서브메뉴
검색
Evolution of Mixed Bedrock-Alluvial Rivers and Applications to Neogene Landscape Evolution the High Plains, Colorado, USA
Evolution of Mixed Bedrock-Alluvial Rivers and Applications to Neogene Landscape Evolution the High Plains, Colorado, USA
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103118
- ISBN
- 9798314899137
- DDC
- 551
- 서명/저자
- Evolution of Mixed Bedrock-Alluvial Rivers and Applications to Neogene Landscape Evolution the High Plains, Colorado, USA
- 발행사항
- [Sl] : University of Colorado at Boulder, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 233 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
- 주기사항
- Advisor: Tucker, Gregory;Jones, Craig.
- 학위논문주기
- Thesis (Ph.D.)--University of Colorado at Boulder, 2025.
- 초록/해제
- 요약Across much of Earth's surface, rivers are the primary agents of sediment transport and set the pace of bedrock erosion. Bedload sediment transport and bedrock erosion are closely interrelated: higher bedrock erosion rates can produce more sediment, but high fluxes of coarse sediment can mantle riverbeds and inhibit erosion. Moreover, sediment load is a dynamic quantity, constantly being modified by changes in local bedrock lithology, hillslope contributions, and attrition of grains in transport. Developing models that fully capture the feedbacks between sediment transport and bedrock erosion remains a challenge; however, the pursuit of such a model is critical to understanding how landscapes evolve over geologic time. This dissertation focuses on advancing our understanding of the behaviors of gravel-bed rivers - a class of rivers with morphologies adjusted to sediment flux over decadal or centennial timescales, but that also commonly incise bedrock over geologic timescales. This work explores the feasibility and implications of coupling dynamic channel geometry adjustment, sediment transport, bedload modification, and bedrock erosion in a fluvial model. The model then lends insight into how accounting for feedbacks between sediment cc and bedrock erosion can improve our understanding of landscape response to tectonic perturbations.This dissertation is organized across five chapters. In the first chapter, I introduce the reader to several themes that will recur throughout this work: some basics of fluvial geomorphology, the role of sediment in modulating bedrock erosion rates, the idea of an "equilibrium" channel, and a brief overview of the High Plains landscape in Colorado. The second chapter focuses on developing a mathematical model that allows for bedrock erosion and equilibrium channel adjustments to proceed simultaneously; Chapter 3 then uses a slightly modified version of that model to explore how river profiles in one dimension respond to variations in sediment load. Chapter 4 applies a two-dimensional implementation of the model to investigate if disturbing a fluvial system via long-wavelength tilting of the land surface can produce erosional patterns similar to those observed on the High Plains today. Finally, Chapter 5 offers concluding remarks, identifies several new questions raised by this work, and outlines opportunities for future study.
- 일반주제명
- Geology
- 일반주제명
- Geomorphology
- 일반주제명
- Geophysics
- 키워드
- Alluvial channel
- 키워드
- Bedrock erosion
- 키워드
- River
- 기타저자
- University of Colorado at Boulder Geology
- 기본자료저록
- Dissertations Abstracts International. 86-11B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017357026
■00520260202103118
■006m o d
■007cr#unu||||||||
■020 ▼a9798314899137
■035 ▼a(MiAaPQ)AAI31937682
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a551
■1001 ▼aGabel, Vanessa Jean.▼0(orcid)0009-0006-1209-9636
■24510▼aEvolution of Mixed Bedrock-Alluvial Rivers and Applications to Neogene Landscape Evolution the High Plains, Colorado, USA
■260 ▼a[Sl]▼bUniversity of Colorado at Boulder▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a233 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-11, Section: B.
■500 ▼aAdvisor: Tucker, Gregory;Jones, Craig.
■5021 ▼aThesis (Ph.D.)--University of Colorado at Boulder, 2025.
■520 ▼aAcross much of Earth's surface, rivers are the primary agents of sediment transport and set the pace of bedrock erosion. Bedload sediment transport and bedrock erosion are closely interrelated: higher bedrock erosion rates can produce more sediment, but high fluxes of coarse sediment can mantle riverbeds and inhibit erosion. Moreover, sediment load is a dynamic quantity, constantly being modified by changes in local bedrock lithology, hillslope contributions, and attrition of grains in transport. Developing models that fully capture the feedbacks between sediment transport and bedrock erosion remains a challenge; however, the pursuit of such a model is critical to understanding how landscapes evolve over geologic time. This dissertation focuses on advancing our understanding of the behaviors of gravel-bed rivers - a class of rivers with morphologies adjusted to sediment flux over decadal or centennial timescales, but that also commonly incise bedrock over geologic timescales. This work explores the feasibility and implications of coupling dynamic channel geometry adjustment, sediment transport, bedload modification, and bedrock erosion in a fluvial model. The model then lends insight into how accounting for feedbacks between sediment cc and bedrock erosion can improve our understanding of landscape response to tectonic perturbations.This dissertation is organized across five chapters. In the first chapter, I introduce the reader to several themes that will recur throughout this work: some basics of fluvial geomorphology, the role of sediment in modulating bedrock erosion rates, the idea of an "equilibrium" channel, and a brief overview of the High Plains landscape in Colorado. The second chapter focuses on developing a mathematical model that allows for bedrock erosion and equilibrium channel adjustments to proceed simultaneously; Chapter 3 then uses a slightly modified version of that model to explore how river profiles in one dimension respond to variations in sediment load. Chapter 4 applies a two-dimensional implementation of the model to investigate if disturbing a fluvial system via long-wavelength tilting of the land surface can produce erosional patterns similar to those observed on the High Plains today. Finally, Chapter 5 offers concluding remarks, identifies several new questions raised by this work, and outlines opportunities for future study.
■590 ▼aSchool code: 0051.
■650 4▼aGeology
■650 4▼aGeomorphology
■650 4▼aGeophysics
■653 ▼aAlluvial channel
■653 ▼aBedrock erosion
■653 ▼aRiver
■653 ▼aSediment Sediment
■690 ▼a0372
■690 ▼a0484
■690 ▼a0373
■71020▼aUniversity of Colorado at Boulder▼bGeology.
■7730 ▼tDissertations Abstracts International▼g86-11B.
■790 ▼a0051
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357026▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
