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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 Landsc...
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
저자명  
McDowell, Taylor M.
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  
Aeolian landscapes
키워드  
Cosmogenic nuclides
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  
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MARC

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■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.

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