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PENGEMBANGAN JARING KONTROL GEODESI PEMANTAU WADUK SERMO Waliyanto, Waliyanto; Widjajanti, Nurrohmat; Yulaikhah, Yulaikhah; Taftazani, M. Iqbal
GEOMATIKA Vol 21, No 2 (2015)
Publisher : Badan Informasi Geospasial in Partnership with MAPIN

Keberadaan Waduk Sermo di Kabupaten Kulonprogo, sangat penting karena manfaatnya sebagai tampungan air bersih, sarana pariwisata dan saluran irigasi untuk lahan pertanian di sekitarnya. Namun demikian banyak juga yang tidak menyadari bahwa di bawah Waduk Sermo terdapat segmen sesar aktif yang memanjang dari Parangtritis ke Kulonprogo. Penelitian ini bermaksud untuk mengembangkan jaring pengamatan yang telah ada sebelumnya menjadi lebih luas cakupannya untuk mengetahui dampak dari adanya sesar aktif tersebut. Penelitian dilaksanakan dengan beberapa tahapan, yaitu: 1) pengembangan kerangka kontrol, dengan menambah tujuh titik (5 makro dan 2 mikro) jaring kontrol baru; 2) pengukuran kerangka kontrol, dengan menggunakan pengamatan GPS/GNSS metode relatif statik di semua titik kontrol sejumlah 15 titik; 3) pengolahan data, dengan menggunakan perangkat lunak GAMIT/GLOBK dan diolah dalam dua skenario terkait penggunaan titik referensi dalam pengolahan. Hasil dari penelitian ini adalah terbangunnya pilar/patok jaring pemantauan baru sebagai pengembangan jaring kontrol pemantauan Waduk Sermo, serta koordinat jaring kontrol hasil olahan dalam dua skenario, yaitu: pada skenario pertama, titik makro memiliki simpangan baku terkecil yaitu 0,004 m pada sumbu Z di titik MAK2. Sedangkan pada titik mikro, simpangan baku terkecil sebesar 0,004 m pada sumbu Z di titik BBR1 dan BMS2. Pada skenario kedua, simpangan baku titik makro terkecil yaitu 0,001 m pada sumbu X di titik MAK1. Sedangkan pada titik mikro, simpangan baku terkecil sebesar 0,005 m pada sumbu Z di titik BMS2. Titik-titik yang sudah dibangun dapat bermanfaat untuk memantau pergerakan bendungan dan secara berkala bisa digunakan untuk memantau aktivitas sesar yang berada di bawah Waduk Sermo.Kata kunci: pengembangan JKG, pemantau Waduk Sermo, teknik GPS/GNSS

ESTIMASI KOORDINAT TITIK KONTROL PEMANTAUAN DEFORMASI BENDUNGAN SERMO DENGAN METODE PARAMETER BERTAHAP DARI DATA BASELINE HASIL PENGOLAHAN GAMIT Affriani, Asri Ria; Widjajanti, Nurrohmat; Yulaikhah, Yulaikhah
Jurnal Pendidikan Geografi Gea Vol 19, No 2 (2019)
Publisher : Indonesia University of Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/gea.v19i2.20715

