Jurnal Rekayasa
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Cover Belakang Jurnal Rekayasa Edisi Agustus 2014
No full textCover Belakang Jurnal Rekayasa Edisi Agustus 201
PEMODELAN PERIODIK DAN STOKASTIK UNTUK MENGANALISIS DATA CURAH HUJAN YANG HILANG MENGGUNAKAN STUDI KASUS STASIUN HUJAN SUKARAME
Full text linkoai:ojs.ft-sipil.unila.ac.id:article/206Rainfall data is very important for planning in engineering, especially for hydrology buildings
such as water irrigation, dams, urban drainage, ports, docks, etc. Rainfall has periodic and sto -
chastic parts, and influenced by climatic parameters such as temperature, wind direction, humid-
ity, etc. These parameters are transferred into the periodic and stochastic rainfall components.
The rainfall is calculated to determine both, periodic and stochastic components. The missing data
were caused by the malfunction of operation of the recording in the rain stations or human error
itself
PENGARUH WAKTU PEMERAMAN TERHADAP DAYA DUKUNG STABILISASI TANAH LEMPUNG LUNAK MENGGUNAKAN TX-300
Full text linkSoil is a material that serves as an support for the basis of a constuction, be it construction of
buildings, bridges and roads. Each region has different soil characteristics in other regions, there
is high and has a bearing capacity of those that are low. To improve the soil characteristics that
can lead to low bearing capacity, the necessary repairs to soil stabilization methods. Stabilization
efforts are often undertaken by stabilizing additives. In this research using a chemical additive
material that is TX-300, which is expected to improve the characteristics of the soil so the soil is
worthy of a construction established.
Soil samples that tested in this research is the soft clay are derived from Rawa Sragi, East
Lampung. This study used soil mixed with ash content about 0,9 ml with the optimum variation of
curing time used is 7 days, 14 days and 28 days. Based on the test of physical properties of
original soil, AASHTO classifies soil samples in group A-7 (clay soil) and subgroup A-7-5, while
the USCS classifies soil samples as fine-grained soil and belonging to CH group.
The results of laboratory studies indicate that the stabilization material using TX-300 can improve
the physical and mechanical properties of soft clay. The soil that has been stabilized with TX 300
has increased the value of specific gravity and bearing capacity and it is decreased of liquid limit
and indeks plastisity of soft clay. Based on the test results, this type of clay is not too good to be
used as a ground subgrade for road construction, because its PI’s value is about ≥ 10% despite
value of CBR is plenty high
KAJIAN SPATIAL ENCLOSURE PADA PENATAAN RUANG JALAN Studi Kasus : Penataan Koridor Perdagangan di Kawasan Teluk Betung Bandar Lampung
Full text linkDalam penataan kawasan perkotaan, khususnya penataan koridor jalan, survei visual menjadi
salah satu metode yang signifikan yang dapat memberikan persepsi dan data empiris kawasan
yang berguna dalam pemecahan masalah perancangan. Salah satu metode dalam melakukan
survei dan sekaligus analisis ruang perkotaan adalah dengan pengamatan terhadap aspek spatial
enclosure ruang jalan. Spatial enclosure adalah tingkatan atau derajat ketertutupan ruang yang
memberikan kesan dan persepsi psikologis terhadap pengamat. Persepsi psikologis ini berbeda-
beda, tergantung pada proporsi dan skala ruang yang terbentuk berdasarkan perbandingan an-
tara jarak elemen vertikal dan ketinggian elemen vertikalnya.
Melalui survei visual terhadap proporsi dan skala ruang jalan, maka dapat diketahui tingkat
ketertutupan ruang suatu jalan yang menjadi dasar dalam analisis dan perencanaan ruang jalan.
Proporsi diketahui dengan mengukur ketinggian pelingkup vertikal (dinding/h) terhadap jarak
datar (lantai/tanah/d) yang dibentuk oleh elemen keras (hardscape) maupun lunak (softscape).
Penelitian ini bertujuan untuk mengetahui spatial enclosure pada koridor jalan di kawasan perda-
gangan Teluk Betung melalui analisis rancangan yang terbentuk. Hasil penelitian menunjukkan
bahwa rancangan ruang jalan di area studi terdiri atas main enclosure dan secondary enclosure.
Main enclosure memberikan efek psikologis dalam konteks skala kawasan dan kota, sementara
secondary enclosure memberikan efek psikologis pada tingkat kawasan dan mikro. Penataan lebih
rinci pada area secondary enclosure dapat menjadi kunci dalam melunakkan efek psikologis ru-
ang yang ditimbulkan dan menciptakan ruang koridor yang berkarakter
Analisis Kinerja Jaringan Jalan di Provinsi Lampung dengan Menggunakan Pemodelan Transportasi
Full text linkOn the purpose of future transportation service requirement accomodation, traffic network and
public transportation development are needed, it is needed to connect all transportation modes.
With limited budget of Lampung Province, this kind of development needs reference, so it can have
integrated planning. The purpose of this reasearch are to recognise the movement pattern and the
effect of wisdom application that relates to transportation network on Lampung Province, and to
recognise the effect of development planning on transportation network.. Domain of the research
are province street and national street in Lampung Province, Data of Origin Destination Matrix
on 2009, which used in this reasearch are secondary data that obtain from daily survey data with
Furness Method to get the sum of movement on wisdom application planning.
The result of the research are (1) Amount of movement patterns show a continous movement pat-
tern of people from Palembang to Java Island and vice versa on 2014 is 8 million passengers for a
year and from Bengkulu to Java Island and vice versa is 0,7 million passengers for a year, (2) All
of scenarios increase street performance, especially after railway and Sumatera Toll development.
