简介：Thispaperusingfinitedifferenceschemeforthenumericalsolutionofadvection-dispersionequationdevelopsaone-dimensionalwaterqualitymodel.ThemodelalgorithmhassomemodificationoverothersteadystatemodelsincludingQUAL2E,whichhavebeenusedsteadystateimplementationofimplicitbackward-differencenumericalscheme.Thecomputerprograminthedevelopedmodelcontainsaspecialunsteadystateimplementationoffourpointimplicitupwindnumericalschemesusingdoublesweepmethod.Thesuperiorityofthismethodinthemodelingprocedureresultsthesimulationefficacyundersimplifiedconditionsofeffluentdischargefrompointandnon-pointsources.Themodelishelpfulforeyeviewassessmentofdegreeofinteractionbetweenmodelvariablesforstrategicplanningpurposes.ThemodelhasbeenappliedforthewaterqualitysimulationoftheHanjiangRiverbasinusingflowcomputationmodel.Modelsimulationresultshaveshownthepollutantsprediction,dispersionandimpactontheexistingwaterquality.Modeltestshowsthemodelvaliditycomparingwithothersophisticatedmodels.Sensitivityanalysiswasperformedtooverviewthemostsensitiveparametersfollowedbycalibrationandverificationprocess.

简介：学习特殊为对器官、无机的污染的评价提供一条基线，在Pyeongchang河的表面沉积的重金属污染，南朝鲜。对学习区域的评价用完了尊重到金属污染负担，生态的风险和geoaccumulated风险。在使用的索引之上基于，一个优先级索引(Pindex)被用来评价最大的污染地点。尽管在所有沉积的水银的集中在指南下面，重要充实的污染被所有应用索引观察。是期望，污染负担索引(PLI)的价值，生态的风险索引(RI)和表明的geoaccumulation风险索引(Igeo)在在上游的区域降低重金属污染与相比下游。无可否认地，沉积对未受污染根据PLI稍微弄脏当到极其高生态的风险的高度在几件沉积样品被观察时。而且，所有样品作为每Igeo没有被污染。在Igeo的简化以后，Pindex证明最大可能与2.537的价值污染了沉积。尤其是，保护的措施应该被带去被Pindex优先考虑的高度污染的区域。无可否认地，全部的器官的碳的最大的集中，全部的氮，无机的氮，全部磷，无机磷，钙，镁，钠和钾显著地作为7.8椠?被观察?潣摬猠敷？