Water Enviorment Evaluation And The System Construction Study Of Evaluation System On The Basis Of GIS,ANN

Nansihu　lake　lies　in　intersection　of　the　southwest　of　Shandong　and　Jiangsu,　is　one　of　ten　major　fresh　water　lakes　of　our　country.　There　are　53　rivers　in　the　whole　drainage　basin,　among　them　there　are　dozen　main　rivers.　Nansihu　lake　is　the　important　sources　of　water　of　Shandong.　With　the　high-speed　development　of　economic　construction　and　the　constant　increase　of　water　resource　demand,　water　resource　of　the　drainage　basin　has　already　become　the　important　factor　to　influence　regional　sustainable　development.　At　present,　many　environmental　problems　produce　or　hide　in　development　of　coal　resources　and　utilization　of　water　resources,　such　as　the　continuous　drop　of　the　water　table　because　of　the　shortage　of　water　resource,　surface　subsidence,　water　pollution.　The　pollution　of　Nansihu　lake　is　outstanding,　especially　in　the　lake　mouth　of　Laoyunhe　river　and　Chenghe　river.　The　bottom　dwelling　animals　have　already　disappeared,　water　plant　die　all.　All　these　states　produce　the　great　influence　of　restricting　energy　base　construction　and　sustainable　development　of　the　regional　economy.　So　it　is　urgent　to　carry　on　rational,　effective　water　environment　comprehensive　evaluation　to　control　and　manage　the　decisions.　　This　study　is　a　key　tache　of　the　subject　"The　decision-making　supported　system　construction　of　water　resource　management　of　Jining,　Shandong"　which　cooperated　with　White　Russia.　I　adopt　LMBP　neural　network　arithmetic　to　construct　water　environmental　evaluation　system　of　Nansihu　drainage　basin,　carry　on　overall　evaluation　to　water　environment　and　compare　with　computational　analysis.　On　the　basis　of　what　forefathers'　studies,　use　RS　and　GIS　to　construct　the　integrated　evaluation　system,　through　spacial　expression　ability　of　GIS,　make　overall　situation　of　water　quality　and　variation　tendency　more　clear　to　the　administration.　For　different　years　and　monitoring　sections,　through　the　menu,　can　easily　obtain　monitor　water　quality　value　from　backstage　supported　database,　calculate　the　evaluation　value　through　model　in　the　storehouse　automatically,　then　come　out　to　show　directly　at　electronic　map.　That　realizes　the　integration　of　many　functions:　evaluation　work　of　water　quality,　spacial　analysis,　automatic　calculation,　etc,　greatly　improves　working　efficiency　of　water　quality　evaluation,　facilitates　the　assistant　decision　to　the　departments,　consequently　greatly　make　water　resources　and　water　environmental　management　reach　a　higher　level.The　main　research　contents,　method　and　conclusion　of　this　article　are　as　follows:　1.　This　article　offers　theory　foundation　of　water　quality　evaluation　system　to　whole　drainage　basin　on　the　basis　of　the　studies　of　forefather,　according　to　pollution　condition　of　drainage　basin　to　analyze　and　evaluation　water　quality　and　evaluation　model.　2.　Explain　various　kinds　of　methods　of　water　quality　evaluation　and　mathematics　model　adopted　at　present,　and　compare　these　models,　defining　their　merits　and　shortcomings.　Especially　the　basic　principles,　merits　and　shortcomings,　improving　thought　　of　BP　and　LMBP.　On　the　basis　of　analyzing　the　basic　principles　and　application　in　water　quality　evaluation　of　"BP　and　improved　LMBP　model",　construct　system　model,　study　and　train　model　by　utilizing　national　water　quality　standard,　adjust　connected　weight　and　correct　the　error　to　reach　the　number　value.　Then　utilize　the　sample　storehouse　generator　to　construct　evaluation　sample　storehouse,　rationally　evaluation　to　water　quality　monitor　section,　and　comparatively　analyze　the　results,　evaluation　spacial　water　quality.　In　the　end,　compare,　analyze　and　summary.　Lastly,　utilize　controlling　part　VB+MAPX　to　develop　whole　appraisal　system,　merged　closely　the　spacial　analysis　function　and　water　quality　evaluation,　carry　on　ocular　effective　spacial　analysis　and　function　evaluation　of　water...