. Bulletin. Natural history; Natural history. y-int. slope i" 1903-1956 ' 1957-1978 : 1,0 DEPTH OF WATER IN METERS Pig 11.—^The linear relationship between the yearly rate of sedimentation and the depth of water in Upper Peoria Lake in each of two time periods, 1903-1965 and 1966-1976. = 1926 - 1950, R^ = , r = < = 1951 - 1976, R^ = , r = - u_^ +2,0 - O CXI I— UJ , r §a + i + -. -I—*—I—I 0,5 DEPTH IN METERS Pig 12.—The linear relationship between the yearly rate of sedimentation an
. Bulletin. Natural history; Natural history. y-int. slope i" 1903-1956 ' 1957-1978 : 1,0 DEPTH OF WATER IN METERS Pig 11.—^The linear relationship between the yearly rate of sedimentation and the depth of water in Upper Peoria Lake in each of two time periods, 1903-1965 and 1966-1976. = 1926 - 1950, R^ = , r = < = 1951 - 1976, R^ = , r = - u_^ +2,0 - O CXI I— UJ , r §a + i + -. -I—*—I—I 0,5 DEPTH IN METERS Pig 12.—The linear relationship between the yearly rate of sedimentation and the depth of water in Lake Chautauqua in each of two time periods, 1926-1950 and 1951-1976. presented a diversity of elevations (Fig. 14 and 15). By the mid-1970's the bot- tom profiles had flattened into platter- shaped basins because of the greater deposition of sediment in the deeper waters. Because sedimentation is dy- namic, the amount of silt deposited 0 DEPTH OF WATER IN METERS Fig 13.—^The linear relationship between the yearly rate of sedimentation and the depth of water in Meredosia Bay in each of two time periods, 1903-1956 and 1957-1978. in a backwater lake changes as lake depths change. Other factors (such as the sediment load carried by the nver) being equal, the total amount of sed- iment deposited per year in backwater lakes lessens as the lakes becotne shal- lower. Inasmuch as lake beds have different elevations, resulting in differ- ent degrees and time spans of inunda- tions, sedimentation rates differ from lake to lake at comparable depths. Table 13 shows the total amount of sediment deposited in 11 bottomland lakes during this century. The lakes that were originally deepest have re- ceived the greatest amounts of sed- iment. The total fill is staggering, leaving most bottomland lakes with shallow basins that are rapidly being filled as sediments "rain down'" from the waters above. Because of us depth. Upper
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
