| Summary: | 碩士 === 國立臺北科技大學 === 土木工程系土木與防災碩士班 === 106 === More and more attention has been paid to the issue of water resources pollution in recent years.Such as ecosystem destruction and drinking water pollution caused by eutrophication of rivers and reservoir.Water pollution can be divided into point source pollution and non-point source pollution.The difference is the point source pollution has any single identifiable source of pollution from which pollutants are discharged into the river.Such as domestic sewage and industrial wastewater.And the non-point source pollution occurs as a result of runoff when rain moves over and through the ground.
This study sample point source pollution and non-point source pollution as subjects in Shimen Reservoir watershed.Investigate the water quality of different land-use areas such as Dahan River, Sanmin River, peach farmland, settlements.Testing the contaminant concentration of water quality parameters such as suspended solids, ammonia nitrogen, biochemical oxygen demand, chemical oxygen demand, total phosphorus, etc.And analysis with sampling timing, accumulated rainfall, land use, etc.Further understand the contamination characteristics, the implications of water quality parameters, and the correlation of sampling conditions of each sampling point.
Research found that non-point source pollution is the main factor affecting the surface water quality.And will increase the pollution concentration as the accumulated rainfall increases.Especially in terms of biochemical oxygen demand and nutrients that more than point source pollution.The concentration of Dahan Rivers suspended solid even reached to 1300mg/L when the accumulated rainfall reached 27mm.Ammonia can be diluted in rainy day so it is not easy to sampling its peak concentration.
Vendors nearby Baiji Tunnel and Settlements that have not household connection-pipes have adverse effects on water quality.The concentration of restaurants suspended solid and BOD have obvious effect in the outflow.The quality of effluent produced in residences will change significantly with daily life.Fertilizers on farms cause high levels of nutrients in non-point source pollution.And due to the bare open space and topographical factors, the soil is easily washed away.
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