. Bulletin. Natural history; Natural history. 30 Illinois Natural History Survey Bulletin Vol. 32, Art. 1 Fig. 9 shows the sedimentation rates in seven lakes above Peoria. These lakes are lateral to the river channel, except Upper Peoria Lake, through which the river flows. The linear re- gressions show a high correlation be- tween the depth of the water and the rate of sedimentation. Sedimentation increases as tiie water deej>ens because of the greater standing column of wa- ter from which sediments precipitate. The exceptionally high correlation co- efficients (r) confirm this relationshi
. Bulletin. Natural history; Natural history. 30 Illinois Natural History Survey Bulletin Vol. 32, Art. 1 Fig. 9 shows the sedimentation rates in seven lakes above Peoria. These lakes are lateral to the river channel, except Upper Peoria Lake, through which the river flows. The linear re- gressions show a high correlation be- tween the depth of the water and the rate of sedimentation. Sedimentation increases as tiie water deej>ens because of the greater standing column of wa- ter from which sediments precipitate. The exceptionally high correlation co- efficients (r) confirm this relationship. Upper Peoria Lake has a lower sed- imentation rate than the other lakes because the river transports more sed- iment through it than through lateral lakes. At m (7 ft), the yearly rate of sedimentation is m ( ft) as compared with m ( ft) in the other lakes. The lateral lakes are inundated during floods. Re- duced current velocity in these lakes allows more sediment to precipitate than can drop out at the higher ve- n2 locities present in LTpper Peoria Lake. There is amazingly little difference among the sedimentation rates in lat- eral lakes above Peoria. Fig. 9 indi- cates that at a water depth of m (1 ft) in Upper Peoria Lake wave and ice action have an erosive effect on the shallow margins of the lake bed and transport bed material to other areas. The same action has affected the shore margins of some of the lateral lakes. Below Peoria, sedimentation studies were made at Rice Lake, Lake Chau- tauqua, Anderson Lake, and Meredosia Bay (Fig. 10). These lakes have lower and more diverse sedimentation rates than the upper lakes. The differences in sedimentation rates among lakes can be accounted for by their relative isolation from the river. The lakes above Peoria have only low, narrow peninsulas of land separating them from the river at lev- els below flood stage. All of the lat- eral lakes studied above Peoria have = SENACHWINE, R n
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