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Lefebvre, Alice; Winter, Christian (2016): Predicting bed form roughness: the influence of lee side angle [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.858171, Supplement to: Lefebvre, A; Winter, C (2016): Predicting bed form roughness: the influence of lee side angle. Geo-Marine Letters, https://doi.org/10.1007/s00367-016-0436-8

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Abstract:
Flow transverse bedforms (ripples and dunes) are ubiquitous in rivers and coastal seas. Local hydrodynamics and transport conditions depend on the size and geometry of these bedforms, as they constitute roughness elements at the bed. Bedform influence on flow energy must be considered for the understanding of flow dynamics, and in the development and application of numerical models. Common estimations or predictors of form roughness (friction factors) are based mostly on data of steep bedforms (with angle-of-repose lee slopes), and described by highly simplified bedform dimensions (heights and lengths). However, natural bedforms often are not steep, and differ in form and hydraulic effect relative to idealised bedforms. Based on systematic numerical model experiments, this study shows how the hydraulic effect of bedforms depends on the flow structure behind bedforms, which is determined by the bedform lee side angle, aspect ratio and relative height. Simulations reveal that flow separation behind bedform crests and, thus, a hydraulic effect is induced at lee side angles steeper than 11 to 18° depending on relative height, and that a fully developed flow separation zone exists only over bedforms with a lee side angle steeper than 24°. Furthermore, the hydraulic effect of bedforms with varying lee side angle is evaluated and a reduction function to common friction factors is proposed. A function is also developed for the Nikuradse roughness (k s), and a new equation is proposed which directly relates k s to bedform relative height, aspect ratio and lee side angle.
Project(s):
Center for Marine Environmental Sciences (MARUM)
Comment:
angle-of-repose bedforms (AoR).lee side angle bedforms (LSA).
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 ExperimentExpLefebvre, Alice
2 Bedform lengthBf lmLefebvre, AliceDelft3D modeling system
3 Bedform heightBf hmLefebvre, AliceDelft3D modeling system
4 DEPTH, water, experimentDepth water expmLefebvre, AliceDelft3D modeling systemGeocode
5 AngleAngledegLefebvre, AliceDelft3D modeling systemlee side angle
6 AngleAngledegLefebvre, AliceDelft3D modeling systemstoss side angle
7 ZoneZoneLefebvre, AliceDelft3D modeling systemlength flow separation zone
8 FactorFactorLefebvre, AliceDelft3D modeling systemgrain friction
9 FactorFactorLefebvre, AliceDelft3D modeling systemform friction
10 RatioRatioLefebvre, AliceDelft3D modeling systemform factor / total friction factor [%]
11 FactorFactorLefebvre, AliceDelft3D modeling systemreduction
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
756 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
Exp		2 
Bf l [m]		3 
Bf h [m]		4 
Depth water exp [m]		5 
Angle [deg]
(lee side angle)		6 
Angle [deg]
(stoss side angle)		7 
Zone
(length flow separation zone)		8 
Factor
(grain friction)		9 
Factor
(form friction)		10 
Ratio
(form factor / total friction ...)		11 
Factor
(reduction)
LSA 160.02.05.03.813.8100.0046350.013094260.110068
LSA 160.02.05.06.002.8100.0046610.013094260.110685
LSA 160.02.05.09.002.4300.0080670.013094380.191565
LSA 160.02.05.010.002.3500.0080190.013094380.190423
LSA 160.02.05.011.002.311.07920.0080760.013094380.191774
LSA 160.02.05.012.002.271.28090.0087310.013094400.207341
LSA 160.02.05.013.002.241.60840.0097750.013094430.232134
LSA 160.02.05.014.002.202.75170.0121310.013094480.288074
LSA 160.02.05.015.002.192.67190.0131120.013094500.311376
