ارزیابی فشار دینامیکی وارد بر صفحه موج نفوذپذیر ترکیبی تحت تابش امواج منظم

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکتری سازه‌های آبی، دانشگاه تبریز

2 دانشیار گروه مهندسی آب، دانشگاه تبریز

3 استاد گروه عمران-آب، دانشگاه تبریز.

4 استادیار گروه مهندسی آب، دانشگاه تبریز

5 دانشیار گروه عمران-آب، دانشگاه تبریز

چکیده

سازه­های عمودی به‌طور گسترده در سراسر دنیا به‌منظور حفاظت از سواحل، برای موج­شکن­های نوع کیسونی و به شکل دیوار ساحلی مورد استفاده قرار می­گیرند.استفاده از صفحه موج عمودی می­تواند راه حل مؤثری برای حل مشکل اتلاف انرژی موج زمانی­که امکان به­کارگیری سازه توده سنگی شیب­دار وجود ندارد، باشد. در این مطالعه، فشار وارد بر جانمایی­های متفاوت صفحه موج ترکیبی تحت تابش امواج منظم به‌صورت آزمایشگاهی مورد بررسی قرار گرفت. صفحه موج یک دیوار نفوذپذیر است که از بالای سطح آب تا سطح بستر گسترش یافته است. فاصله بین لوله­های سازه شرایط تبادل آب دریا، انتقال رسوب و عبور ماهی­ها را فراهم می­کند. نتایج این مطالعه امکان طراحی بهتر سازه­های عمودی را ایجاد می­کند. آزمایش­هانشان داد که فشار بی­بعد ناشی از برخورد موجمنظم با صفحه موج با کاهش عمق آب نسبی و افزایش عمق جانمایی افزایش می­یابد. این افزایش در اثر افزایش عمق جانمایی در بیش­ترین حالت برای سازه ترکیبی 2/3-5 حدود 52 درصد و برای سازه ترکیبی 2/3-4 حدود 47 درصد
می­باشد. هم­چنین تأثیر تغییر عمق جانمایی بر دامنه فشار بیش­تر از تغییر قطر استوانه­های سازه می­باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Evaluation of Dynamic Pressure on Compound Perforated Wave Screen under Regular Waves

نویسندگان [English]

  • Naval Azam 1
  • Farzin Salmasi 2
  • Mohammad Ali Lotfollahi Yaghin 3
  • Javad Parsa 4
  • Ali Reza Mojtahedi 5
1 Ph.D. Student, Department. of Water Eng., University of Tabriz, Iran
2 Associate Professor, Department. of Water Engineering, Tabriz University, Iran
3 Professor, Department. of Civil Engineering, University of Tabriz, Iran
4 Assistant Professor, Department. of Water Engineering, Tabriz University, Iran
5 Associate Professor, Department. of Civil Engineering, University of Tabriz, Iran
چکیده [English]

Coasts play an important role in economy of each country for their strategic location for residential, recreational, and industrial activities. Hence, a need has arisen to protect and maintain these coasts against waves and currents. (Rageh et al., 2009).
The main cause of damage to coastal structures is the wave impact force. Protective structures such as submerged breakwaters, screen breakwaters, and various piles are often designed to provide additional attenuation of the impact force impact. The use of vertical slotted barriers can be a cost effective solution for wave energy dissipation when sloped rubble structures are not desirable. For a cost-effective design of such barriers, an accurate estimation of dynamic pressures characteristics is needed.
Many experimental and theoretical studies were carried out for determining the dynamic pressures acting on different shapes or structures supported on piles. Neelamani & Sandhya (2005) investigated wave reflections, run-up and run-down, and wave pressures on plane, dentate and serrated seawalls. Krishnakumar et al. (2010) studied the effect of wave screens on the reduction of pressures and forces on a vertical wall on its lee side due to directional waves. Shih (2016) investigated the performance of a pervious pipe screen breakwater installed in front of a seawall in terms of reducing the wave impact force and wave pressure. The preceding brief review suggests that there is not much experimental data published on the wave induced dynamic pressures acting on compound wave screen. In this study, experimental investigations on wave pressures on different compound wave screen configurations were carried out in regular wave. The wave screen consists of a perforated wall that extends from above the seawater to above the seabed. The gap between pipes allows the seawaterexchange, the sediment transport and the fish passage and the results of this study can be used for a better hydrodynamic design of vertical structures.

