Experimental Study on Extreme Hydrodynamic Loading on Pipelines Part 2: Induced Force Analysis

Round 1

Reviewer 1 Report

This experimental study of tsunami bore loading on pipelines is pioneering and important. However, the paper can be improved by considering the following points:

The section number is in wrong order: " 2. experimental set up,,,, 1.2 experimental program.... , 2 Results and discussion ".

2. The conclusion section should be elaborated and the implications/applications of the findings should be addressed. Resistance and lift coefficients have a wide range, what is the usefulness?

3. Grammar and editing should be improved and checked for the entire paper. Language and writing style need to be polished.

Author Response

Please see attachment.

Author Response File: Author Response.docx

Reviewer 2 Report

Ghodoosipour et al. presented an experimental study on the impact of dam-break tsunami-induced hydraulic bores interacting with horizontally-mounted pipelines, paying attention on the horizontal and vertical hydrodynamic forces. The quality of the current experimental work is good and the involved topic is interesting since it investigates problems not analyzed in the literature. Some improvements should be carried out to clarify some parts in order to optimize the overall quality of the paper. All the Reviewer’s request are listed as follows:

1. Introduction

·         Please add references related to works dealing with the interaction between waves or current and submarine pipelines such as: F. Aristodemo, G.R. Tomasicchio, P. Veltri, New model to determine forces at on-bottom slender pipelines. Coastal Engineering, 58(3), pp. 267-280, 2011. Moreover, concerning the wave loads induced by tsunami-like waves, I suggest to cite an important paper related to the interaction between tsunami-like solitary waves and horizontal circular cylinders: F. Aristodemo, G. Tripepi, D.D. Meringolo, P. Veltri, Solitary wave-induced forces on horizontal circular cylinders: Laboratory experiments and SPH simulations. Coastal Engineering, 129, pp. 17-35, 2017.

·         More specifically, the quantity e represents the distance between the lower part of the pipe and the ground.

·         Define the meaning of the stagnation and the separation points.

·         Figure 1 as well as the discussion on the vortex shedding suppression refers to currents or wind-generated waves? Please specify.

·         Correct geometryand with geometry and.

·         Add the equation for the lift force.

2.2.1 Force time-history for the dry bed condition

·         With reference to Fig. 6, why the drag force for h = 30 cm is greater than the other two depths for t > 4 s?

2.2.1 Force time-history for the wet bed condition

·         With reference to Fig. 8, why the maximum peak of the lift force is reached by using e/D = 0.3?

2.3 Force coefficients

·         To what depth was the horizontal velocity measured? Generally, the value of u refers to free stream conditions, i.e. without the disturbance of the pipe.

·         In Figs. 10 and 11, insert only CR and CL along y-axis.

·         For practical purposes, is it possible to find an empirical relationship to calculate CR and CL as a function of Fr?

·         A comparison of your results for CR and CL with other literature investigations related to the wave forces generated by wind waves and/or currents is needed.

Author Response

Please see the attachemnet.

Author Response File: Author Response.docx