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Assessments and Development of Protocols for Ncdot Stormwater Outlets to Minimize Erosion- [electronic resource]
Assessments and Development of Protocols for Ncdot Stormwater Outlets to Minimize Erosion- [electronic resource]

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자료유형  
 학위논문
Control Number  
0016932914
International Standard Book Number  
9798379880552
Dewey Decimal Classification Number  
628
Main Entry-Personal Name  
Waickowski, Sarah Elizabeth.
Publication, Distribution, etc. (Imprint  
[S.l.] : North Carolina State University., 2023
Publication, Distribution, etc. (Imprint  
Ann Arbor : ProQuest Dissertations & Theses, 2023
Physical Description  
1 online resource(476 p.)
General Note  
Source: Dissertations Abstracts International, Volume: 85-01, Section: A.
General Note  
Advisor: Heitman, Joshua L.;Doll, Barbara A.;Hunt, William F.
Dissertation Note  
Thesis (Ph.D.)--North Carolina State University, 2023.
Restrictions on Access Note  
This item must not be sold to any third party vendors.
Summary, Etc.  
요약Sediment pollution is a worldwide concern, and stormwater conveyance networks contribute to stream degradation and instability either through direct discharges of sediment or by eroding gullies downslope of pipe outlets. To limit erosion downslope of stormwater pipe outlets, current North Carolina regulations require designers to limit the peak velocity for the 10-yr, 24-hr storm event to the permissible velocity for the downslope soils'; otherwise the conveyance system must be redesigned. This study assessed 60 pipe outlets draining highway and non-highway areas in the Piedmont and Mountain physiographic regions of North Carolina to identify which watershed and downslope characteristics influence the severity of erosion caused by stormwater pipe outlets. The effectiveness of the current standard was also assessed. Six assessed sites in Raleigh were additionally monitored for hydrologic, hydraulic, and water quality impacts.A proposed channel evolution model (CEM) was developed from the 60 site assessments. The proposed five stages of degradation progress from an absence of erosion from the pipe outlet to the point of outfall to a receiving surface water (e.g., stream) (Stage I) to a headcut that has eroded to an impermeable layer as well as migrated to the pipe outlet and mass wasting is occurring (Stage V). Future research is needed to validate the CEM.Results from the assessments suggest the current practice of limiting the 10-yr, 24-hr velocity to the permissible velocity does not sufficiently protect against downslope erosion. Forty-eight of the 60 pipe outlets had erosion from the pipe outlet to the outfall (stream). The 12 sites that exhibited little to no erosion had heavy stands of mixed herbaceous and grassed vegetation, a lack of clustered trees, and a large percentage ( 50%) of moderately permeable hydrologic soil group (HSG) B soils downslope of the outlets.erosion. Forty-eight of the 60 pipe outlets had erosion from the pipe outlet to the outfall (stream). The 12 sites that exhibited little to no erosion had heavy stands of mixed herbaceous and grassed vegetation, a lack of clustered trees, and a large percentage ( 50%) of moderately permeable hydrologic soil group (HSG) B soils downslope of the outlets.Hydrologic data collected from the six sites were modelled to quantify the hydraulic impacts. The potential maximum erosion rate from ranged from 1.54*10-4 to 0.11 cm/s per storm event and indicate designers should include the erodibility of the soils downslope of pipe discharge points in their hydraulic analyses. The mean peak velocities ranged from 0.55 to 3.27 m/s and exceeded the permissible velocity referenced in North Carolina regulations at least 10 times during the 13-month monitoring period, despite none of the storms exceeding the sites' 10-yr, 24-hr rainfall depth. The gullies downslope of the pipe outlets eroded between 2 and 55 m3of soil. Given the magnitude of erosion downslope of the pipes and reoccurring exceedance of the permissible velocity, limiting the peak velocity for the 1-yr, 24-hr storm event to the permissible velocity may be a more effective standard to protect against downslope erosion.
