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ITS » Master Theses » Teknik Manajemen Pantai - S2
Posted by yeni at 04/01/2007 11:04:08  •  4716 Views


ANALISIS PENGARUH MANGROVE TERHADAP REDUKSI ENERGI GELOMBANG

ANALYSE OF INFLUENCE THE MANGROVE ON REDUCE WAVE REFLECTION

Created by :
Lekatompessy, Sonja T. A.  



Keywordrefleksi gelombang
mangrove
struktur pelindung pantai.

Description:

Tinjauan refleksi gelombang dalam struktur pelindung pantai adalah penting. Refleksi gelombang merupakan parameter untuk mengukur seberapa besar kemampuan suatu bangunan memantulkan gelombang. Diperlukan suatu perencanaan bangunan yang tepat guna mendapatkan reduksi koefisien refleksi gelombang. Tujuan dari penelitian ini adalah untuk mengetahui hubungan antara besarnya koefisien refleksi gelombang (Kr) yang terjadi dengan kerapatan akar mangrove. Penelitian ini menyajikan hasil percobaan model fisik pengukuran refleksi gelombang pada 4 model mangrove dengan variasi kerapatan akar. Gelombang yang dibangkitkan berupa gelombang reguler dengan variasi periode gelombang (T) antara 5 dt sampai 8 dt, dan variasi tinggi gelombang (H) antara 0.15 m sampai 0.4 m. Pemodelan yang digunakan adalah kesebangunan geometrik undistorted model dengan skala 1:4. Pengukuran gelombang dilakukan dengan menggunakan dua buah wave probe di depan struktur dengan variasi jarak probe 1 dan 2 (L) yaitu 0.75 m, 1 m dan 1.25 m, sehingga diperoleh data profil gelombang (η1 dcm η2). Dengan data η tersebut dapat diketahui besarnya koefisien refleksi gelombang (Kr) oleh struktur. Dari hasil percobaan ini disimpulkan bahwa struktur mangrove cenderung mereduksi refleksi gelombang pada pengujian periode gelombang pendek terhadap tinggi gelombang yang besar pada tiap-tiap percobaan. Kr terkecil terjadi pada variasi gelombang masukan T= 5 dt terhadap H= 0.4 m. Koefisien refleksi (Kr) dari hasil percobaan besarnya antara 0.07 - 0.99. Dari keempat model yang diuji, koefisien refleksi gelombang terkecil Kr = 0.067 - 0.15 dihasilkan oleh mangrove model 1 dengan kerapatan terbesar dan kondisi periode gelombang terkecil T = 5 detik serta tinggi gelombang terbesar H = 0.4 m.


Alt. Description

The wave reflection in coastal protection structure is important. Wave Reflection represent the parameter to measure the ability of structure to reflect wave. The accurate structure planning is needed to find the reduction of wave reflection coefficient. The aim of this research is to know the relation between wave reflection coefficient (Kr) that happened with strongly on the density of the mangrove. This research present result of attempt physic model of measurement wave reflection on 4 mangrove model with the variation mangrove density. Regular waves having various wave periods (T) between 5 sec until 8 sec, and various wave heights (H) between 0.15 m until 0.4 m. This physic model is used by geometric similarity (undistorted model) with the scale 1 : 4. Wave measurement is conducted by using two wave probe in front of the structure with the distance variation of probes (L) 0.75 m, 1 m and 1.25 m,] so that obtained data of wave profile ( η1 and η2). With the data knowable the level of wave reflection coefficient ( Kr) by structure. From this attempt result is concluded by that structure mangrove tend to reduce the wave reflection at the examination of short wave period on high of big wave at every attempt. The Smallest Kr is resulted by wave variation input T= 5 sec on H=0.4 m. The result of wave reflection coefficient (Kr) from attempt is 0.07 - 0.99. From 4 model the examinee, smallest wave reflection coefficient is Kr = 0.067 - 0.15 yielded by mangrove model 1 with the strongest density, smallest wave period condition T = 5 sec, and highest wave H = 0.4 m.

Contributor:
  1. Ir. Arief Suroso, M.Sc Dr. Ir. Wahyudi, M.Sc
Date Create:04/01/2007
Type:Text
Format:pdf; 50 pages
Language:Indonesian
Identifier:ITS-Master-3100004019185
Collection ID:3100004019185
Call Number:583.42 Lek a


Source :
Theses Beach Management Engineering RTPe 583.42 Lek a, 2003

Coverage :
ITS Community

Rights :
Copyright @2003 by ITS Library. This publication is protected by copyright and permission should be obtained from the ITS Library prior to any prohibited reproduction, storage in a retrievel system, or transmission in any form or by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permission(s), write to ITS Library


Publication URL :
http://digilib.its.ac.id/analisis-pengaruh-mangrove-terhadap-reduksi-energi-gelombang-604.html




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gelombang , mangrove , pantai. , pelindung , refleksi , refleksi gelombang , struktur , struktur pelindung pantai.



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