| With the decay of the groundwater resources day by day,concentrating on water resource in the earth's surface in the urban water supply system——the dependence of water of the reservoir is stronger and stronger.Reservoirs'role changes fundamentally too,that is,to be the main urban water source supplier presently instead of field irrigation function and reduce natural disasters to prevent flood in past.Therefore,the state of water quality and water quantity in the reservoir has determined the vitality of city development directly.At present,Reservoir faces water little,water dirty,water muddy mostly in utilizing.Water little means the few water resource amount suitable for utilizing reduces gradually in the reservoir;Water dirty means the aggravation of point source pollution and nonpoint source pollution in reservoir district,in which nonpoint source pollution is the core.Water muddy mainly refers to the wholly silt question.The questions aboved have directly caused the further reduction of usable water resource quantity,conduced the water shortage of the industrial production of the city and the living of people day by day,influenced the quality of daily production and quality seriously and concerned lives and properties and environmental security of people directly too.With the problems aboved, This Paper which relied on the county used the main source of drinking water this way - Boshan reservoir in Queshan for the study, select the " Boshan reservoir drinking water source protection of water quality trends and countermeasures, " a study entitled.Through the reservoir (2000 -2009) of data analysis and evaluation of water quality, water quality analysis of spatial and temporal variations and changes in the causes of water pollution control scenarios on reservoir analysis and proposed protection measures for the protection of drinking water sources in a targeted manner To further improve water quality, optimize water management to provide a scientific basis.The main research contents are as follows:(1)from the natural geography and climate characteristics and socio-economic aspects of the study area and the reservoir to clarify the background; collection reservoir (2000 - 2009) water quality data rich,flat, dry season water quality experimental data, the single factor evaluation, Comprehensive pollution standard index and index of abundance, flat, dry season water quality monitoring results of Assessment, to identify major pollutants, integrated assessment of water given conclusion.(2) water quality assessment, based on the scores and eutrophication based on nutritional standards, the degree of eutrophication of reservoirs.(3) of total nitrogen, total phosphorus levels of major pollutants such, dry, wet spatial and temporal variation of characteristics of pollutants between the links; analysis of changes in water quality cause.(4) Boshan reservoir scenario analysis for water pollution control studies, based on water quality status quo (zero control), each year the best water quality (optimal control), each of the worst water quality (the worst control) set of three scenarios, the use of Grey GM (1,1) forecasting model of total phosphorus, total nitrogen and other major water pollutants in one-dimensional time series forecasting model, by verifying the accuracy of the model and residual correction, analysis of different scenarios, total phosphorus, total nitrogen and other major pollutants in Concentration of future changes.(5) According to the assessment of water quality in the reservoir eutrophication research and scenario analysis, from the outside source (point source and non-point sources), endogenous (engineering, chemistry and biology, etc.) and water source protection measures and other aspects of water quality Protection measures.Main study results as follows:(1) Between 2000 -2009, Boshan reservoir of chemical oxygen demand, fluoride, hexavalent chromium, pH, total phosphorus are single-factor pollution index exceeded the 2002 single-factor pollution index of total nitrogen appear excessive, exceeding the maximum rate of 102%;The normal water year, dry season water quality are good, wet period in 2002 is light pollution, the other belonging to each section during the purity;Apart from Boshan reservoir wet period occurred in 2002 - eutrophication, and other sections of the water quality is poor time - in the nutrition and the nutrition of. (2) Changes in water quality during Boshan reservoir, the interannual variation and spatial variation of water quality show that: water is wet season and dry seasons the water level difference; libraries heart water is the first library, Tail good.(3) 2009 River Boshan Reservoir watershed sewage COD, TN, TP of the Town of equivalent standard emissions contributed most of Zhugao, Shigunhe town at least roll; The main pollutants in domestic sewage pollution contribution to the highest rate of TP, COD's Contributions to the lowest; Boshan Reservoir in 2009 the township contribution of human waste contamination or less; major pollutants in the contribution rate to the highest TP pollution, mainly phosphorus pollutants; 2009 animal feces and urine reservoir of pollutants in the town Wagang largest contribution, minimum contribution of Shigunhe town; all kinds of animal manure in the cow the greatest contribution to the COD, TN and TP cow urine on the greatest contribution.(4) In this paper, Grey GM (1, l) on the Boshan reservoir forecasting model scenario analysis of pollution control, the establishment of COD, total phosphorus, phosphorus, total nitrogen of the one-dimensional time water quality forecasting model, and the difference method with a posteriori validation of the model Accuracy, better prediction of the COD, total phosphorus, total nitrogen concentration, has a certain value ;The results from the scenario point of view: in addition to best control scenario, zero control,and the worst scenario the next three years the control COD, total phosphorus, total nitrogen concentrations were not exceeded forecasts. |
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