Estimate of Continuous Sediment Graphs in a Basin, Using a Composite Mathematical Model

The 4th EWaS International Conference: Valuing the Water, Carbon, Ecological Footprints of Human Activities

Hrissanthou

2020

Measurements of stream discharge, bed load transport rate and suspended sediment concentration in the Nestos River (northeastern Greece) were conducted by the Section of Hydraulic Engineering, of the Civil Engineering Department, Democritus University of Thrace. In addition to those measurements, the total sediment concentration was calculated by means of the formulas of Yang. The comparison between the calculated and measured total sediment concentration was achieved by means of several statistical criteria and the results were deemed satisfactory.

Section: Introductionmentioning

confidence: 99%

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

Avgeris

The 4th EWaS International Conference: Valuing the Water, Carbon, Ecological Footprints of Human Activities

Hrissanthou

2020

“…Yang's unit stream power theory has been applied in a plethora of cases in literature, both continuously [48,49] and event-based [50,51]. Quaintly, nonetheless successfully, it has also been applied for estimating overland flow erosion capacity [52,53].…”

Section: Unit Stream Power Theory Of Yang For Sediment Transport In Nmentioning

confidence: 99%

A Fuzzy Transformation of the Classic Stream Sediment Transport Formula of Yang

Saridakis

Spiliotis

et al. 2020

Water

The objective of this study is to transform the arithmetic coefficients of the total sediment transport rate formula of Yang into fuzzy numbers, and thus create a fuzzy relationship that will provide a fuzzy band of in-stream sediment concentration. A very large set of experimental data, in flumes, was used for the fuzzy regression analysis. In a first stage, the arithmetic coefficients of the original equation were recalculated, by means of multiple regression, in an effort to verify the quality of data, by testing the closeness between the original and the calculated coefficients. Subsequently, the fuzzy relationship was built up, utilizing the fuzzy linear regression model of Tanaka. According to Tanaka’s fuzzy regression model, all the data must be included within the produced fuzzy band and the non-linear regression can be concluded to a linear regression problem when auxiliary variables are used. The results were deemed satisfactory for both the classic and fuzzy regression-derived equations. In addition, the linear dependence between the logarithmized total sediment concentration and the logarithmized subtraction of the critical unit stream power from the exerted unit stream power is presented. Ultimately, a fuzzy counterpart of Yang’s stream sediment transport formula is constructed and made available to the readership.

“…Bed load measurements were accomplished by means of a net trap, while suspended load measurements were carried out by infiltrating a sample of water through a filter paper. A detailed description of the measurements' procedure can be found in [17].…”

Section: Model Validationmentioning

confidence: 99%

Soil Erosion, Streambed Deposition and Streambed Erosion—Assessment at the Mountainous Terrain

Hrissanthou

2018

EWaS3 2018

An Integrated Mathematical Model (IMM) is applied at a continuous time scale in Nestos River basin (Macedonia–Thrace border, northeastern Greece). The IMM comprises a rainfall–runoff submodel, a soil erosion submodel, a streambed deposition submodel and a streambed erosion submodel, and computes sediment yields at the outlet of the basin, at fine time steps and for long periods of time. Soil erosion is estimated by means of the Modified Universal Soil Loss Equation (MUSLE), deposition of sediment load is modeled by the formulas of Einstein and Pemberton and Lara, while streambed erosion is estimated through the formula of Smart and Jaeggi. The application of the IMM enables the computation of annual sediment yields, at the outlet of the basin.