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This dissertation, Integrated River Management of the East River: Field Studies, Hydrologic and Water Quality Modelling by Wai, Thoe, 陶煒, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled \Integrated River Management of the East River - Field Studies, Hydrologic and Water Quality Modelling Submitted by Thoe Wai for the degree of Master of Philosophy at The University of Hong Kong in March 2007 The East River Basin is one of the most important water basins in south-east China. Since the basin is currently undergoing rapid development, problems such as water pollution and water over-utilization have inevitably arisen. This study attempts to address the sustainability of the East River water in an integrated manner - by eld studies, hydrological and water quality modelling. Field studies are conducted to investigate the water quality, algal and benthic macro- invertebrate bio-diversity along the East River. It is found that the upper and middle reaches of the East River are relatively unpolluted. The water quality deteriorates towards the river mouth and fails to meet the drinking water quality standard in some tributaries. Bio-diversity is good in the upper and middle reaches of the basin, but decreases downstream. Two models, the physically-based distributed hydrological model, MIKE-SHE, and the empirically-based lumped parameter watershed model, HSPF, are used in this study. ThesemodelsarerstappliedtotheHoChungcatchmentinHongKong, toinvestigate bothstormwaterpollutionandlongtermwaterquality. Predictedstreamowforboth modelsareinexcellentagreementwithdata. Thepredictedmonthly-averagedpollutant concentrations by HSPF are supported by the observations. Thedaily-averagedstreamowoftheEastRiverBasinissimulatedbyboththeMIKE- SHEmodelandtheHSPFmodelfor1969-1978. Thepredicteddaily-averagedstream- ow at the mainstream stations are in good agreement with data. With an averaged streamow (at Qiaotou) of 760 m /s, the East River is able to satisfy the current total water demand (138 m /s). However in some dry months, the streamow can be as low as 117 m /s, and water supply may become a problem. HSPF is used to simulate the water quality along the mainstream of the East River (Heyuan to Qiaotou) from 1985 to 2006. It is found that the water quality of the East River has deteriorated in recent years, and that the major pollution source is Dongguan. The pollutant concentration is relatively low and constant from Heyuan to Huizhou, but increases signicantly after the conuence with the tributary from Dongguan. Based on the water quality model, a minimum streamow of 267 m /s is required to achieve the Chinese National drinking water quality standard. By considering the needs of the East River for waste assimilation, water supply, navi- gation, prevention of seawater intrusion, and ecology preservation, it is estimated that the required minimum ow for water sustainability is 417 m /s. DOI: 10.5353/th_b3899757 Subjects: Hydrologic models - China - Dong River (Guangdong Sheng)Water quality - China - Dong River (Guangdong Sheng) - Mathematical models

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