Principal Investigator

Dr. Hul Seingheng
Institute of Technology of Cambodia (ITC), Cambodia

ASEAN Co-Investigator

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Japanese Co-Investigator

Prof. Chihiro YOSHIMURA Dr. OLIVER CRISTIAN SAAVEDRA VALERIANO
Tokyo Institute of Technology

Awarded year

2015

Program

Collaborative Research Program for Alumni (CRA)

Field

Environmental Engineering

Abstract

Nutrients such as Phosphorus and Nitrogen consist of a variety of natural and synthetic substances that stimulate plant growth and enrich aquatic ecosystems. As a general rule, phosphorus tends to be the limiting nutrient in freshwater systems, and nitrogen tends to be the limiting nutrient in marine systems. This means that increased loadings of these nutrients can have significant effects on the character and condition of these respective systems. Human activities have had a profound effect on the cycling of nutrients and nutrient pollution. Nutrient availability involves inputs from natural and human sources, such as flows from rivers and streams, storm water runoff carrying fertilizers and other materials, discharges from sewage treatment plants, atmospheric deposition, and numerous other sources. The nutrients are utilized by phytoplankton and other aquatic vegetation. Increased nutrient loading can dramatically change the structure and function of freshwater and marine ecosystems by altering biogeochemical cycles and producing cascading effects throughout the ecosystem and food web, such as prolonged algae blooms, depressed oxygen levels, fish kills and losses of aquatic vegetation. Eutrophication, as these nutrient-driven changes are known, is one the most important challenges facing ecosystems (Carpenter et al., 1998). In the river and lake, the process of erosion, sediment delivery and sediment transport are an important component and measure of the functioning of Earth System. Moreover, erosion and sediment redistribution process not only play an important role in soil development but also is the primary driver of delivering the nutrients, organic matters, pathogens and pollutants by attaching with sediment into river and reservoir. These receiving water bodies are easy to trigger the algal bloom and infectious water-borne illness whenever the condition is conducive to the algae and pathogens in the water, specifically the non-point source pollution such as domestic wastes, waste water, sewer, agricultural wastes, application of synthetic fertilizers, which are attached sediment in runoff and are discharged to the river and lake within the watershed. For better understanding the nature and scope of the problems towards management prevent and control the pollution sources, not only the investigations into sources, loading, pathways, and effects of nutrient and pathogen pollution should be effectively made and studied, but also accurately predicting the short and long term fate of water quality condition such as sediment, nutrient and infectious risk of pathogens how they will change and behave in term of population and agricultural practices increase, infrastructure development, dam construction and land use change in the future. The purpose of this research is to implement scientific methodologies in order to fully represent and accurately quantify the consequences of the human impact in the Tonle Sap Lake Basin as well as to propose solutions of the problem in term a of examining the effects of realistic and low-cost mitigation measures. This aim will be reached by the following objectives: 1. To characterize the role of Suspended Sediment (SS) on nutrients, algal bloom and pathogens by conducting laboratory experiment and field survey. 2. To identify the suitability of basin scaled hydrologic model, sediment transport model and water quality dynamic model. 3. To calibrate, validate and simulate the developed model using observed data to apply in the TSL basin. 4. To develop water quality dynamic model by incorporating the characterized role of TSS with the developed sediment model to quantify and evaluate the infectious risk and pollutants in the TSL.

Project at glance

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