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Unsaturated Zone Hydrology and Geochemical Tracers of Erosion in Stabilized Aeolian Landscapes of the Central Great Plains
Unsaturated Zone Hydrology and Geochemical Tracers of Erosion in Stabilized Aeolian Landscapes of the Central Great Plains
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152816
- ISBN
- 9798384012177
- DDC
- 910
- 서명/저자
- Unsaturated Zone Hydrology and Geochemical Tracers of Erosion in Stabilized Aeolian Landscapes of the Central Great Plains
- 발행사항
- [Sl] : The University of Wisconsin - Madison, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 243 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-02, Section: B.
- 주기사항
- Advisor: Mason, Joseph A.
- 학위논문주기
- Thesis (Ph.D.)--The University of Wisconsin - Madison, 2024.
- 초록/해제
- 요약The state of an aeolian system is often dependent on climate and vegetation, and currently, aeolian landscapes in the Great Plains are in a stable state due to vegetation cover. The Great Plains already experiences high interannual variability in precipitation, and this variability is projected to increase with 21st century climate change. These changes will likely affect vegetation in the region, and thus, landscape stability. The spatial patterns and rates of dune activity, dust deposition, and water erosion of loess landscapes have all varied in the past in response to climate change, but the complexity of plant-soil-geomorphic feedbacks limits our ability to link past changes directly to landscape activation. The goal of this dissertation is to better understand unsaturated zone hydrology, its response to climate change and implications for plant available moisture, and geochemical tracers of erosion in two aeolian landscapes, loess tablelands and sand dunes, in Nebraska. In Chapter 1, our objective is to understand how differences in soil hydraulic properties alter the soil hydrology of the two aeolian sediments. We used a numerical unsaturated flow model, Hydrus 1D, to simulate both water flow and root uptake. Compared to the dune sand, the loess had a broader pore-size distribution which resulted in higher volumetric water content, more negative matric potentials, lower hydraulic conductivity for wet soils, and higher hydraulic conductivity for dry soils. Unexpectedly, these differences did not lead to large differences in root uptake between the sediments. Chapter 2 extends the soil moisture modeling for future climate scenarios. Soil moisture was modeled for the same sediments throughout the 21st century. Results demonstrate the value of modeling long-term soil hydrology with a more realistic representation of soil physics, and while there was no clear long-term trend, there were large 10- to 20-year fluctuations between wet and dry periods of soil moisture mirroring the precipitation trends of increased variability. In Chapter 3, we evaluated the use of two geochemical tracers, meteoric 10Be and 137Cs, to estimate millennial- and decadal-scale erosion rates on loess tablelands. Results show that meteoric 10Be has great potential to estimate erosion rates in Holocene loess landscapes.
- 일반주제명
- Geography
- 일반주제명
- Hydrologic sciences
- 일반주제명
- Soil sciences
- 일반주제명
- Ecology
- 일반주제명
- Climate change
- 키워드
- Erosion
- 키워드
- Great Plains
- 키워드
- Soil hydrology
- 기타저자
- The University of Wisconsin - Madison Geography
- 기본자료저록
- Dissertations Abstracts International. 86-02B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520250211152816
■006m o d
■007cr#unu||||||||
■020 ▼a9798384012177
■035 ▼a(MiAaPQ)AAI31558781
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a910
■1001 ▼aMcDowell, Taylor M.
■24510▼aUnsaturated Zone Hydrology and Geochemical Tracers of Erosion in Stabilized Aeolian Landscapes of the Central Great Plains
■260 ▼a[Sl]▼bThe University of Wisconsin - Madison▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a243 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-02, Section: B.
■500 ▼aAdvisor: Mason, Joseph A.
■5021 ▼aThesis (Ph.D.)--The University of Wisconsin - Madison, 2024.
■520 ▼aThe state of an aeolian system is often dependent on climate and vegetation, and currently, aeolian landscapes in the Great Plains are in a stable state due to vegetation cover. The Great Plains already experiences high interannual variability in precipitation, and this variability is projected to increase with 21st century climate change. These changes will likely affect vegetation in the region, and thus, landscape stability. The spatial patterns and rates of dune activity, dust deposition, and water erosion of loess landscapes have all varied in the past in response to climate change, but the complexity of plant-soil-geomorphic feedbacks limits our ability to link past changes directly to landscape activation. The goal of this dissertation is to better understand unsaturated zone hydrology, its response to climate change and implications for plant available moisture, and geochemical tracers of erosion in two aeolian landscapes, loess tablelands and sand dunes, in Nebraska. In Chapter 1, our objective is to understand how differences in soil hydraulic properties alter the soil hydrology of the two aeolian sediments. We used a numerical unsaturated flow model, Hydrus 1D, to simulate both water flow and root uptake. Compared to the dune sand, the loess had a broader pore-size distribution which resulted in higher volumetric water content, more negative matric potentials, lower hydraulic conductivity for wet soils, and higher hydraulic conductivity for dry soils. Unexpectedly, these differences did not lead to large differences in root uptake between the sediments. Chapter 2 extends the soil moisture modeling for future climate scenarios. Soil moisture was modeled for the same sediments throughout the 21st century. Results demonstrate the value of modeling long-term soil hydrology with a more realistic representation of soil physics, and while there was no clear long-term trend, there were large 10- to 20-year fluctuations between wet and dry periods of soil moisture mirroring the precipitation trends of increased variability. In Chapter 3, we evaluated the use of two geochemical tracers, meteoric 10Be and 137Cs, to estimate millennial- and decadal-scale erosion rates on loess tablelands. Results show that meteoric 10Be has great potential to estimate erosion rates in Holocene loess landscapes.
■590 ▼aSchool code: 0262.
■650 4▼aGeography
■650 4▼aHydrologic sciences
■650 4▼aSoil sciences
■650 4▼aEcology
■650 4▼aClimate change
■653 ▼aAeolian landscapes
■653 ▼aCosmogenic nuclides
■653 ▼aErosion
■653 ▼aGreat Plains
■653 ▼aSoil hydrology
■690 ▼a0366
■690 ▼a0388
■690 ▼a0481
■690 ▼a0404
■690 ▼a0329
■71020▼aThe University of Wisconsin - Madison▼bGeography.
■7730 ▼tDissertations Abstracts International▼g86-02B.
■790 ▼a0262
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163978▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


