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Understanding Formation and Evolutio...

O'Malley, Paul W.

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Understanding Formation and Evolution of Dune Fields by Spatial Mapping and Analysis: Upper Muskegon River Valley, Michigan.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Understanding Formation and Evolution of Dune Fields by Spatial Mapping and Analysis: Upper Muskegon River Valley, Michigan./
Author:	O'Malley, Paul W.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	108 p.
Notes:	Source: Masters Abstracts International, Volume: 81-05.
Contained By:	Masters Abstracts International81-05.
Subject:	Geomorphology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27539258
ISBN:	9781687948748

Understanding Formation and Evolution of Dune Fields by Spatial Mapping and Analysis: Upper Muskegon River Valley, Michigan.
O'Malley, Paul W.

Understanding Formation and Evolution of Dune Fields by Spatial Mapping and Analysis: Upper Muskegon River Valley, Michigan. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 108 p.

Source: Masters Abstracts International, Volume: 81-05.

Thesis (M.S.)--Bowling Green State University, 2019.

This item must not be sold to any third party vendors.

The morphology of vegetation-stabilized parabolic dunes has been seen as a source of climate information from their periods of stabilization. Several dune fields in the upperMuskegon River Valley in central Michigan, including fields not previously described in the literature, were mapped using Geographic Information System (GIS) based techniques. The mapping used terrain analyses, derived from a digital elevation model (DEM) and a Light Detection and Ranging (LiDAR) based terrain model in tandem with semi-automated based extraction followed by manual refinement of delineation and visualization techniques (VT). Terrain parameters and VT also guided digitization of dune crestlines. The morphology of the mapped dunes was characterized in terms of slope and aspect relationships, and comparisons were evaluated. Directional statistics were used to describe crestline orientations and circular variance. The morphology of these dune fields likely reflects a climate having an unequal bimodal wind regime, the dominant regime being northwesterly and the secondary regime being southerly or southwesterly. Based on visual interpretations, the location of downwind, compound parabolic forms are linked to locations likely to have had shallow groundwater, or to possibly suitable locations for parkland that could have induced precipitation ridges marking downwind dune field margins. Elongated dune forms are linked to rising terrain. Exploratory data analysis (EDA), primarily based on slope and aspect correlations, revealed a strongly asymmetric distribution in slopes of the fields, indicating the potential that a bimodal wind regime was present when the dunes stabilized. Cross-cutting relationships between dunes and terraces of the Muskegon River were observed which place formation of the dunes before the formation of paleo-meanders by a forerunner to that stream. The planform and distribution of the dunes in the dune fields also appear closely tied to the changing groundwater availability.

ISBN: 9781687948748Subjects--Topical Terms:

542703
Geomorphology.

Understanding Formation and Evolution of Dune Fields by Spatial Mapping and Analysis: Upper Muskegon River Valley, Michigan.
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520 $a The morphology of vegetation-stabilized parabolic dunes has been seen as a source of climate information from their periods of stabilization. Several dune fields in the upperMuskegon River Valley in central Michigan, including fields not previously described in the literature, were mapped using Geographic Information System (GIS) based techniques. The mapping used terrain analyses, derived from a digital elevation model (DEM) and a Light Detection and Ranging (LiDAR) based terrain model in tandem with semi-automated based extraction followed by manual refinement of delineation and visualization techniques (VT). Terrain parameters and VT also guided digitization of dune crestlines. The morphology of the mapped dunes was characterized in terms of slope and aspect relationships, and comparisons were evaluated. Directional statistics were used to describe crestline orientations and circular variance. The morphology of these dune fields likely reflects a climate having an unequal bimodal wind regime, the dominant regime being northwesterly and the secondary regime being southerly or southwesterly. Based on visual interpretations, the location of downwind, compound parabolic forms are linked to locations likely to have had shallow groundwater, or to possibly suitable locations for parkland that could have induced precipitation ridges marking downwind dune field margins. Elongated dune forms are linked to rising terrain. Exploratory data analysis (EDA), primarily based on slope and aspect correlations, revealed a strongly asymmetric distribution in slopes of the fields, indicating the potential that a bimodal wind regime was present when the dunes stabilized. Cross-cutting relationships between dunes and terraces of the Muskegon River were observed which place formation of the dunes before the formation of paleo-meanders by a forerunner to that stream. The planform and distribution of the dunes in the dune fields also appear closely tied to the changing groundwater availability.
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