Deuterium depletion in xylem water and soil isotopic effects complicate the assessment of riparian tree water sources in the seasonal tropics

Ecohydrology ◽  
2021 ◽  
Author(s):  
Clément Duvert ◽  
Caroline A. Canham ◽  
Adrià Barbeta ◽  
Diego Alvarez Cortes ◽  
Lisa Chandler ◽  
...  
Keyword(s):  
Water Sources ◽  
Riparian Tree ◽  
Isotopic Effects

Seasonal variation in water sources of the riparian tree species Acer negundo and Betula nigra, southern Appalachian foothills, USA

Botany ◽  
2015 ◽  
Vol 93 (8) ◽  
pp. 519-528 ◽  
Author(s):  
Joseph C. White ◽  
William K. Smith
Keyword(s):  
Water Sources ◽  
Southern Appalachians ◽  
Mixing Models ◽  
Woody Tissue ◽  
Phenological Stages ◽  
Soil Layers ◽  
Acer Negundo ◽  
Source Characteristics ◽  
Southern Appalachian ◽  
Riparian Tree

Determining which water sources a plant accesses throughout a year is an important step in understanding how changes in source characteristics affect utilization by plants. Water sources of Acer negundo L. and Betula nigra L. of the foothills of the southern Appalachians Mountains were examined during one full year, including the phenological stages of leaf bolt, flowering, and leaf senescence and abscission. Source utilization was monitored, comparing the isotopic composition of water samples from woody tissue with those of possible water sources at the site. Species used deep ground and shallow soil water, with a greater reliance on deeper sources during the late growing season. Betula nigra was typically more depleted in δ2H than all water sources measured, while values from A. negundo were more variable throughout the study. Intraspecifically, isotopic values did not vary monthly or seasonally for either species (P > 0.56), while interspecific values were different for December, January, and July samplings (P < 0.02). Positive relationships occurred between air temperature and isotopic values of both species (P < 0.04), and may reflect increased evaporation from the upper soil layers at warmer temperatures, which both species appeared to use. An inability to sample all sources prevented the application of mixing models and may weaken conclusions.

ISOTOPIC EFFECTS IN XPS SPECTRA OF H2O AND D2O

1987 ◽  
Vol 48 (C9) ◽  
pp. C9-789-C9-792 ◽  
Author(s):  
D. NORDFORS ◽  
S. SVENSSON ◽  
U. GELIUS
Keyword(s):  
Xps Spectra ◽  
Isotopic Effects

Brief history and ways of further development of the department of hydraulic engineering and hydraulics FSBI «VNIIGiM named after A.N. Kostyakov»

2020 ◽  
pp. 18-23
Author(s):  
Alexey Shcherbakov ◽  
Valentin Zhezmer
Keyword(s):  
Land Reclamation ◽  
Water Source ◽  
Water Sources ◽  
Hydraulic Engineering ◽  
Negative Effects ◽  
Extensive Experience ◽  
Safety Level ◽  
Theoretical Substantiation ◽  
Wide Range ◽  
Construction Operation

Department of hydraulic engineering and hydraulics FGBNU «VNIIGiM them. A.N. Kostyakova «has a long history. For many years, the department’s staff has been such scientists and water engineers with extensive experience as M.A. Volynov, V.S. Verbitsky, S.S. Medvedev, N.V. Lebedev, B.C. Panfilov, T.G. Voynich-Syanozhentsky, V.A. Golubkova, G.V. Lyapin and others. The department solved a wide range of tasks, the main areas of research were the following: – theoretical and applied hydrodynamics and hydraulics, with reference to the open channel flows that affect the state and level of safety of the hydraulic structures; – integrated use and protection of water bodies – water sources and water sources of water resources used in land reclamation; – development of measures and technical solutions for the protection of objects from the negative effects of water; – theoretical substantiation of works to improve the safety level of the GTS (declaration); – development and implementation of digitalization methods for solving design, construction, operation and control of landreclamation facilities. Currently, promising areas of research is the development of a decision-making algorithm in the designation of measures to rationalize the provision of resources to water amelioration. The algorithm is developed on the basis of a detailed study, systematization and processing of data both on safety and on the efficiency of systems and structures, ensuring the delivery of irrigation water of the required quality and in sufficient quantity from a water source to the field.

