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<br /> <br />Figure K-l. Transpiration-induced depressions in the water <br />table commonly are filled in by recharge during the following <br />spring, but then form again to some extent by late summer <br />nearly every year. <br />Nevins Lake, a closed lake in the Upper Peninsula of <br />Michigan, illustrates yet another type of interaction of lakes <br />with ground water in glacial terrain. Water-chemistry studies <br />of Nevins Lake indicated that solutes such as calcium provide <br />an indicator of ground-water inflow to the lake. Immediately <br />following spring snowmelt, the mass of dissolved calcium in <br />the lake increased rapidly because of increased ground-water <br />inflow. Calcium then decreased steadily throughout the <br />summer and early fall as the lake received less ground-water <br />inflow (Figure K-2). This pattern varied annually depending <br />on the amount of ground-water recharge from snowmelt and <br />spring rains. The chemistry of water in the pores of the lake <br />sediments was used to determine the spatial variability in <br />the di rection of seepage on the side of the lake that had the <br />most ground-water inflow. Seepage was always out of the <br />lake at the sampling site farthest from shore and was always <br />upward into the lake at the site nearest to shore. Flow rever- <br />sals were documented at sites located at intermediate <br />distances from shore. <br /> <br />'" <br />~ 11,000 <br />" <br />o <br />"- <br />~ 9,900 <br />ui <br />'" <br />" <br />" <br />" <br />" <br />o 7,700 <br />~ <br />" <br />u <br />" <br />w <br />~ <br />" <br />'" <br />'" <br />is <br /> <br />>- <br />w <br />194,205 ~ <br />u <br />158,895 ~ <br />u <br />Z <br />123,585 -, <br />~> <br />0" <br />88.275 i C <br />~ffi <br />",,, <br />52.965 ~ <br />" <br />~ <br />17,655 0 <br />o ;s <br />-17,655 ~ <br /><.:> <br /> <br /> <br />Dissolved <br />calcium mass <br />/ <br /> <br />6.600 <br />5,500 <br />'" > >- z '" ~ >- z ~ > >- z '" > <br />"- ~ g " "- g " "- ~ u '\ "- ~ <br />" " , " " " " " " " <br /> , , , , , <br />1989 1990 1991 1992 <br /> <br />Figure K-2. A large input of ground water during spring <br />supplies the annual input of calcium to Nevins Lake in the <br />Upper Peninsula of Michigan. (Modified from Krabbenhoft, <br />D.P., and Webster, KE, 1995, Transient hydrogeological <br />controls on the chemistry of a seepage lake: Water <br />Resources Research, v. 31, no. 9, p. 2295-2305.) <br /> <br />Dune terrain also commonly contains lakes and <br />wetlands. Much of the central part of western Nebraska, <br />for example, is covered by sand dunes that have lakes and <br />wetlands in most of the lowlands between the dunes. Studies <br />of the interaction of lakes and wetlands with ground water at <br />the Crescent Lake National Wildlife Refuge indicate that most <br />of these lakes have seepage inflow from ground water and <br />seepage outllow to ground water. The chemistry of inflowing <br />ground water commonly has an effect on lake water chem- <br />istry. However, the chemistry of lake water can also affect <br />ground water in areas of seepage from lakes. In the Crescent <br />Lake area, for example, plumes of lake water were detected In <br />ground water downgradient from the lakes, as indicated by the <br />plume of dissolved organic carbon down gradient from <br />Roundup Lake and Island Lake (Figure K-3). <br /> <br /> <br />Nevins Lake, Michigan. (Photograph by <br />David Krabbenhoft.) <br /> <br />102025' <br /> <br />41Q4S' <br /> <br />~oundUP Lake <br />21 <br />. <br />O. <br /> <br />.4 Well and concentration <br />of dissolved organic <br />1 carbon, in milligrams <br />. per liter <br /> <br />o <br />. <br /> <br /> <br />o 1 MILE <br />I I <br /> <br />o <br />. <br /> <br />4 <br />. <br /> <br />Figure K-3. Seepage from lakes in the sandhills of Nebraska <br />causes plumes of dissolved organic carbon to be present <br />in ground water on the downgradient sides of the lakes. <br />(Modified from LaBaugh, J. W., 1986, Umnological character- <br />istics of selected lakes in the Nebraska sandhills, U.S.A., <br />and their relation to chemical characteristics of adjacent <br />ground water: Journal of Hydrology, v. 86, p. 279-298.) <br />(Reprinted with permission of Elsevier Science-NL, <br />Amsterdam, The Netherlands.) <br /> <br /> <br />Island Lake, Nebraska. (Photograph by Thomas Winter.) <br /> <br />49 <br />