Showing papers in "Journal of Hydro-environment Research in 2012"

TL;DR: Two adapted versions of Particle Swarm Optimization algorithm are presented for the efficient solution of large scale reservoir operation problems with release volumes taken as the decision variables of the problem and shown to be superior to the original PSO and genetic algorithm in locating near optimal solutions and convergence characteristics.

TL;DR: In this article, the tracer concentration field is measured for six jet discharge angles: (15°, 30°, 38°, 45°, 52°, & 60°) using the planar laser-induced fluorescence (LIF) technique; selected jet velocity measurements are made using Particle Image Velocimetry (PIV).

TL;DR: In this article, the authors present that the particular flood event had significantly greater impact on water quality than the period of drought even if for only a very short time, and compare the knowledge of impacts of floods and droughts collected from literature.

TL;DR: In this paper, Zheng et al. used a state-of-the-art model, CDOG, to simulate the behavior of an oil and gas spill in deepwater and showed that plumes of oil can be formed and stay submerged for long periods of time when very small (less than 0.5mm in diameter) oil droplets are present.

TL;DR: In this paper, a reservoir operation simulation study is carried out to analyze the impact of alternative scenarios of a hydropower system operation on energy production and natural flow regime in the La Nga river basin in Vietnam.

TL;DR: In this article, a comprehensive study of beach water quality prediction has been carried out for four representative beaches in Hong Kong: Big Wave Bay (BW), Deep Water Bay (DW), New Cafeteria (NC) and Silvermine Bay (SIL).

TL;DR: In this article, the authors presented the results of an application of a floodplain dynamic model to the Nakdong River, South Korea, and the relationship between the hydrology alterations induced by dams and the successional changes in riparian vegetation.

TL;DR: In this article, a series-integral-based mathematical method, called the variational iteration method, is used, and a semi-exact solution is derived for the instantaneous velocity of the particle versus time.

TL;DR: In this article, a comprehensive laboratory study on the hydraulic resistance characteristics due to a group of slender cylindrical members representing flexible plantation has been carried out in a laboratory open channel.

TL;DR: In this article, the state of the art on the topic of flow structure and scour around circular compound piers is presented, which reveals that variations in foundation and pier geometry significantly affect the maximum depth of scour and its temporal variation.

TL;DR: In this article, the modeling results of two rivers in Taiwan are presented to demonstrate the associated technical issues and difficulties, as well as recommend further effort to meet these challenges, which is a different modeling approach must be adopted to address technical challenges associated with modeling for water quality management.

TL;DR: In this article, total coliform, thermotolerant coliforms, Escherichia coli and groundwater nitrate concentration were monitored at 127 groundwater sampling points (only 62 water points for bacteriological parameters) located in the southern part of Abidjan District.

TL;DR: In this paper, the authors provide algorithms to calculate longitudinal dispersion coefficients using ADCP data driven by either vertical or transverse velocity gradients in large river, and describe software components capitalizing on these ADCP measurement capabilities to provide the longitudinal data based on in-situ measurements.

TL;DR: In this article, the authors introduced an effective approach based on circular statistics for assessing the seasonality of extreme precipitation, which explicitly reflect the seasonal pattern of precipitation with maximum frequency of the timing of daily and monthly maximums.

TL;DR: In this paper, a combination technique between PIV and planar laser-induced fluorescence (LIF) was developed by using two sets of CCD cameras, to measure the instantaneous velocity and concentration field simultaneously.

TL;DR: In this paper, a series of laboratory experiments have been conducted for negatively buoyant effluents discharged through a protruding surface channel into unstratified stagnant water, and the mixing behavior of the flow has been analyzed using digital video recordings of the dye colored discharge together with micro conductivity probe measurements.

TL;DR: In this paper, a model is developed to simulate CO 2 gas releases from moderate ocean depths, where the model uses multi-species Lagrangian parcels approach to model CO 2 in both gas and dissolved gas phases.

TL;DR: In this article, the authors report spatial and temporal variations of algal bloom events in these waters from 1993 to 2007, and provide a compiled scientific reference that may be used for later prediction of Harmful algal blooms (HABs).

TL;DR: In this article, the effects of flood waves on urban areas due to a dam failure are numerically investigated based on two physical experiments and a field study case, and the predicted water depths are consistent with available laboratory measurements.

TL;DR: An integrated washland optimization model that is developed to evaluate flood mitigation alternatives by installation of washlands in a large watershed is introduced, aimed at encouraging collaboration between channels and basin storage for burden-sharing in the whole basin.

TL;DR: In this article, slow freezing was employed vertically as well as horizontally through solutions and suspensions, and the impurities (soluble salts and suspended materials) were appreciably forced out by dynamic freezing front.

TL;DR: In this paper, the authors investigated the morphological characteristics of refugia where riverine plants survived large floods and found that the Anaphalis margaritacea community is maintained at locations where the local shear-stress at peak discharge in large-floods does not exceed a critical value.

TL;DR: In this paper, the authors measured a range of habitat characteristics and collected samples of stream invertebrates in the reaches above and below a series of water storage dams in three river systems.

TL;DR: In this article, the authors used the streamlined upwind Petrov-Galerkin (SUPG) finite element scheme to solve the Reynolds-averaged turbulent flow equations to estimate the maximum scour depth, determine the configuration of the cofferdam, and suggest changes to reduce any local scour.

TL;DR: In this paper, a physical-based distributed runoff model for flood simulation considering spatially and temporally varied rainfall was developed, and an auto-calibration method for initial soil moisture conditions that have an effect on discharge was proposed.

TL;DR: In this article, Zhou et al. studied the effect of coarse sediment (d ǫ> 0.08-0.1mm) on the Lower Yellow River siltation and showed that persistent dredging here in a fixed dredging basin (FDB) can remove most CS and prevent it from entering the LYR.

TL;DR: In this paper, a numerical model that is capable of simulating the morphological process of the trapezoidal open-channel is presented, where the lateral distribution model, which distributes the unit discharge over the width, is used for the flow analysis.

TL;DR: In this paper, the results of four common uncertainty models using an example of contaminant transport in groundwater were compared to evaluate the capabilities of these methods, and the comparison showed that P-Box method provides a more comprehensive analysis with lesser assumptions as compared to other methods.

TL;DR: In this paper, the identification of virus transport parameters in groundwater from the virus concentration data using inverse procedure is discussed and the parameters are estimated by minimizing the deviations between the model predicted and experimentally observed virus concentrations.