Subject Added Entry-Topical Term  
Water quality.
Subject Added Entry-Topical Term  
Friction.
Subject Added Entry-Topical Term  
Farming.
Subject Added Entry-Topical Term  
Soil erosion.
Subject Added Entry-Topical Term  
Watersheds.
Subject Added Entry-Topical Term  
Roads & highways.
Subject Added Entry-Topical Term  
Watershed management.
Subject Added Entry-Topical Term  
Sediments.
Subject Added Entry-Topical Term  
Television programs.
Subject Added Entry-Topical Term  
Decision trees.
Subject Added Entry-Topical Term  
Monitoring systems.
Subject Added Entry-Topical Term  
Hydraulics.
Subject Added Entry-Topical Term  
Rain.
Subject Added Entry-Topical Term  
Stormwater.
Subject Added Entry-Topical Term  
Engineers.
Subject Added Entry-Topical Term  
Shear stress.
Subject Added Entry-Topical Term  
Agriculture.
Subject Added Entry-Topical Term  
Hydraulic engineering.
Subject Added Entry-Topical Term  
Mass communications.
Subject Added Entry-Topical Term  
Meteorology.
Subject Added Entry-Topical Term  
Sedimentary geology.
Subject Added Entry-Topical Term  
Soil sciences.
Subject Added Entry-Topical Term  
Transportation.
Subject Added Entry-Topical Term  
Water resources management.
Added Entry-Corporate Name  
North Carolina State University.
Host Item Entry  
Dissertations Abstracts International. 85-01A.
Host Item Entry  
Dissertation Abstract International
Electronic Location and Access  
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Control Number  
joongbu:641743

MARC

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■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a628
■1001  ▼aWaickowski,  Sarah  Elizabeth.
■24510▼aAssessments  and  Development  of  Protocols  for  Ncdot  Stormwater  Outlets  to  Minimize  Erosion▼h[electronic  resource]
■260    ▼a[S.l.]▼bNorth  Carolina  State  University.  ▼c2023
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2023
■300    ▼a1  online  resource(476  p.)
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  85-01,  Section:  A.
■500    ▼aAdvisor:  Heitman,  Joshua  L.;Doll,  Barbara  A.;Hunt,  William  F.
■5021  ▼aThesis  (Ph.D.)--North  Carolina  State  University,  2023.
■506    ▼aThis  item  must  not  be  sold  to  any  third  party  vendors.
■520    ▼aSediment  pollution  is  a  worldwide  concern,  and  stormwater  conveyance  networks  contribute  to  stream  degradation  and  instability  either  through  direct  discharges  of  sediment  or  by  eroding  gullies  downslope  of  pipe  outlets.  To  limit  erosion  downslope  of  stormwater  pipe  outlets,  current  North  Carolina  regulations  require  designers  to  limit  the  peak  velocity  for  the  10-yr,  24-hr  storm  event  to  the  permissible  velocity  for  the  downslope  soils';  otherwise  the  conveyance  system  must  be  redesigned.  This  study  assessed  60  pipe  outlets  draining  highway  and  non-highway  areas  in  the  Piedmont  and  Mountain  physiographic  regions  of  North  Carolina  to  identify  which  watershed  and  downslope  characteristics  influence  the  severity  of  erosion  caused  by  stormwater  pipe  outlets.  The  effectiveness  of  the  current  standard  was  also  assessed.  Six  assessed  sites  in  Raleigh  were  additionally  monitored  for  hydrologic,  hydraulic,  and  water  quality  impacts.A  proposed  channel  evolution  model  (CEM)  was  developed  from  the  60  site  assessments.  