After railway development, value of VCR changes from 0,83 to 0,45 on Simpang Asahan-Simpang
Mesuji D. And the effect of Sumatera Toll development is value of VCR changes from 1,29 to 0,45
on Simpang Terbanggi Besar-Bandar Jaya, (3) Development of street network planning on traffic
network and public transportation, railway, acrossing network, sea network, and air network on
Lampung Province are needed
Cover Belakang Jurnal Rekayasa Edisi Desember 2015
No full textCover Belakang Jurnal Rekayasa Edisi Desember 201
Cover Belakang Jurnal Rekayasa Edisi Agustus 2015
No full textCover Belakang Jurnal Rekayasa Edisi Agustus 201
Analisa Karakteristik Hujan di Kota Bandar Lampung
Full text linkKnowledge of the characteristics of rainfall causes floods and droughts is an important thing. This
research intends to investigate the characteristics of rainfall in the city of Bandar Lampung in or-
der to predict and anticipate events of drought and flood in Bandar Lampung. The data used in
this study is the annual rainfall data obtained from four rainfall stations in Bandar Lampung from
1987 until 2006. The stations that are: Pahoman Station, Sukarame, Sumur Putri, and Kemiling
(Sumber Rejo). The results showed that the pattern and trend of the respective data from each of
the stations the rain is not too different from each other. Most of the stations showed decreased dy -
namically on rainfall. Although this decline did not occur in the rest of the station, but in general
decline is clearly visible when the trend was taken fourth. A dry year, the year in which the annual
precipitation totals less than 90% of the average annual rainfall, dominated after the year 2000.
Most of the rainfall in the year El Nino is below the average annual precipitation. Near Pahoman,
there have been five times the annual rainfall is below average at the time of El Nino (1991, 1992,
1993, 2002, 2004). Near Sukarame, there has been four times the annual rainfall is below aver-
age at the time of El Nino (1991, 1997, 2002, 2004). At the Sumur Putri station, there has been
four times the annual rainfall is below average at the time of El Nino (1991, 1993, 2002, and
2004). Near Kemiling, there has been four times the annual rainfall is below average at the time
of El Nino (1991, 1992, 1997, 2002). This suggests the possibility of EL Nino events are associ-
ated with a decrease in rainfall in each station
STUDI POTENSI SUMBER DAYA AIR UNTUK PEMBANGKIT LISTRIK TENAGA MIKROHIDRO DI PEKON TUGU RATU KECAMATAN SUOH KABUPATEN LAMPUNG BARAT PROPINSI LAMPUNG
Full text linkWater resources in Western Lampung Regency particularly the sub-District Suoh has a lot of po-
tential hydropower, which have not been able to optimally utilized as electrical energy. So that one
of the optimal effort that can be done is by using microhydro energy.
Location of the research is in the Way Sekanda river tributary of the Way Semaka river. Process
analysis using primary data in the form of a cross section of the river cross-section of data and
flow velocity of Way Sekanda, than secondary data from hourly discharge data from the watershed
outlet Way Besai for 11 (eleven) years, the real-time of rainfall in Tugu Ratu village from Septem-
ber 2012 to September 2014 and watershed area derived from Geographic Information System.
Analysis starts from the formation of spatial data maps of Way Semaka watershed, Way Besai wa-
tershed and Way Sekanda watershed using ArcGIS program. Research method includes regional-
ization Way Semaka watershed and Way Besai watershed, estimation the dependable discharge
(Q 80% ) using FDC method, measured discharge calculation of Way Sekanda river, correlation be-
tween discharge FDC method and measured discharge and calculate the electric power which can
be generated.
The formation of the watersheds were done using spatial data analysis and were found
that the area of Way Semaka watershed is 731,0783 km 2 , Way Besai watershed is 415,0393 km 2 ,
Way Sekanda watershed is 1,48 km 2 . Using measured discharge recorded in Way Besai watershed
and the application of regionalization method, the discharge at Way Semaka and Way Sekanda can
be estimated.This is evidenced by the amount of discharge calculated by the method of Flow Dur-
ration Curve is not much different from the magnitude of the discharge measured in the field. Q80
% with FDC method (Flow Duration Curve) to Way Sekanda River is 0,0312 (m 3 /sec), while the
measured discharge in location of Way Sekanda micro hydro power plants (MHP) 0,0314
(m 3 /sec). From the calculation of the electric power in Way Sekanda by using dependable of dis-
charge 50% (Q 50% ) of 0,0592 m 3 /s it is obtained the electricity power with an efficiency of 60 % is
2,7479 kW, while the electric power with an efficiency of 90 % is 4,1219 kW. Therefore Way
Sekanda River is potential for micro hydro power plants (MHP)
PEMODELAN STOKASTIK CURAH HUJAN DARI BEBERAPA STASIUN CURAH HUJAN WILAYAH TANGGAMUS
Full text linkThis research is to study the periodic and stochastic models in the series of daily rainfall data.
The study was conducted using daily rainfall data with a data length of 25 years (1977-2001)
from the station of Banjar Agung, Gisting and Gunung Batu.
This research used secondary rainfall data from Tanggamus, This study change the series of daily
rainfall data into the sepektrum rainfall using FFT (Fast Fourier Transform). Periodicity of daily
rainfall data were presented by using 512 rainfall. Stochastic series of rainfall data are assumed
as the difference (error) between the rainfall data with periodic rainfall model.
Results of this study is the correlation coefficient from three rainfall stations In this study, the
correlation coefficient (R) between the data and the periodic model is 0,9974, between stochastic
data series and stochastic models is 0,9996, and between data and periodic stochastic models is
0,99997. From these results it can be concluded that the periodic stochastic models of
rainfall from Tanggamus periodic models using 512 rainfall data, the approach provides a very
significant