Estimation of peak streamflows through channel geometry / Estimation de pics de débit fluviatiles à l'aide de la géométrie des cours d'eau

Bhatt, V. K.; Tiwari, Avinash

doi:10.1623/hysj.53.2.401

Cited by 16 publications

(3 citation statements)

References 14 publications

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“…For the present study, rational formula and SUH approach is applied for estimation of PFD though many approaches available (Bhatt and Tiwari, 2010;Dawod and Koshak, 2011). The procedures adopted in rational formula and SUH approach are given as below.…”

Section: Approaches For Estimation Of Pfdmentioning

confidence: 99%

Intercomparison of Rainfall Estimates of Three Distributions for Computation of PFD using Rational Formula and SUH Approach

Vivekanandan¹,

Srishailam²,

Patil³

2023

JCEU

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Peak flood discharge (PFD) for a given return period is considered as one of the most important parameters for planning and design of hydraulic structures, river protection works, and development of integrated water resources management projects. This can be achieved by adopting various methods such as flood frequency analysis, rational formula, envelope curves and Synthetic Unit Hydrograph (SUH) approach. Out of which, rational formula is applied for estimation of PFD for ungauged catchments with catchment area less than 25 km2 while SUH approach is adopted for ungauged catchments with catchment area more than 25 km2. This paper aims to investigate the study on intercomparison of probability distributions for estimation of extreme (i.e., 1-day maximum) rainfall for computation of PFD by adopting rational formula and SUH approach for the Vadhavan Port Project (VPP). The annual 1-day maximum rainfall series is extracted from the daily rainfall data observed at Dahanu site during the period 1969 to 2019 and also used for estimation of rainfall. The probability distributions viz., Extreme Value Type-1, 2-parameter Log Normal and Log Pearson Type-3 (LP3) adopted in extreme value analysis of rainfall is evaluated through diagnostic test using root mean square error and accordingly LP3 is adjudged as the best fit for estimation of rainfall. The 1-day maximum rainfall obtained from LP3 is considered to compute the rainfall intensity by applying one-third rule of IMD (India Meteorological Department) and also used for computation of PFD through rational formula. In SUH approach, the areal rainfall, physiographic and SUH parameters of the ungauged catchments are considered for computation of PFD. The study suggests the 25-year, 50-year and 100-year return period PFDs at six locations within the study area using rational formula and SUH approach could be considered for design purposes while designing any civil and hydraulic structures in the VPP.

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Section: Approaches For Estimation Of Pfdmentioning

confidence: 99%

Intercomparison of Rainfall Estimates of Three Distributions for Computation of PFD using Rational Formula and SUH Approach

Vivekanandan¹,

Srishailam²,

Patil³

2023

JCEU

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“…5G-K) and that median values are better representative values of channel width. This has implications for the application of other scaling relationships where small sample sizes are available; many such relationships are used including those with catchment area, meander wavelength, channel sinuosity, total river-atmosphere carbon dioxide flux, mean and peak discharge, and sediment transport mode (Leopold and Maddock, 1953;Bridge and Mackey, 1993;Bhatt and Tiwari, 2008;Gleason et al, 2018;Allen and Pavelsky, 2018;Frasson et al, 2019;Dunne and Jerolmack, 2020;Lyster et al, 2021).…”

Section: Down-dip Changes In Distributary Channel Width In Modern And...mentioning

confidence: 99%

Practical sampling criteria for using delta channel width to estimate paleodischarge in the rock record

Prasojo¹,

Yperen²,

Hoey³

et al. 2022

Preprint

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Quantifying paleodischarge from geological field observations have been for decades, and remains, a key research challenge. Several paleodischarge scaling relationships have been developed for fluvial environments, such as BQART, Fulcrum and regional hydraulic geometry or for river deltas by precluding the role of wave and tide. In deltas where marine (wave, tide) energy causes bidirectional flow, the available paleodischarge scaling relationships are not applicable. Here, the spatial variability of distributary channel widths from a database of 114 global modern river deltas is assessed to understand the limit of marine influence on distributary channel widths. Compiling 4459 distributary channel width measurements enables improvements to distributary channel width-discharge scaling relationships specifically for river-, tide- and wave-dominated deltas. By bootstrapping the channel widths measured from modern deltas, the minimum number of width measurements needed to apply width-discharge scaling relationships to ancient deltaic deposits is estimated as 3 and 30 for upstream and downstream river-dominated deltas, consecutively, 6 for upstream part of tide-dominated deltas and 4 for wave-dominated deltas. This estimate will guide sedimentologists who often have limited numbers of distributary channel widths exposed in the rock record. Statistically significant width-discharge scaling relationships are derived for river- and wave-dominated deltas, with no significant relationships identified for tide-dominated deltas. To test the reliability of these improved width-discharge scaling relationships in the rock record, paleodischarges were estimated for the well-studied Cretaceous lower Mesa Rica Formation, USA. Comparison of these results with the more complex Fulcrum method suggests that these new scaling relationships are accurate. Hence these scaling relationships obtained from modern deltas can be applied to the rock record, and this approach requires less, and easier to measure, data inputs than previously published methods.

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“…The main river flow (discharge of river) might be changed at a very large scale as human interruption takes place in term of occupying the place along the river bank or within the river basin [7]. Regression based approach is most commonly very useful for the ungauged sites for discharge estimation [8]- [10].…”

mentioning

confidence: 99%

Modeling of Discharge Distribution in Bend of Ganga River at Varanasi

Chauhan¹,

Dikshit²,

Dwivedi³

2015

CWEEE

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Dynamics of river behavior play a great role in meandering, sediment transporting, scouring, etc. of river at bend, which solely depends on hydraulics properties such as horizontal and vertical stress, spatial and temporal variation of discharge. Therefore understanding of discharge distribution of river Ganga is essential to apprehend the behavior of river cross section at bend particularly. The measurement of discharge is not very simple as there is no instrument that can measure the discharge directly, but velocity measurement at a section can be made. Velocity distribution at different cross sections at a time is also not easy with single measurement with the help of any instrument and method, so it required repetitions of the measurement. Velocity near the end of bank, top and bottom layer of natural streams is difficult to be measured, yet velocity distribution at these regions plays important role in characterizing the behavior of river. This paper deals with the new advanced discharge measurement technique and measured discharge data has been used for modelling at river bend. To carry out the distribution of discharge and velocity with depth in river Ganga, the length of river in study area was distributed into 14 different cross sections, M-1 to M-14, measured downstream to upstream and the measurement was done by using of ADCP (Acoustic Doppler Current Profiler). At each cross section, profiles were measured independently by an ADCP and data acquired from ADCP were further used for the regression modeling. A multiple linear regression model was developed, which showed a high correlation among the discharge, depth and velocity parameters with the root mean square error (R 2 ) value of 0.8624.

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Estimation of peak streamflows through channel geometry / Estimation de pics de débit fluviatiles à l'aide de la géométrie des cours d'eau

Cited by 16 publications

References 14 publications

Intercomparison of Rainfall Estimates of Three Distributions for Computation of PFD using Rational Formula and SUH Approach

Intercomparison of Rainfall Estimates of Three Distributions for Computation of PFD using Rational Formula and SUH Approach

Practical sampling criteria for using delta channel width to estimate paleodischarge in the rock record

Modeling of Discharge Distribution in Bend of Ganga River at Varanasi

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