Comparison between Calculation and Measurement of Total Sediment Load: Application to Nestos River

Avgeris, Loukas; Kaffas, Konstantinos; Hrissanthou, Vlassios

doi:10.3390/environsciproc2020002019

Cited by 3 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both of Yang's equations were calibrated especially for Nestos River (northeastern Greece) on the basis of available measurements for bed load and suspended load. Regarding the comparison between predicted and measured values of total load transport rate, the values of the statistical criteria used for both equations were very satisfactory, as reported by Avgeris et al [22].…”

Section: Introductionsupporting

confidence: 67%

See 1 more Smart Citation

Extending the Applicability of the Meyer–Peter and Müller Bed Load Transport Formula

Sidiropoulos

Vantas

Hrissanthou

et al. 2021

Water

Self Cite

View full text Add to dashboard Cite

The present paper deals with the applicability of the Meyer–Peter and Müller (MPM) bed load transport formula. The performance of the formula is examined on data collected in a particular location of Nestos River in Thrace, Greece, in comparison to a proposed Εnhanced MPM (EMPM) formula and to two typical machine learning methods, namely Random Forests (RF) and Gaussian Processes Regression (GPR). The EMPM contains new adjustment parameters allowing calibration. The EMPM clearly outperforms MPM and, also, it turns out to be quite competitive in comparison to the machine learning schemes. Calibrations are repeated with suitably smoothed measurement data and, in this case, EMPM outperforms MPM, RF and GPR. Data smoothing for the present problem is discussed in view of a special nearest neighbor smoothing process, which is introduced in combination with nonlinear regression.

show abstract

Section: Introductionsupporting

confidence: 67%

“…. , r iN } (24) be the set of the distances of p i from all other parameter vectors, as computed according to Equation (22). Let r i,i1 , r i,i2 , .…”

Section: Nearest Neighbor Smoothingmentioning

confidence: 99%

Extending the Applicability of the Meyer–Peter and Müller Bed Load Transport Formula

Sidiropoulos

Vantas

Hrissanthou

et al. 2021

Water

Self Cite

View full text Add to dashboard Cite

show abstract

Comparison between Calculation and Measurement of Total Sediment Load: Application to Streams of NE Greece

2022

View full text Add to dashboard Cite

Sediment transport and stream discharge are two of the natural procedures which affect the hydromorphological profile of a watercourse. Measurements of water discharge, bed load transport rate and suspended sediment concentration were conducted in Kosynthos River and Kimmeria Torrent –two intermittent streams– in north-eastern Greece. The total sediment concentration was calculated, in both streams, by means of various nonlinear regression equations and by means of the formulas of Yang, after calibrating the coefficients of the formulas. In the computations according to the Yang formulas, two different states were examined regarding the incipient motion: one considering and one disregarding the critical conditions. The results obtained from Yang’s multiple regression-derived equations had a better fit compared to the original equations and were acceptable in both cases. Ultimately, two counterparts of Yang’s stream sediment transport formulas were constructed and made available to the readership. The comparison between the calculated and measured total sediment concentrations was achieved by means of several statistical criteria. The results indicate that the modified formulas of Yang can be successfully used for the determination of the total sediment concentration in Kosynthos River and Kimmeria Torrent.

show abstract

Measurement and Calculation of Sediment Transport on an Ephemeral Stream

Avgeris,

Kaffas,

Hrissanthou

2024

Hydrology

View full text Add to dashboard Cite

Sediment transport remains a significant challenge for researchers due to the intricate nature of the physical processes involved and the diverse characteristics of watercourses worldwide. A type of watercourse that is of particular interest for study is the ephemeral streams, found primarily in semiarid and arid regions. Due to their unique nature, a new measurement algorithm was created and a modified bed load sampler was built. Measurement of the bed load transport rate and calculation of the water discharge were conducted in an ephemeral stream in Northeastern Greece, where the mean calculated streamflow rate ranged from 0.019 to 0.314 m3/s, and the measured sediment load transport rates per unit width varied from 0.00001 to 0.00213 kg/m/s. The sediment concentration was determined through various methods, including nonlinear regression equations and formulas developed by Yang, with the coefficients of these formulas calibrated accordingly. The results demonstrated that the equations derived from Yang’s multiple regression analysis offered a superior fit compared to the original equations. As a result, two modified versions of Yang’s stream sediment transport formulas were developed and are presented to the readership. To assess the accuracy of the modified formulas, a comparison was conducted between the calculated total sediment concentrations and the measured total sediment concentrations based on various statistical criteria. The analysis shows that none of Yang’s original formulas fit the available data well, but after optimization, both modified formulas can be applied to the specific ephemeral stream. The results indicate also that the formulas derived from the nonlinear regression can be successfully used for the determination of the total sediment concentration in the ephemeral stream and have a better fit compared to Yang’s formulas. The correlation from the nonlinear regression equations suggests that total sediment transport is primarily influenced by water discharge and rainfall intensity, with the latter showing a high correlation coefficient of 0.998.

show abstract

Comparison between Calculation and Measurement of Total Sediment Load: Application to Nestos River

Cited by 3 publications

References 7 publications

Extending the Applicability of the Meyer–Peter and Müller Bed Load Transport Formula

Extending the Applicability of the Meyer–Peter and Müller Bed Load Transport Formula

Comparison between Calculation and Measurement of Total Sediment Load: Application to Streams of NE Greece

Measurement and Calculation of Sediment Transport on an Ephemeral Stream

Contact Info

Product

Resources

About