Bendungan Sermo merupakan suatu bangunan struktur yang berfungsi sebagai penampung air untuk air bersih, irigasi pengairan, serta pencegah banjir di Kabupaten Kulon Progo. Oleh karena pentingnya bangunan tersebut, perlu dilakukan pemantauan guna mendeteksi adanya deformasi. Adanya pergerakan geodinamik, perluasan area pemantauan, dan deteksi retakan tanah (crack) memerlukan penambahan jumlah titik kontrol pemantauan deformasi. Penambahan titik kontrol dalam suatu pengukuran dapat mempengaruhi ketelitian hasil pengolahan data sehingga memerlukan strategi khusus pengolahan data. Oleh karena itu, digunakan hitung perataan metode parameter bertahap. Tujuan dari penelitian ini adalah teridentifikasi nilai koordinat 3D dan perbedaan ketelitian titik kontrol pemantaun deformasi yang dihasilkan dari pengolahan dengan metode parameter bertahap serta teridentifikasi signifikansi perbedaan koordinat dan ketelitian hasil pengolahan metode parameter bertahap dengan hasil pengolahan dengan perangkat lunak GAMIT/GLOBK.Penelitian ini menggunakan data pengamatan GNSS 10 titik kontrol pemantauan deformasi Bendungan Sermo yang diukur pada day of year (doy) 250 tahun 2014 selama Â± 2 jam dan doy 129 tahun 2015 Â± 8 jam. Pengolahan data dilakukan dengan perangkat lunak GAMIT untuk mendapatkan panjang baseline dan ketelitiannya dengan pengikatan lokal pada enam stasiun CORS BIG. Nilai panjang baseline dan ketelitiannya digunakan sebagai input dalam pengolahan dengan hitung perataan parameter bertahap sehingga dihasilkan nilai koordinat titik kontrol pemantauan deformasi dan ketelitannya. Pada perataan bertahap tahap pertama digunakan lima titik kontrol dengan satu titik dianggap fixed. Perataan bertahap tahap kedua ditambahkan lima titik kontrol. Analisis yang dilakukan meliputi analisis perbedaan ketelitian pada titik kontrol pemantauan hasil pengolahan data dengan metode parameter bertahap dan perbandingan koordinat 3D hasil pengolahan metode parameter bertahap dengan hasil pengolahan GAMIT/GLOBK.Analisis perbedaan ketelitian hasil pengolahan data menggunakan metode parameter bertahap menunjukkan bahwa terdapat peningkatan ketelitian pada kelima titik kontrol yang diolah pada tahap pertama. Peningkatan ketelitian berkisar antara 0,193 cm s.d. 5,450 cm. Berdasarkan uji perbandingan dua varian sampel, ketelitian hasil pengolahan tahap pertama berbeda signifikan dengan ketelitian hasil pengolahan tahap kedua. Hasil uji signifikansi beda dua parameter menunjukkan bahwa hasil pengolahan koordinat 3D dengan metode perataan bertahap tidak berbeda signifikan dengan hasil pengolahan dengan perangkat lunak GAMIT/GLOBK secara statistik.

Pengaruh Sudut Vertikal Terhadap Hasil Ukuran Jarak dan Beda Tinggi Metode Trigonometris Menggunakan Total Station Nikon DTM 352 Parseno Parseno; Yulaikhah Yulaikhah
Forum Teknik Vol 33, No 3 (2010)
Publisher : Faculty of Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar

The measurement of heigh differences using trigonometric technique, and Total Station NikonDTM 352 is used.It is identified that the use of different vertical angle will produce differentheights for the same point. It is interesting to analyse further that, the errors of distance andheight differences in trigonometric technique are as the function of vertical angle. This researchtries to investigate the phenomenom mentioned above: is there sistimatical error? and how tocorect them ?This research is initially arranged to include some steps: (1) preparation of instruments, (2)measurement of distance and height differences in study area using spirit levelling andtrigonometric levelling, (3) Data processing including correction of differences in heightmodelling. Evaluation was carried out by comparing both data of observed height differences.Based on the result of the statistical test, it is found that the variety of vertical angles do notaffect the computed distance and height differences using Total Station. From the data exercisesresulted that the accuracy of height differences is affected by distance and vertical angle,however for the distance up to 800 m, the improvement is not signifcant. In addition the fieldobservations also show that the distance greater than 50m , the contribution of the accuracy ofangle to the change of the accuracy of height differences is greater than the contribution of theaccuracy of the distances.Keywords: height differences,trigonometric levelling, trigonometric technique, Total Station.

