free period and calculates daily water temperatures in rivers by computing an energy budget to each element of the watershed. The energy budget considers the short-wave solar radiation, long-wave radiation, evaporation, and convection in the air as well as the advective heat of various inflows from surface runoff, interflow, and groundwaters. The estimation of the atmospheric thermal exchanges is based on the equations usually found in literature. The volumes of the various inflows are given by the hydrological model. The temperature model uses daily data for air temperature and monthly data for solar radiation, cloudiness, wind speed, and vapour pressure.The model has been applied to the Moisie River (Québec), using the measured values for the calibration. Both observed and calculated values show good agreement. The model was also used to simulate, over the whole watershed, the water temperatures for the 1961–1989 period and after the diversion. The results show that the tributary diversion contributed to increase the water temperature of the Moisie River and that this increase is gradually attenuated as we progress downstream. Key words: temperature, impacts, model, Moisie, Québec, diversion, hydrology.

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Environmental Variables of the Seti Gandaki River Basin Pokhara, Nepal

Journal of Institute of Science and Technology ◽

10.3126/jist.v22i2.19604 ◽

2018 ◽

Vol 22 (2) ◽

pp. 129-139 ◽

Cited By ~ 2

Author(s):

Kishor Kumar Pokharel ◽

Khadga Bahadur Basnet ◽

Trilok Chandra Majupuria ◽

Chitra Bahadur Baniya

Keyword(s):

Water Temperature ◽

River Basin ◽

Environmental Variables ◽

Temporal Variations ◽

Total Alkalinity ◽

Urban Site ◽

Water Conductivity ◽

Free Carbon Dioxide ◽

Spatio Temporal ◽

Carbon Dioxide Co2

Present paper focuses on the spatio-temporal variations and correlations among the environmental variables of the Seti Gandaki River basin, Pokhara, Nepal. A total of five sites, three along the river and two in tributaries were selected for this study. Water sampling was done fortnightly for environmental variables following standard methods during July 2011 to June 2012. Mean and standard deviation of the environmental variables revealed that the depth (0.9 ± 0.3), pH (8 ± 0.4), total phosphates (PO4) (0.10 ± 0.03) and nitrates (NO3) (0.13 ± 0.04) were normally variable among the sites. But the discharge (40.00 ± 37.00), width (32.30 ± 13.00), turbidity (81.40 ± 51.00), transparency (29.10 ± 15.00), conductivity (166.00 ± 80.00), water temperature (18.00 ±4.00), dissolved oxygen (DO) (8.00 ± 2.00), free carbon dioxide (CO2) (7.00 ± 2.00) and total alkalinity (98.00 ± 22.00) varied among sites equally. Correlation coefficient between the sites and environmental variables revealed that sites were found significantly correlated with water conductivity (r2 = 0.6), DO (r2 = -0.52), and free CO2 (r2 = 0.6); depth of water with width (r2 = 0.94), discharge (r2 = 0.96), turbidity (r2 = 0.71), transparency (r2 = -0.62), water temperature (r2 = 0.60), pH (r2 = -0.52) and DO (r2 = -0.48); water temperature with pH (r2 = -0.54), DO (r2 = -0.79), free CO2 (r2 = 0.69), total alkalinity (r2 = -0.58), total PO4 (r2 = 0.54) and NO3 (r2 = 0.62), etc. The enhancement of turbidity, conductivity, free CO2, phosphates and nitrates, while, suppression of transparency, pH and DO at the urban site indicated the urban influence. Journal of Institute of Science and TechnologyVolume 22, Issue 2, January 2018, page: 129-139

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