Photo‐sieving: A method for grain‐size analysis of coarse‐grained, unconsolidated bedding surfaces

Ibbeken, Hillert; Schleyer, Ruprecht

doi:10.1002/esp.3290110108

Cited by 106 publications

(96 citation statements)

References 11 publications

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“…Given that the validation data consisted of bulk samples and that the calibration data consisted in photosieving grain size data, a bias was expected during validation. The obtained bias of À1.4% therefore seems to support the findings of Ibbeken and Schleyer [1986], who found that the bias associated to photosieving was sufficiently small to neglect correction factors. Furthermore, the small reported bias confirms field observations that clasts in the study river are generally weakly imbricated.…”

Section: Grain Size Data Qualitysupporting

confidence: 88%

“…These methods typically rely on photographs of the bed. Also called photosieving, they involve taking plan view images of gravels either in exposed areas [Adams, 1979;Ibbeken and Schleyer, 1986;Butler et al, 2001a] or shallow submerged areas [Whitman et al, 2003]. Generally, images of the riverbed are collected from standing position with some form of scale information in each image.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore photosieving is not applicable in cases where subsurface grain sizes are required. Second, the minimal clast size that can be analyzed is typically in the gravel range, for example, Ibbeken and Schleyer [1986] only considered particles coarser than 20 mm, and Butler et al [2001a] followed the recommendations of Wolman [1954], designed for manual grain size measurements, and set the lower threshold of measurable size to 8 mm. These thresholds are directly related to image scale.…”

Section: Introductionmentioning

confidence: 99%

“…Second is that the hiding effect of neighboring, overlapping, and interlocking (i.e., armored) clasts will cause additional bias. Ibbeken and Schleyer [1986] have found that while photosieving does cause a bias, this bias is acceptably small and the correction may usually be neglected. Adams [1979] found a significant bias and used an appropriate correction factor.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Catchment‐scale mapping of surface grain size in gravel bed rivers using airborne digital imagery

Carbonneau

Lane

Bergeron

2004

Water Resources Research

180

255

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[1] This study develops and assesses two methods for estimating median surface grain sizes using digital image processing from centimeter-resolution airborne imagery. Digital images with ground resolutions of 3 cm and 10 cm were combined with field calibration measurements to establish predictive relationships for grain size as a function of both local image texture and local image semivariance. Independently acquired grain size data were then used to assess the algorithm performance. Results showed that for the 3 cm imagery both local image semivariance and texture are highly sensitive to median grain size, with semivariance being a better predictor than image texture. However, in the case of 10 cm imagery, sensitivity of image semivariance and texture to grain size was poor, and this scale of imagery was found to be unsuitable for grain size estimation. This study therefore demonstrates that local image properties in very high resolution digital imagery allow for automated grain size measurement using image processing and remote sensing methods.

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Section: Grain Size Data Qualitysupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Catchment‐scale mapping of surface grain size in gravel bed rivers using airborne digital imagery

Carbonneau

Lane

Bergeron

2004

Water Resources Research

180

255

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“…Either the linear technique developed by Wolman (1954) or the photo-sieving technique developed by Ibbeken and Schleyer (1986) was used on the emerged bars, depending on the characteristics of the section. The latter technique entails photographing a zone of 1 m 2 through a grid of square sections (10 cm by 10 cm).…”

Section: Sediment Sizementioning

confidence: 99%

River dredging, channel dynamics and bedload transport in an incised meandering river (the River Semois, Belgium)

