numerical modelling of induced rip currents by discontinuous submerged breakwaters

نویسندگان

mohammad javad ketabdari

faculty of marine technology, amirkabir university of technology, hafez avenue, tehran, iran m. barzegarpaiinlamouki

department of marine technology, amirkabir university of technology, hafez avenue, tehran, iran

چکیده

submerged breakwaters are one of the shore protective structures. any discontinuity in these breakwaters causes changes on current parameters including speed and water surface profile. in this paper, discontinuous submerged breakwaters were modelled to investigate the changes in the wave and flow pattern.to investigate the phenomenon, three models including a shore with constant slope, a shore with continuous submerged breakwater and a shore with discontinuous breakwater were used. extended boussinesq equations were used for wave generation. the results of the models showed that in the shore without breakwaters transient rip currents are produced across the shore. by addition of the breakwater, the wave breaking happens on the crest of breakwater which leads to dissipation of their energy. this in turn creates calm shore currents. however, constructing a gap in the center of breakwater causes some changes in the system of shore currents. this phenomenon generates a pair of flow vortices and a powerful return current called rip current. rip currents not only threaten the life of swimmers, but also play an important role on the sediment transportation and erosion of the sea bed around the breakwater gap and may lead to destruction of the whole breakwater.

برای دانلود باید عضویت طلایی داشته باشید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Numerical modelling of induced rip currents by discontinuous submerged breakwaters

Submerged breakwaters are one of the shore protective structures. Any discontinuity in these breakwaters causes changes on current parameters including speed and water surface profile. In this paper, discontinuous submerged breakwaters were modelled to investigate the changes in the wave and flow pattern.To investigate the phenomenon, three models including a shore with constant slope, a shore ...

متن کامل

Wave Reflection at Submerged Breakwaters

Several types of structures are used in Coastal Engineering with the aim of preventing shoreline erosion, such as groynes, detached breakwaters, submerged breakwaters, etc. Submerged breakwaters have the advantage of their minimal visual impact, which has made them ever more popular (Chang & Liou, 2007). When the incoming waves impinge on a submerged breakwater, a process of energy transformati...

متن کامل

Rip Currents

Scientific T To examine the spatial and temporal variability of rip currents using remote video imaging techniques. T To quantify changes in nearshore circulation and topography in response to varying incident wave conditions at different time scales including; P wave groupiness (time scales of 1-10 minutes), P tidal modulation (time scales of 12h and 24 h) and P wave height fluctuations associ...

متن کامل

Rip Currents Onshore Submarine Canyons

The long-term goals of this research are to understand the dynamics of rip currents generated by largescale variations in alongshore pressure gradients and wave forcing, and the impact of rip currents on nearshore bathymetry. These goals will be accomplished collaboratively using field observations and numerical models, and will be pursued as part of the Nearshore Canyon Experiment (NCEX) sched...

متن کامل

The interaction of surface water waves with submerged breakwaters

Article history: Received 19 October 2007 Received in revised form 19 February 2008 Accepted 20 February 2008 Available online 18 April 2008 This paper concerns the behaviour of nonlinear regular waves interacting with rectangular submerged breakwaters. A new series of experimental results is presented and compared with numerical calculations based upon a Boundary Element Method (BEM) that util...

متن کامل

3D numerical modelling of submerged and coastal landslide propagation

The analysis of the propagation phase plays a fundamental role in the assessment and forecasting of risks related to the occurrence of submerged and coastal landslides. At present there are few numerical models able to simulate the propagation of such a type of events. This paper presents fully 3D models and approaches developed by the authors and suitable for the simulation of both completely ...

متن کامل

منابع من

با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید


عنوان ژورنال:
international journal of marine science and engineering

جلد ۴، شماره ۱، صفحات ۱۵-۲۴

میزبانی شده توسط پلتفرم ابری doprax.com

copyright © 2015-2023