Managing seasonal man-made water sources: lessons from Botswana

Waterlines ◽  
1983 ◽  
Vol 1 (4) ◽  
pp. 22-25
Author(s):  
Louise Fortmann
Keyword(s):  
Water Sources

The rationality factor: Choosing water sources according to water uses

Waterlines ◽  
1994 ◽  
Vol 13 (2) ◽  
pp. 28-31 ◽  
Author(s):  
Astier Almedom ◽  
Christian Odhiambo
Keyword(s):  
Water Sources ◽  
Water Uses

Hygiene Aspects of Drinking Water Sources Used in Primary Milk Production

2016 ◽  
Vol 1 (6) ◽  
pp. 311-317
Author(s):  
Nada Sasakova ◽  
Gabriela Gregova ◽  
Jan Venglovsky ◽  
Ingrid Papajova ◽  
Bozena Nowakowicz-Debek ◽  
...  
Keyword(s):  
Drinking Water ◽  
Milk Production ◽  
Water Sources ◽  
Drinking Water Sources

AUTOMATIC WATER LEVEL MONITORING WITH IOT AND LPWAN

2019 ◽  
pp. 95-103
Author(s):  
Krum Videnov ◽  
Vanya Stoykova
Keyword(s):  
Water Level ◽  
Real Time ◽  
Early Warning ◽  
Water Sources ◽  
Water Levels ◽  
Water Level Fluctuations ◽  
Level Monitoring ◽  
Water Level Monitoring

Monitoring water levels of lakes, streams, rivers and other water basins is of essential importance and is a popular measurement for a number of different industries and organisations. Remote water level monitoring helps to provide an early warning feature by sending advance alerts when the water level is increased (reaches a certain threshold). The purpose of this report is to present an affordable solution for measuring water levels in water sources using IoT and LPWAN. The assembled system enables recording of water level fluctuations in real time and storing the collected data on a remote database through LoRaWAN for further processing and analysis.

Resorcinarene Cavitand Polymers for the Remediation of Halomethanes and 1,4-Dioxane

2019 ◽  
Author(s):  
Luke Skala ◽  
Anna Yang ◽  
Max Justin Klemes ◽  
Leilei Xiao ◽  
William Dichtel
Keyword(s):  
Drinking Water ◽  
Activated Carbon ◽  
High Capacity ◽  
The United States ◽  
Water Sources ◽  
Disinfection Byproducts ◽  
Porous Polymer ◽  
Organic Micropollutants ◽  
Executive Summary ◽  
Regulatory Limits

<p>Executive summary: Porous resorcinarene-containing polymers are used to remove halomethane disinfection byproducts and 1,4-dioxane from water.<br></p><p><br></p><p>Disinfection byproducts such as trihalomethanes are some of the most common micropollutants found in drinking water. Trihalomethanes are formed upon chlorination of natural organic matter (NOM) found in many drinking water sources. Municipalities that produce drinking water from surface water sources struggle to remain below regulatory limits for CHCl<sub>3</sub> and other trihalomethanes (80 mg L<sup>–1</sup> in the United States). Inspired by molecular CHCl<sub>3</sub>⊂cavitand host-guest complexes, we designed a porous polymer comprised of resorcinarene receptors. These materials show higher affinity for halomethanes than a specialty activated carbon used for trihalomethane removal. The cavitand polymers show similar removal kinetics as activated carbon and have high capacity (49 mg g<sup>–1</sup> of CHCl<sub>3</sub>). Furthermore, these materials maintain their performance in real drinking water and can be thermally regenerated under mild conditions. Cavitand polymers also outperform activated carbon in their adsorption of 1,4-dioxane, which is difficult to remove and contaminates many public water sources. These materials show promise for removing toxic organic micropollutants and further demonstrate the value of using supramolecular chemistry to design novel absorbents for water purification.<br></p>

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