Browsing by Author "Sandhyavitri, Ari"

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    Analisa Perbaikan Sub-Grade Runway Lapangan Terbang Dengan Metode Vertical Drain (Studi Kasus Bandara Tempuling Di Tembilahan, Propinsi Riau)
    (wahyu sari yeni, 2018-09-04) Sandhyavitri, Ari
    Soil stabilization for the runway sub-grade in Tampuling Airport, Tembilahan, Riau province is required as the existing soil is in the grouped of peat or soft soil. The compressibility rate of this soil is very height, with the depth of the soft soil of more than 30 meters from its surface. Based on “the worst case scenario” without any soil stabilization treatment, it was estimated that the soil consolidation rate would be 1.7 metre within 20 years period of settlement. In order to speed up consolidation process, the vertical drain method was applied. Design of pre loading technique as well as the calculation of distance between vertical drains is then demonstrated in this paper. It was estimated that the depth of vertical drain would be 18 metres, with the distance between vertical drains is 1.2 metres each; height of pre loading is 4.5 metres. With these design parameters, it was expected that the settlement process would be accelerated by 40 folds (235 months to become 6 months period).
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    Analisa Tingkat Kerawanan Dan Biaya Resiko Perbaikan Aset Geoteknik Berdasarkan California Rockfall Hazard Rating System
    (wahyu sari yeni, 2018-09-04) Sandhyavitri, Ari
    Inevitably, rockfall and slope failures are continuing occur within cutting slope areas adjacen to road way. This study concerned in investigation of rockfall zones along motorway connecting Provinces of Riau and West Sumatra via Kiliran Jao (246 km). This study utilized California Rockfall Hazard Rating System (CHRS) parameters as a tool to identification of slope hazards. It was identified 66 slopes, of which 10 slopes are considered as risky slopes. Based on the risk cost calculation it was also revealed that 10 slopes were in need to stabilize. The CHRS method put the riskiest slopes as priority to stabilize, but risk cost method considered the lowest risk cost slope to stabilize as a priority. The most preference slope stabilization techniques are slope screening, gabion, and drainage for risky slope at KM 136 and 215.5. The preference one for slope at KM 246 was scalling, retaining wall and drainage
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    The Changes of Land Use Pattern Affect to the Availability of Water Resources in Siak Watershed, Riau Province, Indonesia
    (2018-09-04) Sandhyavitri, Ari; Sutikno, Sigit; Iqbal, Muhammad
    Significant shift in the land use within Siak watershed (DAS Siak) affects to its availability of water resources. This also affected to increase fluctuation level of the river flows. Therefore to develop a comprehensive watershed management strategies, it is required a hydrological model which is in capable to represent the hydrological cycle of the watershed. Hydrological model may use the Soil and Water Assessment Tool (SWAT) application software package. The SWAT simulations performed various scenarios for land use changes in the period of 2002, 2007, and 2012 within the Siak watershed. Based on this research study, the optimal determination coefficient (R2) of SWAT output models were = 0.59, with Nash-Sutcliffe Efficiency (NSE) was 0.58. These results have satisfied the research objectives as the findings coefficient > R2 min (0.4), and NES min (>0.36). The level of water resources availability was calculated by comparing the ratio of Qmax and Qmin of the Siak flow during the period of 2002 to 2012. It was revealed that the ratio of water resources (Qmax/Qmin) were as the following order 10.72 (2002), 6.83 (2007) and 12.95(2012) respectively. Should the ratio value Qmax/Qmin was higher, the more critical the condition of Siak water resources will be. Hence, the changes in land use in the Siak watershed affected to suppress the water resources.
