Umi-Umd-5011.Pdf (13.45Mb)
Total Page:16
File Type:pdf, Size:1020Kb
ABSTRACT Title of Document: PEDOGENESIS, INVENTORY, AND UTILIZATION OF SUBAQUEOUS SOILS IN CHINCOTEAGUE BAY, MARYLAND Danielle Marie Balduff, Ph.D., 2007 Directed By: Professor Martin C. Rabenhorst, Department of Environmental Science and Technology Chincoteague Bay is the largest (19,000 ha) of Maryland’s inland coastal bays bounded by Assateague Island to the east and the Maryland mainland to the west. It is connected to the Atlantic Ocean by the Ocean City inlet to the north and the Chincoteague inlet to the south. Water depth ranges mostly from 1.0 to 2.5 meters mean sea level (MSL). The objectives of this study were to identify the subaqueous landforms, evaluate the suitability of existing subaqueous soil-landscape models, develop a soils map, and demonstrate the usefulness of subaqueous soils information. Bathymetric data collected by the Maryland Geological Survey in 2003 were used to generate a digital elevation model (DEM) of Chincoteague Bay. The DEM was used, in conjunction with false color infrared photography to identify subaqueous landforms based on water depth, slope, landscape shape, depositional environment, and geographical setting (proximity to other landforms). The eight such landforms identified were barrier cove, lagoon bottom, mainland cove, paleo-flood tidal delta, shoal, storm-surge washover fan flat, storm-surge washover fan slope, and submerged headland. Previously established soil-landscape models were evaluated and utilized to create a soils map of the area. Soil profile descriptions were collected at 163 locations throughout Chincoteague Bay. Pedons representative of major landforms were characterized for a variety of chemical, physical and mineralogical properties. Initially classification using Soil Taxonomy (Soil Survey Staff, 2006) identified the major soils as Typic Sulfaquents, Haplic Sulfaquents, Sulfic Hydraquents, and Thapto-Histic Sulfaquents. Using a proposed modification to Soil Taxonomy designed to better accommodate subaqueous soils with the new suborder of Wassents, soils of Chincoteague Bay were primarily classified as Fluvic Sulfiwassents, Haplic Sulfiwassents, Thapto-Histic Sulfiwassents, Sulfic Hydrowassents, and Sulfic Psammowassents. To illustrate the application of subaqueous soils information, the suitability of soils for submerged aquatic vegetation (SAV) habitat was assessed, based upon past and current growth patterns in Chincoteague Bay and sediment properties known to affect SAV establishment and growth. The refined soil-landscape models and extensive soil characterization obtained in this study have advanced our understanding of subaqueous soils in coastal lagoon systems, and should prove valuable to coastal specialists managing these critical resources. PEDOGENESIS, INVENTORY, AND UTILIZATION OF SUBAQUEOUS SOILS IN CHINCOTEAGUE BAY, MARYLAND By Danielle Marie Balduff Dissertation submitted to the Faculty of the Graduate School of the University of Maryland, College Park, in partial fulfillment of the requirements for the degree of Doctor of Philosophy 2007 Advisory Committee: Professor Martin C. Rabenhorst, Chair Professor Bruce James Dr. Douglas Levin Dr. Roberta Marinelli Assistant Professor Brian Needelman Associate Professor Karen Prestegaard © Copyright by Danielle Marie Balduff 2007 Acknowledgements This research was funded through a grant from the U.S. Department of Agriculture, Natural Resources Conservation Service. Thank you for your support. I sincerely thank all who have contributed to my success. Martin Rabenhorst, my advisor, who has passed on a great deal of knowledge and excitement for this field and who was an excellent and patient editor of this work, thank you for being a wonderful mentor. To my committee members, Bruce James, Doug Levin, Roberta Marinelli, Brian Needelman, and Karen Prestegaard, for teaching me concepts that have helped to make me a more well-rounded scientist and for your feedback and guidance on this work. I wish to thank Del Fanning for teaching me how to play bridge and for sharing his knowledge about pedology and mineralogy. I wish to express my appreciation to Richard Weismiller for allowing me to assist in teaching ENST 105 and for reminding me how much I like to teach and why I decided to pursue my Ph D in soil science. I wish to thank Susan Demas for providing me with a place to stay at her home during the summer of 2005, while I was doing my field work, thank you for your hospitality and your friendship. To Amanda Haase and Ross McAllen, my summer field assistants, who helped collect, describe, and sample the soils in Chincoteague Bay, thank you for having a great attitude and for your flexibility in dealing with boat engine problems, bad weather, and long days when the weather was perfect. To Cary Coppock for teaching me how to collect and describe subaqueous soils and to drive a boat and pull a trailer, thanks for all of your help. I wish to express my ii appreciation to Mark Stolt and Phil King teaching me how to describe and classify subaqueous soils, create subaqueous soil series, and in understanding landscape-soil relationships. I wish to thank Patrick Morton, Adam Gray, Rebecca Bourgault, Phil Zurheide, Karen Vaughan, John Wah, and Rosalynd Orr for your friendship, advice, and help in finishing my doctoral work. iii Table of Contents Acknowledgements............................................................................................................. ii Table of Contents...............................................................................................................iv List of Tables ..................................................................................................................... vi List of Figures.................................................................................................................... ix Chapter 1: Introduction....................................................................................................... 1 Background..................................................................................................................... 1 Study Area ......................................................................................................................2 Objectives ....................................................................................................................... 7 Chapter 2: Literature Review.............................................................................................. 8 Barrier Islands and Coastal Lagoons .............................................................................. 8 Chincoteague Bay ..................................................................................................... 14 Sediment Mapping in the Coastal Bays.................................................................... 19 Limitations of Previous Approaches......................................................................... 26 Subaqueous Soils .......................................................................................................... 30 Pedogenic Paradigm Extended to Subaqueous Environments.................................. 36 State Factors of Subaqueous Soil Formation............................................................ 38 Research on Subaqueous Soils.................................................................................. 41 Submerged Aquatic Vegetation Habitat Requirements ............................................ 49 Chapter 3: Topographic Analysis and Subaqueous Landforms........................................ 63 Introduction................................................................................................................... 63 Materials and Methods.................................................................................................. 65 Study Area ................................................................................................................ 65 Bathymetric Data Collection..................................................................................... 68 Evaluation of Maryland Geologic Survey Data........................................................ 73 Landform Delineation............................................................................................... 73 Results and Discussion ................................................................................................. 74 Subaqueous Topographic Maps................................................................................ 74 Subaqueous Landforms............................................................................................. 79 Conclusions................................................................................................................... 86 Chapter 4: Characterization and Classification of Subaqueous Soils in Chincoteague Bay, MD .................................................................................................................................... 87 Introduction................................................................................................................... 87 Materials and Methods.................................................................................................. 92 Study Site.................................................................................................................. 92 Soil Sampling............................................................................................................ 92 Laboratory Analysis.................................................................................................