Using data from 1387 lakes collected over three decades, we found a wide range in the concentrations of total phosphorus (TP), total nitrogen (TN) and chlorophyll in Florida lakes, and that edaphic factors as outlined by the USEPA’s Florida Lake Regions were the dominant factor in determining the concentrations of plant nutrients in the state’s lakes. The hypothesis that all eutrophic lakes in ...

Plume rise is the height smoke plumes can reach. This information is needed by air quality models such as the Community Multiscale Air Quality (CMAQ) model to simulate physical and chemical processes of point-source fire emissions. This study seeks to understand the importance of plume rise to CMAQ air quality simulation of prescribed burning to plume rise. CMAQ simulations are compared between...

Non-point source (NPS) pollution contributes greatly to the contamination of surface water quality and has aroused widespread concerns. NPS pollution is influenced by a multitude of site-related factors whose effects are complicated. We estimated NPS pollution with a soil and water assessment tool (SWAT) model in China’s Fan River watershed. A new method, boosted regression tree (BRT), was prop...

This paper describes an integral system to model nonpoint source pollution in surface waters. Diffuse pollution models were included in a Spatial Decision Support System (SDSS) with a unique platform, common interfaces and Geographic Information System (GIS) capabilities. This consists of preand postprocessing tools, model control and sensitivity analysis for the parameters in the models. Parti...

Recently, many publications have explored the utility of Geographic Information Systems (GIS) and remote-sensed imagery to approximate the regional causes of water pollution (Basnyat 1999; Basnyat 2000; Griffith 2002). In such studies, water pollution data is placed in a geographic context to see what generalizations can be made about the impact of regional land use practices on water quality. ...

One motivation for our study concerns an environmental application that regards the identification of pollution sources in surface water: in a river, for example, the introduction of organic matter which could have as origin city sewages, industrial wastes,... usually drops to too low the level of the dissolved oxygen in the water. Since the lack of dissolved oxygen represents a serious threat ...

Successful implementation of water-quality management requires accurate scientific knowledge of water systems and sound judgment about environmental policy. This dual requirement calls for interactions between water scientists, managers, and policy experts who can jointly interpret and synthesize the data necessary for decision-making. With regard to non-point source (NPS) pollution in the Unit...

When rainfall spatially varies, complete rainfall data for each region with different rainfall characteristics are very important. Numerous interpolation methods have been developed for estimating unknown spatial characteristics. However, no interpolation method is suitable for all circumstances. In this study, several methods, including the arithmetic average method, the Thiessen Polygons meth...

The Chesapeake Bay is North America's largest and most biologically diverse estuary. It has provided a rich bounty of crabs, shellfish, and fish, and high quality recreational opportunities. However, the Bay living systems have been increasingly stressed over time by the pressures of growing populations—there are over 20 million people in the 166,534 km 2 mile watershed—industrial pollution, at...

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