Abf - Three-dimensional view of the abbot from short to long to short

세예드 아마드가 헤리 네 자드 1 , Mehdi Behdarvandi Askar  2 , 모하마드 안사리 고이 가르 3, 에산 파르시 4
1 공학, 해안, 항만 및 & amp; 해양 구조물 _ 코람 샤르 해양 과학 기술 대학교
2 코람 샤르 해양 과학 기술 대학교 해양 공학부 해양 구조학과
3 이란 카라 지 테헤란 대학교 농업 및 천연 자원 대학 관개 및 매립 공학과.
4 연구 전문가, Arvand Water and Energy Consulting Engineers Company, Ahvaz, Iran.

Abstract

The development of water waves through submerged and non-submerged vegetation is accompanied by a loss of energy through the resistive force of the vegetation, resulting in a decrease in wave height. Wave damping by vegetation is a function of cover characteristics such as geometry and structure, immersion ratio, density, hardness, and spatial arrangement, as well as wave conditions such as input wave height, duration, and wave direction. In the present study, the effect of geometric arrangement of vegetation with variable height on wave damping has been investigated using the Flow 3D numerical model. For this purpose, a channel with a length of 480 cm and a width of 10.8 cm, which has been previously used by Cox and Wu (2015) to study the effect of plant density with variable height on wave damping, is modeled. The operation of the three arrangements, including long to short arrangement, short to long arrangement, and zigzag arrangement, is examined under four different waves, all of which are linear waves. It should be noted that in this study, wave height is considered as an damping index. The results obtained by measuring the height of the waves at four different points along the channel show that the behavior of the waves in dealing with different arrangements follows a fixed pattern and also changes in the geometry of the vegetation can greatly lead to Increase the damping of the waves. The results show that a change in height arrangement can cause a change in damping of up to 7.1%.

Keywords : Green belt , wave , geometric layout , vegetation

물에 잠긴 초목과 물에 잠기지 않은 초목을 통한 물결의 발달은 초목의 저항력을 통한 에너지 손실을 동반하여 파고가 감소합니다. 식생에 의한 파동감쇠는 기하와 구조, 몰입도, 밀도, 경도, 공간배열 등 커버 특성과 입력파동 높이, 지속시간, 파동방향 등의 파동조건의 함수입니다.

본 연구에서는 Flow 3D 수치 모델을 사용하여 가변 높이 식물이 파동 댐핑에 미치는 기하학적 배치가 조사되었습니다. 이를 위해 Cox와 Wu (2015)가 이전에 파동 댐핑에 대한 가변 높이의 발전소 밀도가 미치는 영향을 연구하기 위해 사용한 길이 480cm, 폭 10.8cm의 채널을 모델링합니다.

장파에서 단파, 단파에서 장파까지, 지그재그 배열을 포함한 세 가지 배열의 작동은 4개의 다른 파장에서 조사됩니다. 모두 선형파입니다.

본 연구에서는 파고가 감쇠 지수로 간주된다는 점에 유의해야 합니다.

채널을 따라 네 곳의 서로 다른 지점에서 파도의 높이를 측정하여 얻은 결과는 다른 배열을 다루는 파도의 동작이 고정된 패턴을 따르며 또한 초목의 기하학적인 변화가 파도의 감쇠를 증가 시키는 것으로 크게 이어질 수 있다는 것을 보여줍니다.

결과는 높이 배열의 변화가 최대 7.1%의 댐핑 변화를 일으킬 수 있음을 보여줍니다.

Figure 1 - Geometry used by Cox and Wu (2015) to study the effect of plant density on wave damping
Figure 1 – Geometry used by Cox and Wu (2015) to study the effect of plant density on wave damping
Figure 2 - Schematic of Erie wave
Figure 2 – Schematic of Erie wave
Abf - Three-dimensional view of the abbot from short to long to short
Abf – Three-dimensional view of the abbot from short to long to short

