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Uniqueness Deposit of Sediment on Floodplain Resulting From Lateral Accretion on Tropical Area : Study Case at Kampar River, Indonesia Yuskar, Yuniarti; Choanji, Tiggi
Journal of Geoscience, Engineering, Environment, and Technology Vol 2 No 1 (2017): JGEET Vol 02 No 01 : March (2017)
Publisher : UIR PRESS

Kampar rivers has a length of 413 km with average depth of 7.7 m and width of 143 m. Sixty percent of  this rivers are meandering fluvial system which transport and deposit a mixture of suspended and bed-load (mixed load) along low energy. River channel that moving sideways by erosion is undergoing lateral migration and the top of the point bar becomes the edge of the floodplain and the fining-upward succession of the point bar will be capped by overbank deposits of Kampar River. Along the Kampar Rivers, there are more than 60% of ï¬oodplain sediments and almost all of the ï¬oodplain formed by bend migration on the suspended-load channels of Kampar watershed. This formation consist of succession of fine to medium sand and silt/mud, with root traces, that form as drapes on the prograding bank. These beds dip mostly channel wards and quickly wedge out as they grade up and onto the ï¬oodplain. The depositional model is presented showing how lateral accretion can make a signiï¬cant contribution to the preservation of ï¬ne-grained within channel deposits in contemporary ï¬oodplains. The examples presented here demonstrate that analogues to ancient point-bar deposits containing alternating sandstone and shale sequences are common in the low-energy ï¬uvial environments of Riau rivers especially Kampar rivers.

Geo-tourism Potential of Sand Bars and Oxbow lake at Buluh Cina, Kampar â Riau, Indonesia Yuskar, Yuniarti
Journal of Geoscience, Engineering, Environment, and Technology Vol 1 No 1 (2016): JGEET Vol 01 No 01 : December (2016)
Publisher : UIR PRESS

Buluh Cina Village is located at Siak Hulu District, Kampar Regency, Riau Province and its about 25 km from Pekanbaru City. This Village is designated as Tourism Village by The Government of Riau Province. This research aims to optimize the potential Geo-tourism by understanding the strengths and weaknesses aspect which is owned by Buluh China Village. So it can increase the number of tourists who visit Buluh Cina Village. The method used is the field survey and literature review. The village is surrounded by a tropical rain forest with an area of over 100 hectares and it divided by the Kampar Kanan River. Fluvial Meandering System of this river form the main channel (river), sandbars, natural levee, floodplain and oxbow lake. Geo-tourism potential that can be developed are sand bars and oxbow lake. Buluh China Village has had a tourist attraction, but there are still some weaknesses, such as floods in the rainy season and some support facilities are not optimal.

Interpretasi Fasies Pengendapan Formasi Tondo, Pulau Buton, Sulawesi Tenggara Berdasarkan Data Pemetaan Geologi dan Potensinya Sebagai Batuan Reservoir Minyakbumi Yuskar, Yuniarti
JOURNAL OF EARTH ENERGY ENGINEERING Vol 3 No 1 (2014): APRIL
Publisher : UIR PRESS

Daerah penelitian berada di Pulau Buton Provinsi Sulawesi Tenggara. Fokus penelitian pada bagian selatan Pulau Buton yaitu daerah Gonda dan Sekitarnya. Secara geografis terletak antara 122Â° 42â 28ââ BT - 122Â° 48â 00ââ BT dan 5Â° 25â 28â LS - 05Â° 25â 28â LS. Penelitian ini bertujuan mengetahui stratigrafi dan fasies pengendapan pada Formasi Tondo. Formasi Tondo menarik untuk dipelajari karena merupakan reservoir utama pada Cekungan Buton. Metodologi yang digunakan yaitu penelitian lapangan dengan mengambil conto batuan yang kemudian dilakukan analisis laboratorium mikropaleontologi dan laboratorium petrografi. Selain itu digunakan juga data-data dari peneliti terdahulu sebagai penunjang dalam interpretasi geologi. Formasi Tondo pada daerah penelitian setara dengan Satuan batupasir kerikilan. Satuan ini tersusun oleh batupasir kerikilan, batupasir sisipan batulempung dan konglomerat yang didominasi oleh batupasir kerikilan. Umur Satuan ini berdasarkan analisis laboratorium mikropaleontologi yaitu berumur Miosen Akhir (N17 â N18). Formasi Tondo merupakan reservoi utama di daerah Buton memiliki porositas yang baik sekitar 8 hingga 25% dengan rata-rata 10% dan maksimum permeabilitas 172mD. Sistem pengendapan pada batupasir kerikilan ini merupakan sistem pengendapan tuirbidit terlihat dari adanya campuran butiran kasar dan halus serta dipengaruhi oleh lingkungan laut terlihat dari batuan yang bersifat karbonatan. Batupasir kerikilan sampai konglomerat merupakan hasil pengendapan channel dilaut dalam.

