PENGARUH PERIODIK PERGERAKAN BUMI, BULAN, DAN MATAHARI TERHADAP KONSTANTA PASANG SURUT DAN MSL (Studi Kasus Stasiun Pasang Surut Surabaya, Jawa Timur)
| Main Authors: | , FARCHAN SAFRI BANNA, , Leni Sophia Heliani, S.T., M.Sc., D.Sc |
|---|---|
| Format: | Thesis NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2014
|
| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/127076/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=67319 |
Daftar Isi:
- The periodic movement of the Earth, the Moon, and the Sun determines the variety and type of sea tides that occurs on the Earth. Each of those astonomical objects would give different effects to the sea tides harmonic constants that is formed. Harmonic constants and mean sea level at a same location can have a vary values depends on how long period of the sea tides data observed. This research is intended to knows which periodic motions of the Earth, the Moon, and the Sun in the observation period of one month, one year, and 8,85 years that most optimum to determine the amplitude value of harmonic constants and mean sea level. The tidal data used tide gauge height at Surabaya port observation station from BIG (Badan Informasi Geospasial) that taken during 1984 � 2004. Those data was grouped into three groups, i.e. one month, one year, and 8,85 years. The group that consist one month data was formed due to the revolution of the Moon, the one year group due to the revolution of the Earth, and the 8,85 years group due to the presesion motion of the Moon. Harmonic analysis was performed to each data group to get the harmonic constants and mean sea level values. The results were evaluated by comparing them with harmonic constants value from DISHIDROS and do statistical significance tests. The tidal data groups from this research shows some errors so its needed to be corrected. The error such as data spike and gap data were replaced with NaN (Not a Number), and data errors such as data shifting and anomaly on height of tides values range were processed by doing shifting and scaling correction on those tides data. The results of harmonic analysis shows that the longer the tidal data period the more number of harmonic constants produced. The 8,85 years data group produced the highest quantities of harmonic constants with 69 number of harmonic constants. The harmonic constants on one month group has the smallest difference with DISHIDROS data by 0 � 11 Cm, it shows the quality of amplitude value depended on the quality of tidal data. Significance test for one month and one year data group against 8,85 years data group results shows significant difference on the constants harmonic that produced. MSL value from harmonic analysis results show insignificant difference with span of margins from 1 � 3 Cm. This research concludes that the most optimum and eficient period data is one year data group, it�s because even with shorter data period the one year group can generate not too different results with long data period of 8,85 years observation.