The  proposed  five  stages  of  degradation  progress  from  an  absence  of  erosion  from  the  pipe  outlet  to  the  point  of  outfall  to  a  receiving  surface  water  (e.g.,  stream)  (Stage  I)  to  a  headcut  that  has  eroded  to  an  impermeable  layer  as  well  as  migrated  to  the  pipe  outlet  and  mass  wasting  is  occurring  (Stage  V).  Future  research  is  needed  to  validate  the  CEM.Results  from  the  assessments  suggest  the  current  practice  of  limiting  the  10-yr,  24-hr  velocity  to  the  permissible  velocity  does  not  sufficiently  protect  against  downslope  erosion.  Forty-eight  of  the  60  pipe  outlets  had  erosion  from  the  pipe  outlet  to  the  outfall  (stream).  The  12  sites  that  exhibited  little  to  no  erosion  had  heavy  stands  of  mixed  herbaceous  and  grassed  vegetation,  a  lack  of  clustered  trees,  and  a  large  percentage  (  50%)  of  moderately  permeable  hydrologic  soil  group  (HSG)  B  soils  downslope  of  the  outlets.erosion.  Forty-eight  of  the  60  pipe  outlets  had  erosion  from  the  pipe  outlet  to  the  outfall  (stream).  The  12  sites  that  exhibited  little  to  no  erosion  had  heavy  stands  of  mixed  herbaceous  and  grassed  vegetation,  a  lack  of  clustered  trees,  and  a  large  percentage  (  50%)  of  moderately  permeable  hydrologic  soil  group  (HSG)  B  soils  downslope  of  the  outlets.Hydrologic  data  collected  from  the  six  sites  were  modelled  to  quantify  the  hydraulic  impacts.  The  potential  maximum  erosion  rate  from  ranged  from  1.54*10-4  to  0.11  cm/s  per  storm  event  and  indicate  designers  should  include  the  erodibility  of  the  soils  downslope  of  pipe  discharge  points  in  their  hydraulic  analyses.  The  mean  peak  velocities  ranged  from  0.55  to  3.27  m/s  and  exceeded  the  permissible  velocity  referenced  in  North  Carolina  regulations  at  least  10  times  during  the  13-month  monitoring  period,  despite  none  of  the  storms  exceeding  the  sites'  10-yr,  24-hr  rainfall  depth.  The  gullies  downslope  of  the  pipe  outlets  eroded  between  2  and  55  m3of  soil.  Given  the  magnitude  of  erosion  downslope  of  the  pipes  and  reoccurring  exceedance  of  the  permissible  velocity,  limiting  the  peak  velocity  for  the  1-yr,  24-hr  storm  event  to  the  permissible  velocity  may  be  a  more  effective  standard  to  protect  against  downslope  erosion.
■590    ▼aSchool  code:  0155.
■650  4▼aWater  quality.
■650  4▼aFriction.
■650  4▼aFarming.
■650  4▼aSoil  erosion.
■650  4▼aWatersheds.
■650  4▼aRoads  &  highways.
■650  4▼aWatershed  management.
■650  4▼aSediments.
■650  4▼aTelevision  programs.
■650  4▼aDecision  trees.
■650  4▼aMonitoring  systems.
■650  4▼aHydraulics.
■650  4▼aRain.
■650  4▼aStormwater.
■650  4▼aEngineers.
■650  4▼aShear  stress.
■650  4▼aAgriculture.
■650  4▼aHydraulic  engineering.
■650  4▼aMass  communications.
■650  4▼aMeteorology.
■650  4▼aSedimentary  geology.
■650  4▼aSoil  sciences.
■650  4▼aTransportation.
■650  4▼aWater  resources  management.
■690    ▼a0473
■690    ▼a0218
■690    ▼a0454
■690    ▼a0708
■690    ▼a0557
■690    ▼a0594
■690    ▼a0481
■690    ▼a0709
■690    ▼a0595
■71020▼aNorth  Carolina  State  University.
■7730  ▼tDissertations  Abstracts  International▼g85-01A.
■773    ▼tDissertation  Abstract  International
■790    ▼a0155
■791    ▼aPh.D.
■792    ▼a2023
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T16932914▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.
■980    ▼a202402▼f2024

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