The Effect of Baseline Component Correlation on the Design of GNSS Network Configuration for Sermo Reservoir Deformation Monitoring Yulaikhah Yulaikhah; Subagyo Pramumijoyo; Nurrohmat Widjajanti
Indonesian Journal of Geography Vol 51, No 2 (2019): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

The condition of the geological structure in the surrounding Sermo reservoir shows that there is a fault crossing the reservoir. Deformation monitoring of that fault has been carried out by conducting GNSS campaigns at 15 monitoring stations simultaneously. However, those campaigns were not well designed. With such a design, it took many instruments and spent much money. For the next GNSS campaign, it should be designed so that the optimal network configuration is obtained and the cost can be reduced. In the design of deformation monitoring network, sensitivity criteria become very important for detecting the deformations. In GNSS relative positioning, the baseline components are correlated, but this correlation is often ignored. This research examined the effect of baseline component correlations on the design results of the GNSS configuration of the Sermo Fault network based on sensitivity criterion. In this case, the western side of the fault was taken as a reference, while the other side as an object moving relatively against the western side. This study found that the baseline component correlation affects the results of GNSS network configuration. Considering the correlation could result a sensitive network configuration with a fewer baseline; therefore, the cost and time of field surveys can be reduced. It can be said that the baseline component correlation needs to be taken into account in the configuration design of deformation monitoring network.

Studi Akurasi Pengukuran GNSS Jaring Makro Tahun 2016 dan 2017 pada Pemantauan Bendungan Sermo Muhammad Iqbal Taftazani; Yulaikhah Yulaikhah
Jurnal Nasional Teknologi Terapan (JNTT) Vol 1, No 1 (2017): NOVEMBER
Publisher : Penelitian dan Pengabdian Kepada Masyarakat Sekolah Vokasi Universitas Gadjah Mada

Monitoring of deformation on Sermo Dam has been widely practiced. One of them is by installing the monitoring point, locate dinside the Sermo Dam area called the micro network, and outside the dam called macro network. The installation of the micro network monitoring point aims to monitor the deformation of the dam due to the volume of water. The macro network monitoring point aims to monitor the effect of the existence of an active fault under the dam. In the last few years, monitoring in Sermo Dam has been done using GNSS technology. This paper intends to present the results of the accuracy represented by the deviation standard value of the measurement point at the macro net on the GNSS observation in 2016 and 2017. The objective is to compare the accuracy resulting from various GNSS processing strategies in observation 2016 and 2017, evaluation of GNSS measurements that can be used as guidance in subsequent GNSS measurements. The result shows that GNSS measurement in 2017 using two IGS reference points (BAKO and COCO) has a better standard deviation value compared to the 2016 measurement by the difference 1-5 mm on the X axis, 1-9 mm on the Y axis, and 1-2 mm on the Z axis. In the GNSS data processing using seven IGS reference points (BAKO, COCO, KARR, DARW, GUUG, PIMO, SHAO) in 2016 mostly has a better standard deviation compared to 2017 measurement except in MAK5 with the difference 0-4 mm on the X axis, 1-10 mm on Y axis, and 0-2 mm on Z axis. As for the value of coordinate data processing in 2016 and 2017on the two processing strategies there are differences in coordinate values that indicate the movement of monitoring points of macro network. However, the vector of the point movement that occurs in the two strategies has a different direction. This requires verification in-depth research and focused on the deformation of the Sermo Dam monitoring point.

Correlation of GNSS Observation Data Quality Resulted from TEQC Checking and Coordinate’s Precision Yulaikhah Yulaikhah; Subagyo Pramumijoyo; Nurrohmat Widjajanti
Jurnal Geospasial Indonesia Vol 1, No 1 (2018): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.38387

