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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]
상세정보
- 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
- 로그인을 한후 보실 수 있는 자료입니다.
- Control Number
- joongbu:641743
MARC
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■007cr#unu||||||||
■020 ▼a9798379880552
■035 ▼a(MiAaPQ)AAI30516404
■035 ▼a(MiAaPQ)NCState_Univ18402040847
■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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