کلیدواژه‌ها [English]

  • Wave Screen
  • Dynamic Pressure
  • Regular Wave
  • Shore Protection

مراجع

1-    Ahmed, H. 2011. Wave Interaction with Vertical Slotted Walls as a Permeable Breakwater. Ph.D. thesis in Institute for Geo-technic, Waste Management and Hydro Sciences (IGAW), University of Wuppertal, Germany.
 
2-    Alkhalidi, M., Neelamani, S. and Assad, A.I.A.H., 2015. Wave forces and dynamic pressures on slotted vertical wave barriers with an impermeable wall in random wave fields. Ocean Engineering, 109, pp.1-6.
 
3-    Anandkumar, G., Sundar, V., Graw, K.U. and Kaldenhoff, H., 1995. Pressures and forces on inclined cylinders due to regular waves. Ocean Engineering, 22(7), pp.747-759.
 
 
4-    Dean, R .G. Dalrymple, R. A. 1991. Water wave mechanics for engineers and scientists. World scientific. Delaware University, USA. 371p.
 
 
5-     Hall, K. 2000. Wave transmission through multi-layer wave screens. M.Sc. thesis at Queen's university, Kingston, Ontario, Canada.
 
6-     Hughes, S.A., 1993. Physical models and laboratory techniques in coastal engineering (Vol. 7). World Scientific.
 
7-    Kisacik, D.  Troch, P. Van Bogaert, P. 2012. Description of loading conditions due to violent wave impacts on a vertical structure with an overhanging horizontal cantilever slab. Coastal Engineering. 60(1): 201–226.
 
8-    Krishnakumar, C. Sunder, V. and Sannasiraj, S. A. 2010. Pressures and forces due to directional waves on a vertical wall fronted by wave screens. Applied Ocean Research. 32 (1): 1-10.
 
 
9-     Neelamani, S. and Sandhya, N., 2005. Surface roughness effect of vertical and sloped seawalls in incident random wave fields. Ocean engineering, 32(3-4), pp.395-416.
 
10-  Rageh, O.S. and Koraim, A.S., 2010. Hydraulic performance of vertical walls with horizontal slots used as breakwater. Coastal Engineering, 57(8), pp.745-756.
 
11-  Reddy, M.S. and Neelamani, S., 1992. Wave transmission and reflection characteristics of a partially immersed rigid vertical barrier. Ocean Engineering, 19(3), pp.313-325.
 
 
12-  Shih, R.S., 2016. Investigation of random wave impact on highly pervious pipe breakwaters. Applied Ocean Research, 58, pp.146-163.
 
13-  Sahoo, T., Lee, M.M. and Chwang, A.T., 2000. Trapping and generation of waves by vertical porous structures. Journal of engineering mechanics, 126(10), pp.1074-1082.
 
14-  Sundar, V., Koola, P.M. and Schlenkhoff, A.U., 1999. Dynamic pressures on inclined cylinders due to freak waves. Ocean engineering, 26(9), pp.841-863.
 
15-  Yagci, O., Kirca, V.S.O., Kabdasli, M.S., Celik, A.O., Unal, N.E. and Aydingakko, A., 2006. An experimental model application of wavescreen: Dynamic pressure, water particle velocity, and wave measurements. Ocean Engineering, 33(10), pp.1299-1321.
 
16-  Zhu, D., 2011. Hydrodynamic characteristics of a single-row pile breakwater. Coastal Engineering, 58(5), pp.446-451.
علوم و مهندسی آبیاری
دوره 41، شماره 3
آبان 1397
صفحه 89-102

فایل ها

سابقه مقاله

  • تاریخ دریافت: 09 آبان 1395
  • تاریخ بازنگری: 13 بهمن 1395
  • تاریخ پذیرش: 24 بهمن 1395
  • تاریخ انتشار: 01 آبان 1397

هم رسانی

ارجاع به این مقاله

آمار