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    Ekstraksi Morfometri Daerah Aliran Sungai (Das) Di Wilayah Kota Pekanbaruuntuk Analisis Hidrograf Satuan Sintetik
    (2016-03-07) Nadia, Fatiha; Fauzi, Manyuk; Sandhyavitri, Ari
    Kajian karakteristik Daerah Aliran Sungai (DAS) di wilayah Provinsi Riau belum banyak diteliti. Kebutuhan akan informasi karakteristik DAS sangat penting guna analisis pengalihragaman hidrograf menjadi debit. Khusus untuk Sungai Siak yang mengalir di wilayah Kota Pekanbaru, memiliki beberapa sub DAS diantaranya sub DAS Sibam, sub DAS Air Hitam, sub DAS Senapelan, sub DAS Sail, sub DAS Tenayan, sub DAS Pendanau. Salah satu cara untuk menganalisis karakteristik sungai menggunakan data Digital Elevaltion Model (DEM). Data DEM dapat diolah menggunakan teknologi Sistem Informasi Geografis (SIG). Ketersediaan data DEM dan Sistem Informasi Geografis digunakan untuk ekstraksi morfometri DAS yang cepat, otomatis dan terintegrasi dengan data DAS lainnya. Data karakteristik DAS dapat digunakan untuk menghitung debit banjir dengan metode hidrograf satuan sintetik. Metode hidrograf satuan sintetik yang sering digunakan di Indonesia yaitu Hidrograf Satuan Sintetik (HSS) Gama I dan Nakayasu. Konsep unit hidrograf satuan dengan nilai kontrol volume/limpasan langsung (HDRO)1 mm digunakan untuk mengetahui metode HSS mana yang sesuai diterapkan pada suatu sub DAS. Pada studi kasus dapat dilihat metode HSS yang bisa diterapkan pada sub DAS Sibam 1,041, sub DAS Air Hitam 1,034, sub DAS Senapelan 1,045, sub DAS Sail 1,011, sub DAS Tenayan 1,019, sub DAS pendanau 1,032 dengan menggunakan metode Nakayasu dengan nilai volume error dibawah 5 % dan nilai HDRO 1 mm
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    Green technology as a strategy in managing the black spots in Siak Highway, Indonesia
    (wahyu sari yeni, 2019-07-01) Sandhyavitri, Ari; Martin, Awaludin
    It was identified that the total traffic accidents in the highway section of Siak, Indonesia within the period of 2011 to 2015 were 1,208 events (2 accidents per 3 days). This accidents figure were considered relatively high and it need to mitigate. The aim of this research are to; (i) analyze the location of Black Spot in the Siak highway, and (ii) drawn a strategy reducing the traffic accidents based on green technology. This study identified that the black spot area was located in the STA 44 + 050 (with a value of the weighted index was 86 and an accident severity rate was 6.21), these values were relatively high. The road horizontal alignment condition at this location was highlighted as a sub-standard high way, consists of low visibility, numerous turning pads, minimum road signs, and minimum road shoulders width. The technical strategy was then drawn as follow; conducting regular road rehabilitation and maintenance, equipping road markings and the street lights as well as road safety facilities based on the green technology such as solar cell traffic lights, solar cell street lights and deploying police statues in reducing traffic accidents within the black spot areas.
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    Identification And Mitigation Of Rockfall Risk Zones
    (wahyu sari yeni, 2018-09-04) Sandhyavitri, Ari
    Rockfall cases are a natural and dynamic geologic process, commonly occur within mountainous areas near by the cliffs undercut by human for developing building or highway infrastructures. These paper objectives were to; (i) identification of slope surface parameters and simulating of rockfall trajectory, (ii) identification of rockfall risk zones, and (iii) mitigation of the rockfall risk zones. Manmade slope in the quarry at the Kloch, Austria was chosen as the case study in this paper. Seven Kloch slope surface parameters were identified, including; dynamic and static friction angles, normal and tangential damping, rolling resistance, amplitude of roughness, and frequency of roughness. Based on the simulation results, it was identified that the rocfall would yield the kinetic energy of 230 kJ, and the bouncing height was 0.5 m. This paper also identified the distance of rock blocks run-out on the flat ground near the slope toe (rockfall risk zones). The rockfall zones were then divided into 3 areas, e.i ; red zone, yellow zone, and green zone or safe area. The distance of red zone was 5.0-12.5 m from the x axis of the slope, yellow one was 12.5-17.5 m, and green one was > 17.5 m. Hence, in order to protect the red and yellow zones from the rockfall risks, it is recommended to construct a barrier located at a distance of 7.0 m form the x axis of the slope, with a minimum height of 1.0 m. The barrier type was proposed as a retaining wall (with a capacity to restrain the rockfall kinetic energy up to 500 kJ).
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    Investigasi Tingkat Kerawanan Lereng Di Ruas Jalan Pekanbaru-Bukittingi Berdasarkan Metode RHRS
    (wahyu sari yeni, 2018-09-04) Sandhyavitri, Ari
    The implementation of Rock fall Hazard Rating System (RHRS) to mapping, evaluating, and analyzing rock fall hazard for road users within the road section of Pekanbaru (Riau Province) – Payakumbuh (West Suatra Province) was discussed in this paper. Twelve major elements of RHRS are subjects to investigate as follow; (i) Slope height, (ii) Ditch effectiveness, (iii) Average vehicle risks, (iv) Percent of Decision Sight Distance, (v) Roadway width Including paved Shoulders, (vi) geological characteristics Discontinuous Joints and Orientation, (vii) Rock Frictions, (viii) differential and erosion features, (ix) erosion rates, (x) climate and present of water, (xi) block size, and (xii) rockfall history. Ten locations prone to rockfall and havinghighest RHRS points were identified, they are: Km 77 ; Km 80 ; 80,2 (kiri) ; Km 80,2 ; Km 80,3 ; Km 81 ; Km 109,3 ; Km 109,5 ; Km 110 ; Km 112. The RHRS values of these 10 rockfall locations were 248 to 581 points. The higher RHRS value of the slope the riskiest the slope to the road users. It is recommended that the priotized slopes should be repaired based on the highest rating of the identified of slope RHRS points.