Hydraulic relationships between shallow groundwater sub-systems discharging to surface water bodies and underlying regional systems.
Item
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Title
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Hydraulic relationships between shallow groundwater sub-systems discharging to surface water bodies and underlying regional systems.
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Identifier
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AAI9405561
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identifier
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9405561
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Creator
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Modica, Edward.
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Contributor
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Adviser: O. L. Franke
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Date
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1993
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Language
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English
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Publisher
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City University of New York.
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Subject
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Hydrology | Geology
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Abstract
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Hypothetical flow models and a flow simulation of the Upper Rancocas watershed system in New Jersey were used to characterize the boundary zone separating stream sub-system flow and regional flow, and to determine the flow patterns within stream sub-systems. Estimates of flow in three-dimensional aquifer systems consisting of regional and stream sub-system flow regimes were made with numerical flow solutions and particle tracking analysis. Hydraulic parameters that affect stream system flow patterns were systematically modified in order to evaluate cause-and-effect relations and to determine the degree to which parameters can influence flow in the system. Stream sub-system geometry and its flow patterns are largely controlled by the quantity and distribution of stream discharge. The relative amount and location of discharge along a stream channel is in turn affected by variations in anisotropy, aquifer thickness, recharge rates, streambed elevation, and drainage density. The "bounding surface" is an interaction zone between the stream sub-system and the adjacent flow system, the form of which is sensitive to system boundaries and hydraulic properties of the aquifer and stream sub-system. Regional flow is restricted in thin aquifer systems. Stream source areas in thin aquifers tend to be more extensive. Thin systems limit the development of flow to remote or major regional sinks that serve as common discharge outlets for the system. Thick aquifers allow for development of deeper flow systems under local stream sub-systems. Streams are line-sinks that induce complex flow patterns in a flow field whereby flow from near and far source areas are drawn into common discharge zones. The age range of groundwater that discharges along the stream varies as a function of distance downstream from the start-of-flow. The highest age ranges occur near the stream terminus.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