GPS Positioning provides good coordinate accuracy that is up to a millimeter. However, some error sources such as multipath, atmospheric conditions and obstruction can reduce the quality of data and also coordinates. To minimize errors due to these factors, at the time of determining the station location, it is necessary to pay attention to the surrounding conditions, namely by looking for open areas and avoiding objects that can reflect GNSS signals. However, it is often not easy to find the ideal observation station location, which forms a good chain while being free from obstruction and multipath. Therefore, it is often necessary to prioritize certain factors over other factors. Information about the correlation between multipath, ionospheric conditions and the recording level of observational data on coordinate accuracy can be used as consideration in determining the location of control points for deformation monitoring and determining which factors are prioritized. This study aims to evaluate the correlation between data quality and coordinates precision.The used observation data are Sermo Reservoir control network and nine CORS BIG stations. The component data analyzed are multipath (MP1, MP2), ionospheric effects (IOD slips and IOD or MP slips) and the data recording level (obs). These components were resulted by checking with TEQC software, while the precision of the coordinates was obtained by processing with GAMIT / GLOBK software. Based on the correlation coefficient value, it is known that the recording level of observation data has the strongest correlation with a negative direction (ranging from -0.7 to -0.9). It is the ratio between the number of real observations to the number of possible ones. One factor that influences it is the obstruction in the field. In other words, in determining the location of GNSS observation stations, the conditions of obstruction in the vicinity need to be considered and prioritized.

Time Variant Adjustment for The Solution of Control Point Unstability in Deformation Analysis of Borobudur Vertical Deformation Monitoring Network Dwi Lestari; Yulaikhah Yulaikhah; Rizki Iman Sari
Jurnal Geospasial Indonesia Vol 1, No 1 (2018): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.38590

Borobudur is Indonesian's cultural heritage which is recognized as a world heritage by UNESCO. As a world heritage structure, monitoring and maintenance have to be carried out periodically at Borobudur. Monitoring the vertical deformation of the temple using Geodetic method is one kind of monitoring which have to be done, in this case the monitoring uses leveling network. The design of leveling network at Borobudur in 2002 used absolute network, but the control point of this network has been indicated to be shifted. The control point displacement would cause a systematic error in the adjustment computation method for the analysis of vertical displacement. The correction of control point elevation due to the vertical shift is needed prior to the adjustment computation using observation model. In addition, there is a time variant adjustment computation method which able to calculate the vertical rate of object point displacement. This study aims to compare the vertical displacement analysis of the Borobudur’s vertical network from the adjustment computation using observation model with the correction of control point height and from time-variant adjustment method.Data used in this study were the elevation differences from leveling measurements in 2002, 2003 and 2004, and the elevation and vertical velocity of the control point in 2002. Adjustment computation using observation model began with the elevation correction of control point at each epoch. The adjustment computation was taken to determine the elevation of monitoring points at each epoch. Statistical test and vertical displacement analysis using significance parameter tests was carried out to analyze the results. Adjustment computation using time-variant method was taken to determine the elevation and the vertical velocity of the monitoring points at certain epoch intervals and validated using global test after the adjustment computation.The vertical displacement magnitude of Borobudur’s monitoring points, resulted from the parameter adjustment computation with the correction of control point compared to the time-variant adjustment results was differed in nanometer. Time-variant adjustment computation method gave more accurates result of 1.5 times better than the observation model.

Development and Definition of Prambanan Temple Deformation Monitoring Control Points Rochmad Muryamto; Muhammad Iqbal Taftazani; Yulaikhah Yulaikhah; Bambang Kun Cahyono; Anindya Sricandra Prasidya
Jurnal Geospasial Indonesia Vol 1, No 2 (2018): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.40788

Since 1991, Prambanan Temple has been recognized by UNESCO as a cultural heritage of a historic building. In its construction, the Prambanan temple was established in a labile soil structure in the sandy soil and not far from the Opak River. In the geological map of Yogyakarta, there is a fault under the Opak River landscape. This fault under the Opak River has caused an earthquake in 2006. Because of its position in disaster-prone areas, regular monitoring of the geometric aspects of Prambanan Temple is very necessary.This research aims to build a deformation monitoring control point in Prambanan Temple. Eight control points, consist of three existing points and five new points are built around Prambanan Temple. These eight control points then were measured by observing GNSS for 1x24 hours in order to define their coordinates. GNSS data processing is done using GAMIT 10.70 software with two strategies, namely (1) processing with regional binding points, in this case using IGS BAKO and JOG2 stations, and (2) processing with global binding points using IGS COCO station reference points, DARW, KARR, POHN, PIMO, DGAR, and IISC. This research yields the establishment of Prambanan temple deformation control points and their coordinates and standard deviation in two processing strategies. The smallest standard deviation in the first strategy is 0.0787 m on the Z-axis for points of PRO1 and PR03. The biggest standard deviation is 0.1218 m on the Y-axis at point of PR02. In the second strategy the smallest standard deviation is 0.0036 m on the Z-axis for points of PR01 and PR03. The biggest standard is 0.0141 m on the Y-axis at point of PR02.

