Comprehensive Study And Fuzzy Evaluation To The Water Quality Characters In The Mining Subsidence Pool

Mining excavating area is a co-ecosystem of nature and society,the character of water quality in the mining subsidence area is the concentrating reflection of the regional environmental quality,in order to discuss the difference of the characteristic of the water body in the pool,find out the its special between current system and others,exploit the subsidence pool,make the ecological environment and resource lasting development,and the reference could be given for the local government.In this paper,the Xie-er excavating pond has been inspected and studied during the year 2004.4 to 2006.3,especially,the change of the time-space and its relationship of the physico-chemical factors,nutritional salt and tiny organism induce havebeen analyzed,in the meantime,the state of the water quality has been studied comprehensively.Using field survey,testing analysis and comparing study,combining with Margelef Multiple Index,Trophic Status of Comprehensive Index,Fuzzy theory to set up model to research on the water quality,the influencing factors of the eutrophic has been found out,and the inherent law has been discussed,and the state of the water quality has been evaluated and analyzed.The conclusions were summarized as follow:the indicatrix of COD,BOD5 in the water body in Xie-er subsidence pool have been on and even on the above.the true upâ…£according to the <>,and shows that it is contaminated by the reductive matter and the care need to be given,the nutritional concentration of pollutant of TN,TP etc.has. been exceeded the standard more,shows that it is influenced by the agriculture area pollution seriously.The analysis of trophic level shows that the nutritive level is getting mid-nutrition to eutrophic state,the evaluation by microbiology shows that the water quality has been backdroped caused by the environmental factors most and is getting worse and worse.the comprehensive research on the water quality shows that the value of the induce of TN,TP in Xie-er pond is the main factorswhich determined the grade of the water quality,and the main pollution of the water body is organic. contaminant,the grade of water quality is mid-eutrophic state(â…£)totally.