Karstifikasi dan Pola Struktur Kuarter Berdasarkan Pemetaan Lapangan dan Citra SRTM Pada Formasi Wapulaka, Pasar Wajo, Buton, Sulawesi Tenggara. Yuskar, Yuniarti; Choanji, Tiggi; Buburanda, Harisma
JOURNAL OF EARTH ENERGY ENGINEERING Vol 6 No 1 (2017): APRIL
Publisher : UIR PRESS

Karstification process occurs as a result of dissolution on limestone lithology formed in typical morphology of caves, rounded or elongated pits and conical hills. This also related with structural pattern that also intesively occurs at western part of Buton Island. Research area located at lattitude 5027â0â S â 5032â0ââ S and longitude 122049â30â E - 122052â30â E. Purpose of this research was to identified karst landscape and karstificatiom process on Wapulaka Formation and recognize the structural pattern on this formation. By using field observation and SRTM data interpretation we considered that karst formations formed on Wapulaka Formation was Quarter limestone which diagenesis process of dissolution forming karst landform also related with uplifted event at pliocene â pleistocene.  This formed related with complex interaction between the geology, climate, hydrology and biological factors that created various landscape morphology such as caves, underground river, stalagtite, stalagmite and others cave ornament.

Hydrochemistry and Characteristics of Groundwater: Case Study Water Contamination at Citarum River Upstream Hadian, Mohamad Sapari Dwi; Waliana, T Yan; Sulaksana, Nana; Putra, Dewandra Bagus Eka; Yuskar, Yuniarti
Journal of Geoscience, Engineering, Environment, and Technology Vol 2 No 4 (2017): JGEET Vol 02 No 04 : December (2017)
Publisher : UIR PRESS

Rancaekek and Sayang area, West Java, are the area where many industrial factories are located.Thus, the region becomes the targeted destination for industrial development.The  population in the area is rising due to the growth of industries causing the regional development becomes uncontrollable. In addition, the constant increment of waste and also poor-coordinated disposal systems may result in groundwater contamination in the areas. The rapid growth of the area increase the need for groundwater as well as the need for more research about contamination at Rancaekek and Sayang. The research aims to explore the spread of groundwater contamination in the area. The research method is carried out based on the analysis of Geological Mapping, Hydrogeological Mapping and chemical characteristics of the groundwater in the area. Chemical analyses of the groundwater were conducted through laboratory test of groundwater samples at specific spots of dug wells. The lab test results were further analyzed to determine the contamination zone. The findings reveal that the distribution of contamination in the area follow the shallow ground water flow patterns, the water contamination contains heavy metal and there is degradation of soil fertility. The findings suggest the stakeholders to delineate the contaminated area, and increase the dissemination of environmental awareness.

Structural Geology Analysis In A Disaster-Prone Of Slope Failure, Merangin Village, Kuok District, Kampar Regency, Riau Province Yuskar, Yuniarti; Putra, Dewandra Bagus Eka; Suryadi, Adi; Choanji, Tiggi; Cahyaningsih, Catur
Journal of Geoscience, Engineering, Environment, and Technology Vol 2 No 4 (2017): JGEET Vol 02 No 04 : December (2017)
Publisher : UIR PRESS

The geological disaster of landslide has occurred in Merangin Village, Kuok Subdistrict, Kampar Regency, Riau Province which located exactly in the national road of Riau - West Sumatra at Km 91. Based on the occurrence of landslide, this research was conducted to study geological structure and engineering geology to determine the main factors causing landslides. Based on measurement of the structural geology found on research area,  there were fractures, faults and fold rocks which having trend of stress N 2380 E,  plunge 60, trending NE-SW direction. Several faults that found was normal faults directing N 2000 E with dip 200 trending from northeast-southwest and reverse fault impinging N 550 E with dip 550, pitch 200 trending to the northeast. Fold structures showing azimuth N 2010 E trending southeast-northwest. From geological engineering analysis, the results of scan line at 6 sites that have RQD value ranges 9.4% - 78.7 % with discontinuity spacing 4 - 20 cm. So,  It can be concluded that the formed structure was influenced by the extensive northeast-southwest tectonic phase, then continued through north-south tectonic phase, and ended by a tectonic period with directing from northeast-southwest. Rock Mass Rating classification showing value 62 – 76,  Which also resulted that rocks in the study area have weathered on the outside but still in good condition (good rock). However, This condition of structure has caused the formation rocks producing weak zone that became one cause of the occurrence of landslides.