LSA 160.02.05.016.002.152.91230.0158390.013094550.376124
LSA 160.02.05.017.002.143.83820.0192820.013094600.457903
LSA 160.02.05.018.002.123.6040.0197150.013094600.468184
LSA 160.02.05.019.002.123.58610.0201990.013094610.479675
LSA 160.02.05.020.002.114.28860.0263550.013094670.625874
LSA 160.02.05.021.002.094.32290.0277890.013094680.659918
LSA 160.02.05.024.002.065.49440.0374490.013094740.889310
LSA 160.02.05.027.002.055.47290.0403960.013094760.959302
LSA 160.02.05.030.002.035.78570.0421100.013094761.000000
LSA 260.02.012.03.813.8100.0004790.01105340.027666
LSA 260.02.012.06.002.8100.0007860.01105370.045412
LSA 260.02.012.09.002.4300.0024180.011053180.139623
LSA 260.02.012.010.002.3500.0014230.011053110.082155
LSA 260.02.012.011.002.3100.0014580.011053120.084184
LSA 260.02.012.012.002.2700.0020410.011053160.117868
LSA 260.02.012.013.002.2400.0024440.011053180.141157
LSA 260.02.012.014.002.2000.0026560.011053190.153393
LSA 260.02.012.015.002.1900.0035550.011053240.205315
LSA 260.02.012.016.002.1500.0042100.011053280.243113
LSA 260.02.012.017.002.142.4497290450.0059250.011053350.342142
LSA 260.02.012.018.002.121.9659132070.0072990.011053400.421499
LSA 260.02.012.019.002.121.4063797320.0072310.011053400.417609
LSA 260.02.012.020.002.112.3997330260.0090950.011053450.525240
LSA 260.02.012.021.002.093.0044256630.0106420.011053490.614565
LSA 260.02.012.024.002.064.9537208050.0150960.011053580.871776
LSA 260.02.012.027.002.055.1217204450.0164200.011053600.948221
LSA 260.02.012.030.002.035.1829075340.0173160.011053611.000000
LSA 360.02.040.03.813.8100.0011530.008944110.090563
LSA 360.02.040.06.002.8100.0009740.008944100.076519
LSA 360.02.040.09.002.4300.0021490.008944190.168816
LSA 360.02.040.010.002.3500.0013540.008944130.106378
LSA 360.02.040.011.002.3100.0011510.008944110.090407
LSA 360.02.040.012.002.2700.0011650.008944120.091553
LSA 360.02.040.013.002.2400.0012860.008944130.101029
LSA 360.02.040.014.002.2000.0022110.008944200.173704
LSA 360.02.040.015.002.1900.0024720.008944220.194162
LSA 360.02.040.016.002.1500.0035460.008944280.278530
LSA 360.02.040.017.002.1400.0042350.008944320.332672
LSA 360.02.040.018.002.121.35080.0056610.008944390.444743
LSA 360.02.040.019.002.121.26940.0054520.008944380.428313
LSA 360.02.040.020.002.112.14520.0065610.008944420.515408
LSA 360.02.040.021.002.092.90540.0082620.008944480.649018
LSA 360.02.040.024.002.064.52050.0108330.008944550.851003
LSA 360.02.040.027.002.055.04010.0118970.008944570.934625
LSA 360.02.040.030.002.035.01970.0127300.008944591.000000
AoR 1a200.02.08.030.000.585.7045410040.0384650.01193476
AoR 1a100.02.08.030.001.195.5194621150.0474870.01193480
AoR 1a50.02.08.030.002.475.2173116760.0628960.01193484
AoR 1a33.22.08.030.003.874.9137689550.0745200.01193486
AoR 1a25.22.08.030.005.294.6237338970.0833400.01193487
AoR 1a20.02.08.030.006.954.31065840.0875800.01193488
AoR 1b40.00.41.630.000.585.049843290.0576020.01672078
AoR 1b40.00.83.230.001.195.3539552510.0611850.01435981
AoR 1b40.01.66.430.002.475.2131603610.0656620.01246584
AoR 1b40.02.49.630.003.874.9178048180.0721760.01152686
AoR 1b40.03.212.830.005.294.66300020.0783680.01092288
AoR 1b40.04.016.030.006.954.2139094050.0842780.01048689
AoR 2a40.02.05.030.003.105.8406086810.0631690.01309483
AoR 2a40.02.010.030.003.105.3929450810.0291350.01143772
AoR 2a40.02.015.030.003.105.3077712140.0237750.01060969
AoR 2a40.02.020.030.003.105.4131619420.0221020.01007669
AoR 2a40.02.030.030.003.105.4053309070.0206760.00938969
AoR 2a40.02.040.030.003.105.2930928170.0203370.00894469
AoR 2b64.03.28.030.003.105.835019390.0618180.01193484
AoR 2b32.01.68.030.003.104.8060876710.0594650.01193483
AoR 2b21.01.18.030.003.104.7015724710.0483400.01193480
AoR 2b16.00.88.030.003.104.6555558150.0456140.01193479
AoR 2b11.00.58.030.003.104.5746942060.0414040.01193478
AoR 2b8.00.48.030.003.104.399798380.0398650.01193477