EARTH123 Lecture 9: 2017.10.23
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17 Nov 2017
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It"s hard to k(cid:374)o(cid:449) a(cid:271)out grou(cid:374)d(cid:449)ater (cid:271)/(cid:272) (cid:272)a(cid:374)(cid:374)ot see. Precipitation is a big input of hydrological cycle. When it comes to water, everything we do is harmful. Types of aquifers: unconfined aquifer (watertable aquifer, confined aquifer (ideal) layer inside of the earth the kind that we can drink. Safer. it is u(cid:374)der (cid:862)artesia(cid:374) (cid:272)o(cid:374)ditio(cid:374)(cid:863) (cid:862)artesia(cid:374) (cid:449)ell(cid:863: semi-confined aquifer (leaky aquifer) Once the aquifer is contaminated, there is nothing much we can do. All we can do is stop the source, and let the nature heal itself. Typical aquifers: glacial outwash sands and gravels, kames & moraines (k-w region and oak ridges, eskers (k-w region, deltas and outwash fans, carbonate sedimentary rock, fractured limestone (winnipeg/ cambridge, karstic limestone (florida) Water contamination can actually cover large areas. (cid:862)verti(cid:272)al flo(cid:449)(cid:863) (cid:862)per(cid:272)hed (cid:449)ater ta(cid:271)le(cid:863) Clay layer does(cid:374)"t allo(cid:449) (cid:449)ater (cid:373)o(cid:448)e(cid:373)e(cid:374)t (cid:448)ery easily. (cid:862)lateral/horizontal flo(cid:449)(cid:863: cross-section. Flow from edge of diagram to lower/stream: plan view potentiometric map.