Estimation of Water Environment Capacity:Example as Four Basin in Shandong Province, China

AbstractEstimating of the water environment capacity is an important content of the assessment of regional environmental impact. This article estimates the environmental capacity of surface water of the Yellow River basin, Haihe River basin, Huaihe River basin, Jiaodong Peninsula rivers basin in Shandong based on discussing the concept of water environmental capacity and estimation methods. This article selects the appropriate water quality model and determines the appropriate parameters looking the basin divided unit as the basic unit of the water environment capacity, based on the results of the division of surface water basin and the comprehensive comparison of the multiple water quality model. Then the author calculates the water environmental capacity and gets the control unit of the water environmental capacity, the results will be visualized feedback by GIS. The study has important reference value for assessment of regional environmental and a reasonable estimate of the water environmental capacity

Avaliação do potencial de transporte de agrotóxicos usados no Brasil por modelos Screening e planilha eletrônica.

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Numerical Simulations of Spread Characteristics of Toxic Cyanide in the Danjiangkou Reservoir in China under the Effects of Dam Cooperation

Many accidents of releasing toxic pollutants into surface water happen each year in the world. It is believed that dam cooperation can affect flow field in reservoir and then can be applied to avoiding and reducing spread speed of toxic pollutants to drinking water intake mouth. However, few studies investigated the effects of dam cooperation on the spread characteristics of toxic pollutants in reservoir, especially the source reservoir for water diversion with more than one dam. The Danjiangkou Reservoir is the source reservoir of the China’ South-to-North Water Diversion Middle Route Project. The human activities are active within this reservoir basin and cyanide-releasing accident once happened in upstream inflow. In order to simulate the spread characteristics of cyanide in the reservoir in the condition of dam cooperation, a three-dimensional water quality model based on the Environmental Fluid Dynamics Code (EFDC) has been built and put into practice. The results indicated that cooperation of two dams of the Danjiangkou Reservoir could be applied to avoiding and reducing the spread speed of toxic cyanide in the reservoir directing to the water intake mouth for water diversions

Institutional requirements for optimal water quality management in arid urban areas

Summarizes Completion reports no. 45-47.AER72-73WRW-GVS-RCW-TLH28.Funded in part by the United States Department of the Interior, Office of Water Resources Research, as authorized by the Water Resources Research Act of 1964, and pursuant to Grant Agreement no. 14-31-0001-3567

Analysis of a probabilistic approach for modelling and assessment of the water quality of rivers

Monitoring the ecological status of water bodies is crucial to guarantee human health and economic development. However, monitoring is often deficient in developing regions due to high installation and maintenance costs, thus it is frequently supported by water quality models, whose results are themselves affected by the lack of detailed input data. A possible solution is to use probabilistic models that consider the inherent uncertainty of the different inputs. In this research, we extended a simple water quality model (QUAL-UFMG, based on Qual2E) through Monte Carlo simulations to generate probabilistic results and applied it to a representative case study in Brazil. Results showed that, depending on the distribution of probabilities and variability of parameters adopted, the outcome of a non-deterministic modelling approach may differ significantly from a deterministic one regarding compliance with water quality standards. Moreover, the probabilistic strategy is more scientifically transparent and robust, as it explicitly communicates the uncertainty in both the measured data and modelling results. We conclude that a probabilistic approach is particularly useful in regions with a low data availability such as developing countries, as uncertainties are high due to insufficient monitoring, and the risk to human health is elevated due to a low prevalence of sanitation

Manual of Water Quality Models for Virginia Estuaries

It is not the purpose of this manual to make a nonmodeler able to develop a model by reading through it, since no manual of this nature can accomplish such a task. This manual is intended to increase the planner or manager\u27s options by acquainting him with various types of models and informing him of the availability of currently working models. This manual contains the following: 1. A scheme indicating the types of water quality models which could be constructed, i.e. an overview of choices in models. 2. A brief description of each type of models developed under the Cooperative State ~gencies program. 3. A list of empirical formulas or values for the rate constants used in the models. 4. A directory of water quality models which have been applied to Virginia estuaries

Los objetos de aprendizaje como herramienta complementaria en la docencia de modelos de calidad de aguas superficiales

[EN] Water quality models that allow us to study and manage the environmental problems caused by wastewater discharges are mathematical models formulated by means of second order partial differential equations. The complexity that involves the construction and study of these models brings about the need to introduce new teaching methodologies. In this contribution, we present several applications of virtual laboratories developed with Mathematica and we show the advantages of using learning objects as a teaching tool in the classroom, particularly if applied to the teaching of surface water quality models.[ES] Los modelos de calidad de aguas que permiten estudiar y gestionar los problemas ambientales ocasionados por vertidos de aguas residuales son modelos matemáticos basados en el planteamiento de ecuaciones diferenciales en derivadas parciales de segundo orden. La complejidad que conlleva la construcción y estudio de estos modelos hace necesario introducir nuevas metodologías docentes. En esta contribución se presentan varias aplicaciones de laboratorios virtuales desarrolladas con el programa Mathematica y se muestran las ventajas de utilizar objetos de aprendizaje como herramienta docente en el aula, en particular si se aplican en la docencia de modelos de calidad de las aguas superficiales.Alemany, E.; Asensi, EJ. (2013). Los objetos de aprendizaje como herramienta complementaria en la docencia de modelos de calidad de aguas superficiales. Modelling in Science Education and Learning. 6(2):53-65. doi:10.4995/msel.2013.1903SWORD536562E. Alemany, E. Checa. Un curso práctico de cálculo con Mathematica 8. Ed. UPV. Valencia (2012).E. J. Asensi, M. Martín. Aplicación docente de una herramienta informática en las prácticas de tratamientos biológicos de aguas residuales. I Encuentro Internacional de Ense-anza de la Ingeniería Civil. Ciudad Real (2003).R. Barat, M. Martín, E. J. Asensi. La docencia de la asignatura de calidad de aguas / Teaching in water quality course. I Encuentro Internacional de Ense-anza de la Ingeniería Civil. Ciudad Real (2003)

Watershed Based Analysis for Water Quality Management within the Escatawpa River System

Assessment of water quality within the Escatawpa River system was accomplished utilizing the Better Assessment Science Integrating Point and Nonpoint Sources (BASINS 2.0) to develop the watershed model, and the CE-QUAL-W2 software to develop the estuary model. The watershed model was utilized to quantify both hydrodynamic and water quality (fecal coliforms) characteristics of the watershed for a simulation period spanning from 1990 through 1999. Herein, calibration and application results are presented for watershed and estuary simulations made in an uncoupled manner. The models were developed such that loose coupling of watershed and estuary models can be accomplished as a subsequent phase of this ongoing project. CE-QUAL-W2 model calibration was performed utilizing a set of site specific data acquired on the Escatawpa Estuary System during an intensive survey period of September 10-15, 1997. Dissolved oxygen levels in the system were closely examined, with regards to the impacts from point source discharges