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Mostrando ítems 11-20 de 491
Implementation of the Kalman Filter for a Geostatistical Bivariate Spatiotemporal Estimation of Hydraulic Conductivity in Aquifers
(MDPI, 2020-11)
The estimation of the hydraulic parameters of an aquifer such as the hydraulic conductivity is somehow complicated due to its heterogeneity, on the other hand field and laboratory tests are both time consuming and costly. ...
LOCAL HEAD LOSS OF NON-COAXIAL EMITTERS INSERTED IN POLYETHYLENE PIPE
(AMER SOC AGRICULTURAL & BIOLOGICAL ENGINEERS, 2009)
The design of a lateral line for drip irrigation requires accurate evaluation of head losses in not only the pipe but in the emitters as well. A procedure was developed to determine localized head losses within the emitters ...
Modeling of hydraulic and energy efficiency indicators for water supply systems
(Elsevier B.V., 2015)
Measuring Hydraulic Conductivity to Wilting Point Using Polymer Tensiometers in an Evaporation Experiment
(SOIL SCI SOC AMER, 2011)
The polymer tensiometer is a novel instrument to measure soil water pressure heads from saturation to permanent wilting conditions. We used tensiometers of this type in an experiment to determine the hydraulic properties ...
Spatial variability of soil hydraulic properties on a steep slope in the loess plateau of China
(São Paulo - Escola Superior de Agricultura Luiz de Queiroz, 2008)
The understanding of the structure of the spatial variability of soil surface hydraulic properties on steep slopes is important for modeling infiltration and runoff processes. The objective of this study was to investigate ...
An optimization model for operations of large scale hydro power plants
(Institute of Electrical and Electronics Engineers, 2020-09)
Globally, there is an increase in the proportion of renewable sources for electricity generation. Among renewable sources, hydropower is the most widespread. For this reason, the improvements of their applications have ...
Simple functions for describing soil water retention and the unsaturated hydraulic conductivity from saturation to complete dryness
(2020-09-01)
Many applications require accurate soil hydraulic functions that can describe the dynamics of water in variably saturated systems from full saturation to complete dryness. Current functions considering zero water content ...
Hydraulic model of the energy-dissipating stilling basin of a Howell-Bunger valve
(THOMAS TELFORD SERVICES LTD, 2002)
The traditional design for a Howell-Bunger stilling basin has a valve discharging at atmospheric pressure, a channel with a 30degrees bottom slope and an end still. The design produces an adequate dissipation of energy and ...
Closed-form hydraulic conductivity equations for multimodal unsaturated soil hydraulic properties
(2022-01-01)
Closed-form expressions of the hydraulic conductivity function for linearly superposed subretention (multimodal) functions were derived for arbitrary sets of the Brooks and Corey (BC), van Genuchten (VG), and Kosugi (KO) ...
Tide-induced head fluctuations in coastal aquifers of variable thickness
(John Wiley & Sons Ltd, 2020-10-15)
In this work, a new analytical solution to describe tide-induced head fluctuations in aquifers of variable thickness is presented. The proposed model assumes a finite and confined aquifer with a thickness that increases ...