Gob

Houbrechts

Hiver³

et al. 2005

River Research & Apps

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Dredging in the rivers of the Ardenne is generally carried out on a smaller scale to that described in the literature and is not conducted for commercial purposes. Extractions within the river channel are made in order to prevent flooding; hence the quantity of gravel extracted is limited. This study aims to evaluate the impact of dredging and the resilience of the riverbed in the Semois. This river is found in the south of the Ardenne region and is characterized by large incised meanders, a narrow floodplain, few pebble bars, numerous bedrock outcrops and a limited stock of sediment. The bed is particularly flat and shallow and the bankfull discharge (130 m 3 s À1 ) is frequently attained (0.9 yr). Pebble tracers allowed the critical parameters (discharge, Shields criterion, and stream power), the diameter of mobilized sediment and the distance of sediment transport to be determined. A major dredging campaign resulted in the formation of a channel nearly 1 km long and 2 m deep which functioned as a sediment trap. Topographical cross-sections made before and after the dredging campaign and again 4 yr later allowed bedload discharge to be estimated (1.1 t km À1 yr À1 ). In order to examine the efficiency of the sediment trap, the sediment transport equations of Meyer-Peter and Müller, Schoklitsch, Bagnold and Martin were applied. With the exception of Bagnold's equation (1980), the observed transport values and those calculated theoretically are relatively close. Between October 1997 and June 2001, 5010 t were caught in the sediment trap. For the same period the equations calculate values between 6147 and 10 571 t. The overestimation from the theoretical calculations may result from a lack of sediment supply due to the characteristics of the basin and the frequency and magnitude of flood events during the study period. From the magnitude of the sediment transport rate, a return to the initial state of the riverbed (before dredging) may be expected after approximately 10 yr. Despite the scale of the dredging campaign for a river of this size, its results are limited in terms of flood prevention.

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Granulometric study of the Hanaupah Fan, Death Valley, California

Ibbeken

Warnke

Diepenbroek

1998

Earth Surf. Process. Landforms

Self Cite

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We applied new granulometric techniques to the various surfaces of the Hanaupah Fan, Death Valley, California, namely the Q1 surface, with an estimated age of 800-490 ka, the younger Q2 (170-105 ka) and Q3 (50-14 ka) surfaces, the <14 ka deposits of the incised channel, and to a (c. 14 ka) Lake Manly shoreline deposit at the northern periphery of the fan. We used these techniques to generate quantitative information on surface clast grain-size distributions, clast sphericity, roundness, and clast orientation to provide a data set that could be used to define fan-segment surfaces, and to help interpret fan genesis. Grain-size analyses were carried out by photo-sieving of 139 surface pictures, by petrographic identification of samples taken in the incised channel, and by identification and measuring of the largest clasts (1452 measurements) on the Q3 surface. The results show that all fan-segment surfaces, regardless of age, have similar size distributions, with a well-defined gravel mode of −2·3 to −3·0 phi, and are poorly to moderately sorted. Samples from the incised channel have distributions that are very similar to each other, regardless of distance from the apex, but display reduced sorting compared to the fan surfaces (which largely lack fines, perhaps from winnowing by secondary overland flow). Only the shoreline deposit is different from the other elements, showing a much narrower, well-defined gravel mode (−3·0 phi), and is moderately well sorted. Sphericity and roundness of clasts on all surfaces show only minor differences, similar to the other sedimentary parameters, indicating a remarkable homogeneity of the surfaces of the sediment body. In addition, measurements of the largest clasts (>100 cm long axis) on the Q3 surface showed no discernible trend either with radial distance or with rock type. These data suggest large depositional episodes that produce extensive sedimentary units without differentiation relative to distance from the source. Of the examined parameters, clast orientation is the best predictor of relative age of fan surfaces. Clast orientation in the main channel is bimodal, i.e. the long axes of clasts are either at right angles or parallel to transport direction. This bimodality disappears with increasing age, and the preferred orientation becomes unimodal (long clast axes normal to transport direction) on the Q1 surface. Although the causes of this change are still in debate, use of this parameter as a relative-age dating tool seems possible.

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Photo‐sieving: A method for grain‐size analysis of coarse‐grained, unconsolidated bedding surfaces

Cited by 106 publications

References 11 publications

Catchment‐scale mapping of surface grain size in gravel bed rivers using airborne digital imagery

Catchment‐scale mapping of surface grain size in gravel bed rivers using airborne digital imagery

River dredging, channel dynamics and bedload transport in an incised meandering river (the River Semois, Belgium)

Granulometric study of the Hanaupah Fan, Death Valley, California

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