2026-09-19T16:59:13Zhttps://dspace.mit.edu/server/oai/request

oai:dspace.mit.edu:1721.1/1141402024-05-15T05:50:45Zcom_1721.1_7582com_1721.1_7581col_1721.1_131024

Taylor Perron. Hamon, Jennifer L. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences 2018-03-12T19:31:34Z 2018-03-12T19:31:34Z 2010 2010 http://hdl.handle.net/1721.1/114140 1027787276 Thesis: S.B., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2010. Cataloged from PDF version of thesis. Includes bibliographical references (pages 32-33). Hillslopes evolve in response to base level change, sediment production, and sediment transport. Many previous studies have focused on hillslopes undergoing vertical base level migration due to tectonic forcing and bedrock incision. Many geomorphic features, however, are characterized by lateral hillslope retreat and have not been adequately studied. Here I adapt a theory of linear diffusive hillslope evolution to relate the velocity of lateral hillslope retreat to the steady-state hillslope form. A case study in a Florida sapping network, in which headward migration of seepage faces in a sandy soil sets the base level for the surrounding hillslopes, provides numerous opportunities to test the analytical model by direct measurement. Measurements of hillslopes in the Florida sapping network found quantitative agreement between the predicted and observed hillslope morphology. An expected relationship between geometric drainage area and channel growth velocity was not borne out in the data, but the distribution of measured v/K ratios is consistent with what I expect based on my preferential sampling of slow-moving gently-sloped heads. Several explanations are given to explain why the expected relationship with drainage area is not observed, and suggestions for future work based on these findings is offered. by Jennifer L. Hamon. S.B. 55 pages eng Massachusetts Institute of Technology MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission. http://dspace.mit.edu/handle/1721.1/7582 Earth, Atmospheric, and Planetary Sciences. Hillslope evolution in response to lateral base level migration Thesis application/pdf false Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="905d5a95-12e7-4c7b-97df-37b61df75b22"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>Hillslope evolution in response to lateral base level migration</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2010</PublicationDate> <Authors> <Author> <DisplayName>Hamon, Jennifer L.</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Earth, Atmospheric, and Planetary Sciences.</Keyword> <Abstract>Hillslopes evolve in response to base level change, sediment production, and sediment transport. Many previous studies have focused on hillslopes undergoing vertical base level migration due to tectonic forcing and bedrock incision. Many geomorphic features, however, are characterized by lateral hillslope retreat and have not been adequately studied. Here I adapt a theory of linear diffusive hillslope evolution to relate the velocity of lateral hillslope retreat to the steady-state hillslope form. A case study in a Florida sapping network, in which headward migration of seepage faces in a sandy soil sets the base level for the surrounding hillslopes, provides numerous opportunities to test the analytical model by direct measurement. Measurements of hillslopes in the Florida sapping network found quantitative agreement between the predicted and observed hillslope morphology. An expected relationship between geometric drainage area and channel growth velocity was not borne out in the data, but the distribution of measured v/K ratios is consistent with what I expect based on my preferential sampling of slow-moving gently-sloped heads. Several explanations are given to explain why the expected relationship with drainage area is not observed, and suggestions for future work based on these findings is offered.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>