Petrography, Geology Structure and Landslide Characterization of Sumatra Fault Deformation: Study Case In Km 10-15 Highway, Koto Baru Sub District, West of Sumatra Cahyaningsih, Catur; Crensonni, Puja Fransismik; Aditia, Yogi; Suryadi, Adi; Yuskar, Yuniarti; Choanji, Tiggi; Putra, Dewandra Bagus Eka
Journal of Geoscience, Engineering, Environment, and Technology Vol 3 No 4 (2018): JGEET Vol 03 No 04 : December (2018)
Publisher : UIR PRESS

Research area is around Tanjung Balik, Koto Baru Sub Base, Lima Puluh Kota District, West Sumatra Province. Located along the highway Km 10-15 Riau – West Sumatra and the coordinate around 00˚08'40 '' LU - 0˚11'20 '' N and 100˚45'20 '' BT - 100˚47'00 '' BT. The purpose of research to identify petrography, microstructure, types of landslides and the geological condition. The methods using polarization microscope, stereography, landslide identification survey and geological mapping. The result of study shows the petrography analysis of lithology of study area are classified into three types of rocks are Feldspathic Greywacke, Lithic Arenite, and Slate. Microstructures trending system show the foliation structure that is relatively Southeast-Northwest. Types of landslide which dominates in the research area are debris avalanche and translational landslide. Geological analysis show some of rock units are classified into two units: Sandstone Unit and Slate Unit. Sandstone Unit spread in the northern part of the study area, while Slate Unit spread in the southern part of the study area. The characteristics of these rocks showed Pematang Formation.

Quarternary Sediment Characteristics of Floodplain area: Study Case at Kampar River, Rumbio Area and Surroundings, Riau Province Yuskar, Yuniarti; Putra, Dewandra Bagus Eka; Revanda, Muhammad
Journal of Geoscience, Engineering, Environment, and Technology Vol 3 No 1 (2018): JGEET Vol 03 No 01 : March (2018)
Publisher : UIR PRESS

The study area is located in some floodplains of meandering river environment along the Kampar River, Rumbio. Typical morphology of meandering river that found in this area can be classified as stream channel, floodplain, abandoned channel, and sand bars deposit. Meandering river system carries sediment supply by suspended and bed - load (mixed load) in conjunction with low energy into a particular characteristic on sediment deposition. This study aims to determine the characteristics of the sediments, changes in vertical and lateral spread of sediment deposition on the floodplain environment. This study conducted by field survey using a hand auger of 1.5m - 4m depth and trenching which is a layer that has been exposed of 1-2 meters depth. Further analysis had been carried out using granulometri method and core data analysis to determine the characteristics and depositional facies. Sediment deposit that formed along the Kampar River is the result of the main channel migration of Kampar River. The characteristic of quaternary sediment facies is coarse to gravelly sand on the bottom followed by fine to very fine sand with pattern fining upwards and silt to clay and abundant terrestrial organic matter at the uppermost layer. Depositional facies are determined based on the characteristics of sediment facies which can be grouped into a stream channel, oblique accretion deposits, sand bars and overbank deposits.

Saltwater Intrusion Zone Mapping on Shallow Groundwater Aquifer in Selat Baru, Bengkalis Island, Indonesia Putra, Dewandra Bagus Eka; Yuskar, Yuniarti; Kausarian, Husnul; Wan Yaacob, Wan Zuhairi; Hadian, Mohamad Sapari Dwi
Journal of Geoscience, Engineering, Environment, and Technology Vol 4 No 1 (2019): JGEET Vol 04 No 01 : March (2019)
Publisher : UIR PRESS

Saltwater intrusion becomes a common problem in coastal area. Northern coast of Bengkalis Island in Riau, Indonesia that contiguously to Malacca Strait is experiencing the problem particularly in Selat Baru area which considered as developing area and most of the people live close to the sea. Dug well is the main source of groundwater that had been used by the population in Selat Baru and as the increasing of land occupation, the demand of clean water is rising up followed by the number of dug well. A study of groundwater monitoring was conducted to identify the zone of saltwater intrusion. Field observation had done by measuring the water level and physical parameters of groundwater such as taste, pH, electrical conductivity (EC) and total dissolved solid (TDS) from 110 existing dug wells. Some conus feature had found from groundwater elevation map which indicated lower water level caused by excessive groundwater pumping. Generally, pH shows values from 6-8 that was still in range of water quality standard, but there are 20 wells (18%) that have pH below the water quality standard (slightly acidic water). Similar pattern had been observed from Electrical Conductivity (EC) and Total Dissolved Solid (TDS) map, higher value of EC and TDS was dominant in the northern part of study area and lower value in the south. Groundwater taste map also revealed the identical condition with EC and TDS map which dominated by brackish and saline water in the northern part. Therefore, the study area had been divided into two zones of groundwater saline water zone possibly caused by the saltwater intrusion in the northern part and freshwater zone from the center to the southern part.

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