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20222
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Subject: Civil Engineering × Author: Dinesh Kumar × End date: 2024 × Start date: 2020 × Type: Thesis ×
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    ThesisItemOpen Access
    Prediction of the scour depth around bridge piers using HEC-RAS model and empirical equations
    (G.B. Pant University of Agriculture and Technology, Pantnagar, District Udham Singh Nagar, Uttarakhand. PIN - 263145, 2022-09) Dinesh Kumar; Mahar, P.S.
    The main cause of the collapse of a hydraulic structure such as a bridge is the scouring around the bridge piers. The discharge, depth of flow, morphology of the pier, and distribution of sediment particle size all have a role in the complicated process known as scouring. The scour depth at the piers of the Gaula bypass road bridge in Haldwani, India, has been evaluated in the current study using empirical equations and the HEC-RAS numerical model and the results are compared. A flood frequency study using Gumbel's distribution method has been conducted for the Gaula river Haldwani basin in Uttarakhand, India. In the study, floods having a return period of 5 to 1000 years have been considered. Grain size distribution analysis was performed for the soil samples collected from the river bed near the bridge piers to calculate d50 and d95. Using field data, a hydraulic model of the river at the bridge location was developed. Then, variations in flow discharge for scouring along the bridge were explored by inputting the scouring data of bridge piers for discharges with return periods of 5 to 1000 years. The study has revealed that several of the empirical equations are not sensitive to an increase in flow discharge, and the results are similar for floods of different return periods. However, the centre and lateral piers of the bridge showed an increase in scouring as the flow increased, according to the results of the HEC-RAS model. The scour depth pattern is nearly constant throughout all discharges. Additionally, the increasing discharge has a significant impact on both the left and right abutments. The scour depths for discharges with return periods of 5 and 1000 years were 5.47 m and 10.22 m, respectively by HEC-RAS. The effect of a gabion check dam proposed downstream of the bridge on the siltation of scoured river beds near the bridge piers and abutments has been also investigated by using HEC-RAS. In the study, it has been found that the river bed profile elevation gets significantly increased as a result of the construction of the check dam.
  • Thumbnail Image
    ThesisItemOpen Access
    Prediction of the scour depth around bridge piers using HEC-RAS model and empirical equations
    (G.B. Pant University of Agriculture and Technology, Pantnagar, District Udham Singh Nagar, Uttarakhand. PIN - 263145, 2022-09) Dinesh Kumar; Mahar, P.S.
    The main cause of the collapse of a hydraulic structure such as a bridge is the scouring around the bridge piers. The discharge, depth of flow, morphology of the pier, and distribution of sediment particle size all have a role in the complicated process known as scouring. The scour depth at the piers of the Gaula bypass road bridge in Haldwani, India, has been evaluated in the current study using empirical equations and the HEC-RAS numerical model and the results are compared. A flood frequency study using Gumbel's distribution method has been conducted for the Gaula river Haldwani basin in Uttarakhand, India. In the study, floods having a return period of 5 to 1000 years have been considered. Grain size distribution analysis was performed for the soil samples collected from the river bed near the bridge piers to calculate d50 and d95. Using field data, a hydraulic model of the river at the bridge location was developed. Then, variations in flow discharge for scouring along the bridge were explored by inputting the scouring data of bridge piers for discharges with return periods of 5 to 1000 years. The study has revealed that several of the empirical equations are not sensitive to an increase in flow discharge, and the results are similar for floods of different return periods. However, the centre and lateral piers of the bridge showed an increase in scouring as the flow increased, according to the results of the HEC-RAS model. The scour depth pattern is nearly constant throughout all discharges. Additionally, the increasing discharge has a significant impact on both the left and right abutments. The scour depths for discharges with return periods of 5 and 1000 years were 5.47 m and 10.22 m, respectively by HEC-RAS. The effect of a gabion check dam proposed downstream of the bridge on the siltation of scoured river beds near the bridge piers and abutments has been also investigated by using HEC-RAS. In the study, it has been found that the river bed profile elevation gets significantly increased as a result of the construction of the check dam.