References

خلیلی نفت­چالی، آ. خزیمه­نژاد، ح. اکبرپور، ا. ورجاوند، پ. 1394. بررسی آزمایشگاهی تأثیر تراکم پوشش گیاهی بر مشخصه‌های جریان غلیظ. نشریه آبیاری و زهکشی ایران. 9 (1): 95-83.
زارعی، م. فتحی­مقدم، م. داوودی، ل. 1395. بررسی اثر پوشش گیاهی ساحلی بر میرایی نیروی مخرب امواج منفرد ناشکنا در سواحل شیبدار. نشریه مهندسی آبیاری و آب ایران. 7 (26): 75-62.
گرمئی، ا. امامی، ح. خراسانی، ر. 1396. اثر تراکم سه نوع پوشش گیاهی بر میزان رواناب و رسوب در حاشیه شهر مشهد. نشریه آبیاری و زهکشی ایران. 11 (1): 20-11.
فضلی، س. نور، ح. 1396. شبیه‌سازی و ارزیابی اثر سناریوهای مختلف درصد پوشش گیاهی بر فرسایش خاک. نشریه آبیاری و زهکشی ایران. 11 (4): 571-562.
قنبری عدیوی، ا. فتحی مقدم، م. 1393. مروری بر تحقیقات استهلاک و میرایی امواج دریا از طریق پوشش گیاهی ساحلی. فصلنامه علوم و فناوری دریا. 18 (70): 62-54.
معتمدی­نژاد، ع. فتحی­مقدم، م. زارعی، م. 1394. بررسی آزمایشگاهی اثر پوشش گیاهی ساحلی بر کاهش نیروی امواج شکنا. دهمین سمینار بین المللی مهندسی رودخانه. دانشگاه شهید چمران اهواز، اهواز، ایران.
میرزاخانی، گ. قنبری عدیوی، ا. فتاحی­نافچی، ر. 1398. میرایی موج توسط پوشش گیاهی صلب در سواحل. دومین همایش ملی مدیریت منابع طبیعی با محوریت آب، سیل و محیط زیست. دانشگاه گنبد کاووس، گنبد کاووس، ایران.
Asano, T. S. Sutsui, T. and Sakai.T. 1988. Wave damping characteristics due to seaweed. Proceedings of the 35th Coastal Engineering Conference in Japan. JSCE. 138-142 (in Japanese).
Asano, T., Deguchi, H. and N. Kobayashi. 1992. Interactions between water waves and vegetation. Proceedings of the 23rd International Conference on Coastal Engineering. ASCE. 2710-2723.
Augustin, L.N., Irish, J.L. and Lynett, P. 2009. Laboratory and numerical studies of wave damping by emergent and nearemergent wetland vegetation. Coastal Engineering. 56(3): 332-340.
Cavallaro L., Re, C.L., Paratore, G., Viviano, A. and Foti, E. 2010. Response of Posidonia oceanic to wave motion in shallowwaters: Preliminary experimental results. Proceedings of the 32nd International Conference on Coastal Engineering. Coastal Engineering Research Council. 1-10.
Cook, H.L. and Campbell, F.B. 1939. Characteristics of some meadow strip vegetation. Agricultural Engineering. 20:345-348.
Cooper, N.J. 2005. Wave dissipation across intertidal surfaces in the Wash Tidal inlet, Eastern England. Journal of Coastal Research. 21(1): 28-40.
Dean, R.G. 1979. Effects of vegetation on shoreline erosional processes. Wetland Function and Values: The State of Our Understanding. 1: 415-426.
Dean, R.G., and Dalrymple, R.A. 1991. Water Wave Mechanics for Engineers and Scientist. World Scientific Publishing.Singapore.
Dubi, A. 1995. Damping of water waves by submerged vegetation: A case study on Laminaria hyperborea. PhD thesis. University of Trondheim, the Norwegian Institute of Technology, Trondheim, Norway.
Fathi Moghadam, M., Drikundi, K.h., Masjidi, A. and M. 2012. Investigation of the Effect of Vegetation Density and Flexibility on Roughness Coefficients in Riverside and Flood Plains, Iranian Water Resources Research Quarterly, Year 8, Issue 2, Fall 91.
Fathi Moghadam, M. and Zaraei, M. 2016. Investigation of the Effect of Coastal Vegetation on the Damping of Destructive Force of Unbreakable Individual Waves on Shabidar Coasts, Journal of Irrigation and Water Engineering, Year 7, No. 26.
Furukawa, K., Wolanski, E. and Mueller, H. 1997. Currents and sediment transport in mangrove forests. Estuar Coast Shelf Sci 44:301–310.
Harada, K. and Imamura, F. 2006. Experimental study on the resistance by mangrove under unsteady flow, Proc. Congress. Asian and Pacific Coastal Engineering Dalia, 984-975.
Jellilund, R., M. Zeid Ali, L. Nouri Hindi and M. 2012. Investigating the advantages and disadvantages of protection and organization of beaches with vegetation against morphological changes, Fifth National Conference and Specialized Environment Exhibition, 90.
Journal 629, Guide to the Design and Implementation of a Coastal Protection Structure.
Kongko, W. 2004. Study on tsunami energy dissipation in mangrove forest, Master Thesis Report, wate University, Japan, 43 pages.
Kutija, V. and Erduran, K. S. 2003. Quasi-three-dimensional numerical model for flow through flexible, rigid, submerged and non-sub merged vegetation. Journal of Hydro informatics. 35(3): 189-202.
Li, R.M. and Shen, H.W. 1973. Effect of tall vegetations on flow and sediment. Journal of the Hydraulics Division, ASCE. 99(5):739-814.
Wu, W.C. and Cox, D, T. 2015. Effects of Vertical Variation in Vegetation Density on Wave Attenuation. Journal of Waterway, Port, Coastal and Ocean Engineering. Volume 142 Issue 2.