scholarly journals Geohydrology, water quality, and conceptual model of the hydrologic system Saco Landfill area, Saco, Maine

1995 ◽  
Keyword(s):  
Water Quality ◽  
Conceptual Model ◽  
Hydrologic System

On the effect of scaling conceptual model complexity on stochastic response for water quality modeling

2011 ◽  
Vol 63 (2) ◽  
pp. 360-366
Author(s):  
G. T. Parker
Keyword(s):  
Water Quality ◽  
Conceptual Model ◽  
Water Quality Modeling ◽  
Response Surfaces ◽  
Model Complexity ◽  
Quality Model ◽  
Real World Data ◽  
Quality Models ◽  
Modelling Framework ◽  
Water Quality Models

This paper extends previous work comparing the response of water quality models under uncertainty. A new model, the River Water Quality Model no. 1 (RWQM1), is compared to the previous work of two commonly used water quality models. Additionally, the effect of conceptual model scaling within a single modelling framework, as allowed by RWQM1, is explored under uncertainty. Model predictions are examined using against real-world data for the Potomac River with a Generalized Likelihood Uncertainty Estimation used to assess model response surfaces to uncertainty. Generally, it was found that there are tangible model characteristics that are closely tied to model complexity and thresholds for these characteristics were discussed. The novel work has yielded an illustrative example but also a conceptually scaleable water quality modelling tool, alongside defined metrics to assess when scaling is required under uncertainty. The resulting framework holds substantial, unique, promise for a new generation of modelling tools that are capable of addressing classically intractable problems.

scholarly journals Hydrologic Study of Jewel and Wind Caves

1986 ◽  
Vol 10 ◽  
pp. 177-182
Author(s):  
E. Alexander, Jr.
Keyword(s):  
Water Quality ◽  
Human Impact ◽  
Water Use ◽  
Water Distribution ◽  
Cave Environment ◽  
Hydrologic System

The research underway has the following objectives: 1. To evaluate the water distribution within these two park areas; 2. To determine the effects of human impact upon the natural hydrologic system; 3. To document any detrimental effects to the water quality; 4. To document any instances in which the cave environment is adversely affected by the quality or quantity of the water present; and 5. To provide options to present water use practives, if necessary.

Verification of a conceptual model of water quality for small temporarily open/closed estuaries: East Kleinemonde Estuary, South Africa

2009 ◽  
Vol 60 (3) ◽  
pp. 234 ◽  
Author(s):  
Susan Taljaard ◽  
Gavin Snow ◽  
Phumelele Gama ◽  
Lara van Niekerk
Keyword(s):  
South Africa ◽  
Water Quality ◽  
Conceptual Model ◽  
Complex Dynamics ◽  
Inorganic Nitrogen ◽  
Spatial Scales ◽  
Chemical Parameters ◽  
Physico Chemical ◽  
Temporal And Spatial ◽  
Warm Temperate

The dynamics of the world’s larger permanently open estuaries have been well documented, but much less is known about the complex dynamics of smaller temporarily open/closed estuaries (TOCEs). Seventy per cent of South Africa’s 250 estuaries are classified as TOCEs, and many are less than 50 ha. A conceptual model of the water-quality dynamics of TOCEs has been proposed, primarily considering three hydrodynamic states (closed, semi-closed and open). This paper uses data from the East Kleinemonde Estuary, a small TOCE in the warm-temperate region of South Africa, to verify the model, focusing on physico-chemical parameters (salinity, temperature, pH, dissolved oxygen and turbidity) and inorganic macronutrients (dissolved inorganic nitrogen and dissolved inorganic phosphate) for the open and closed states. The results generally fitted the model in terms of the behaviour of the physico-chemical parameters and macronutrients in the water column. This knowledge provides a first approach to predict the water-quality dynamics in small TOCEs, thereby ensuring that the often limited resources are targeted at resolving uncertainties at appropriate temporal and spatial scales. TOCEs are not unique to South Africa and also occur along other coasts (Mediterranean and south-western Australia) where this type of model could also be applied.

An objective test of stochastic behavior in riverine water quality models

2009 ◽  
Vol 59 (1) ◽  
pp. 159-165 ◽  
Author(s):  
G. T. Parker ◽  
R. L. Droste ◽  
C. D. Rennie
Keyword(s):  
Water Quality ◽  
Conceptual Model ◽  
Primary Source ◽  
Response Surfaces ◽  
River Network ◽  
Calibration Data ◽  
Potomac River ◽  
Quality Models ◽  
Eastern Usa ◽  
Water Quality Models

Predictions of river water quality models are subject to substantial uncertainties, which depend not only on parameterization and calibration strategies but also on the structure of the conceptual model itself. To evaluate the importance of this effect and associated implications for stochastic models, investigations were conducted based on a segment of the Potomac River in the eastern USA. Two commonly used conceptual representations of real-world processes were used, and their simulation of DO, BOD and NH4 components scrutinized. A GLUE approach to the inverse problem was then used to examine how uncertainty changed along the river network for each conceptual model. Differences were observed not only between deterministic instances of each conceptual model, but also between their response surfaces as a whole. Uncertainties within the river network are substantially influenced by the selection of calibration data used, as well as the primary source of the constituent examined. The suggested methodology can be used to test conceptual model validity for specific applications. The results of this study will help users select and assess models for varied problems, and refine appropriate data collection and monitoring schemes.

scholarly journals Hydrologic Study of Jewel Cave/Wind Cave

1987 ◽  
Vol 11 ◽  
pp. 133-140
Author(s):  
E. Alexander, Jr. ◽  
Marsha Davis
Keyword(s):  
Water Quality ◽  
Human Impact ◽  
Water Use ◽  
Water Distribution ◽  
Cave Environment ◽  
Hydrologic System ◽  
Water Use Practices

The hydrologic study at Wind and Jewel Caves has the following Objectives: 1) to evaluate the water distribution within these two park areas; 2) to determine the effects of human impact upon the natural hydrologic system; 3) to document any detrimental effects to the water quality; 4) to document any instances in which the cave environment is adversely affected by the quality or quantity of the water present; and 5) to suggest options to change present water use practices, if necessary.

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