Determination of Boiler Building Verticality in Power Plant Construction using Terrestrial Laser Scanner (TLS) Mohamad Bagas Setiawan; Yulaikhah Yulaikhah; Ruli Andaru
Jurnal Geospasial Indonesia Vol 2, No 1 (2019): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.40846

Nowadays, Indonesian government is focusing on build up infrastructures, especially power plant infrastructures to fulfil electrical energy needs. One of the power plants that will be built up is Waai power plant which located on Waai village, Maluku Province. Waai power plant had been postponed since 2014. In order to build this power plant, the advisability of the building needed to be checked from its verticality level. This level was determined by Terrestrial Laser Scanner (TLS). The TLS’s point clouds were registered using two methods, there are target to target and cloud to cloud methods. There are 65 beams on the power plant boiler building, but only 31 beams that used as the samples to assign the verticality of the boiler construction. The verticality level was set on the X-axis, Y-axis, and the resultant of the X and Y axis by using Pythagoras theorem after the bottom and top coordinates from each beam was determined. The Queensland Building and Construction Admission Standards and Tolerances Guide 2016 was used as tolerance of verticality level. The result of the verticality calculation presented on the X-axis consisted from -0ᵒ 1’ 26,678” to 0ᵒ 4’ 11,778” with the average was 0ᵒ 1’ 40,820” and major direction pointed the positive axis. On the Y-axis, the average was -0ᵒ 0’ 45,772” with -0ᵒ 3’ 33,345” as minimum and 0ᵒ 1’ 25,319” as the maximum and the major direction went to the negative axis. The verticality on the resultant of X and Y axis was from 0ᵒ 0’ 45,225” until 0ᵒ 4’ 15,674” with the average was 0ᵒ 2’ 27,057” and the direction was to the southeast. After the verticality number was compared with the tolerance, the verticality level was smaller than the standard on each beam. From the result, we can conclude that the boiler building on the Waai power plant can be categorized safe to reconstruct.

Calculation Of Sedimentation Rate at Sempor Reservoirs in 2018 Using Modified Universal Soil Loss Equation Method (MUSLE) Septi Arini; Yulaikhah Yulaikhah; Bambang Kun Cahyono
Jurnal Geospasial Indonesia Vol 2, No 2 (2019): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jgise.51156

Sempor Reservoir located in the Telomoyo River Basin in the Serayu River region is categorized as one of the priority watersheds based on the 2015-2019 Strategic Plan of the Ministry of Environment and Forestry. Priority watershed is a watershed that gets more attention in controlling water pollution, one of which is sedimentation. Watershed observation and management activities are needed for the reservoir to operate optimally. One of the observations and management activities of the Sempor Watershed is the calculation of sedimentation rate. In this research the sedimentation rate was calculated using the MUSLE method that included runoff parameter, erodibility, slope, land cover and conservation factor. The Sempor watershed boundary is obtained through delineation of DEM. The calculation is done by utilizing a Geographic Information System (GIS) through analysis of soil type maps, length and slope maps, land cover and conservation maps with the boundaries of the Sempor Reservoir. Based on this result, the Sempor Reservoir has a sedimentation rate of 166,173,500 tons/year and a sedimentation thickness rate of 3,7259 mm/year. According to the provisions of the Ministry of Forestry in 2009, the rate of sedimentation thickness in the Sempor Reservoir is included in the medium class. The river as one of the potential means of sediment transport contributes to the rate of sediment thickness of 3.7256 mm /year, while for areas outside the river coverage it only 0.003 mm/year. The river has a major influence on sedimentation in the Sempor Reservoir.

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