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1、地下水和地表水的比较ComparisionofgroundwaterandsurfacewaterGroundwater：㈠Definition:Itreferstothe burialand movementindifferentdepth belowthesurfaceofthesoilandrockgapinthewater,thenarrowsenseofthegroundwateristheunderground 1000mrangeofwater.㈡Features:①Flowslowly.②Waterqualityparameterschang
2、eslowly.③Oncethepollution,itisdifficulttorestore.④Differencesinburialdepth,thetemperaturevariationofdifferent.⑤Waterqualitystatusafterremovingeasytochange.⑥Littleinfluencefromtheoutsideword.⑦Locatedbelowthewaterresistinglayer,whichbelongstothestaticwater.⑧Cycleupdatecycleislong.㈢Av
3、ailability:①Wellsandspringsarethemostwaterweusedaily.②Developmentandutilizationofgroundwater,asresidentslivingwater,industrialwaterandirrigationwatersources.③Howevergroundwatercanalsocausesomeharm,suchastoomuchwater,willcausethe railway, highway collapse, floodedminetunnel, theform
4、ationofswampsandso.④Groundwatercannotbeblindandoverexploitation,otherwise easytoformthe problemof undergroundcavity, groundsubsidenceandsoon.Surfacewater：㈠Definition:Itispresentinthe earth'ssurface isexposedtotheatmosphere, water, river, lake, glacier isthefloorboard, marsh fourkin
5、dsofwater.㈡Features:①Inadditiontotheseasaltcontentisextremelyhigh.Othersurfacewaterwithlowsalinitylevel.②Comparedwithgroundwater,thelowerhardness.③Contentofpollutantsinsurfacewaterisveryhigh.④Fromoutsideinfluence.⑤Suspendedsolidsandhighturbidity.⑥Inthewaterresistinglayerabove,belon
6、gstothedynamicwater.⑦Cycleshortupdatecycle.㈢Availability:①Itisoneoftheimportantsourcesofhuman lifeinthewater, butalsothemajorcomponent ofwaterresource countries.②Surfacewaterstoragesurfacerunoff.③Usewaterstoragefunctionofaquifer,storagewaterperiodofexcesssurfacewater,lowwaterperiod
7、foruse.④Fromtheseanear,moreabundantsurfacewater.
