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Evi Aprianti
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International Association of Lowland Technology In Collaboration with Hasanuddin University and Saga University Address Faculty of Engineering, Center of Technology Building, 1st Floor Jalan Poros Malino km. 6, Bontomarannu, Gowa Indonesia Postal Code: 91711
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Lowland Technology International
Published by International Association of Lowland Technology
ISSN : 13449656     EISSN : 21878870     DOI : https://doi.org/10.0001/ialt_lti
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Engineering Transportation
The Lowland Technology International Journal presents activity and research developments in Geotechnical Engineering, Water Resources Engineering, Structural Engineering, Transportation Engineering, Urban Planning, Coastal Engineering, Disaster Prevention and Mitigation Engineering.
Arjuna Subject : Teknik (semua kategori) - Teknik Sipil dan Struktur
Articles 8 Documents
 1 
Search results for , issue "Vol 21 No 1, June (2019)" : 8 Documents clear
Application drought indexes to calculate the drought frequency: Case Study in the Center of Vietnam D. D. Truong; D. Q. Tri; T. T. Dat; L. T. T. Ha
Lowland Technology International Vol 21 No 1, June (2019)
Publisher : International Association of Lowland Technology

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Abstract

In this paper, we used observation data of rainfall from 1981 to 2016 and average temperature to calculate drought indices: J, Ped, and SPI for the center region of Vietnam. The first advantage of three indicators is that they were based on meteorological variables such as rainfall and average temperature data. The second advantage is that it is possible to estimate the value each month, contributing to the examination of the drought details in a specific period. These indicators easily classify the degree of drought from no drought, normal to moderate and extreme drought. In this study, it is shown that when determined according to the J index, drought is more clearly delineated according to the level of drought. In addition, the J index reflects a significant level of seasonal drought. The result of drought frequency map shows that the extreme drought occurs in the two provinces of Hoi Xuan in Thanh Hoa and Quy Nhon in Binh Dinh. Through the J index, the study also statistically detailed the level of drought for some typical stations in the Central region of Vietnam.
Modeling for Analyzing Effects of Groundwater Pumping in Can Tho city, Vietnam N.D.G. Nam; A. Goto; K. Osawa; N.V.C. Ngan
Lowland Technology International Vol 21 No 1, June (2019)
Publisher : International Association of Lowland Technology

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Abstract

In this study, the steady-state groundwater model in the study area, Can Tho city, a capital of Mekong Delta, was developed. To construct the numerical groundwater model for the Can Tho city, the concept and model boundary were set by hydrological data (model layers), digital elevation map (drainage and surface) and Mekong Delta region groundwater model results (groundwater head boundary). Investigation and compilation of data for the model input such as aquifer properties, hydraulic parameters and meteorological data were conducted and initially assigned to the model for a grid cell. The calibrated model successfully simulated groundwater heads comparing with observation heads at 14 monitoring wells. Simulation of spatial groundwater heads distribution of the aquifer includes groundwater pumping stations for domestic and industry was conducted as expected from the conceptual model. Its results clarified groundwater drawdown areas in the city. Impact zones of groundwater pumping are also addressed and known as vulnerable zones to land subsidence. Finally, to understand the effects of projected increased demands on groundwater for water supply, the model was used to predict the groundwater decline based on the trend of increased pumping until 2035. The formation process of cones of depression under current and increased pumping operation was also modeled in 3D to evaluate the impacts of dense distribution of pumping wells on groundwater resources in the Can Tho city.
Modification of Sidoardo Lava Mud (“LUSI”) to Become Granular Material for Quality Fill Materials D. Pasmar; N.E. Mochtar
Lowland Technology International Vol 21 No 1, June (2019)
Publisher : International Association of Lowland Technology

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Abstract

The term LuSi is abbreviation of Lumpur Sidoarjo, which is a certain type of hot lava mud coming out from the earth in Sidoarjo, East Java, Indonesia. The hot lava mud initially was outflowing at the rate about 100.000m3/day and the flow peaked around 125.000m3/day in 2007, but then gradually decreasing to become 20.000m3/day up to now. LuSi contains of 88% fine materials with LL=81.58% and PI=49.56%; it is classified as CH or A-7-6. To reduce the volume of LuSi, it is planned to use as quality fill materials; it means that LuSi has to meet the fill material requirement. For this purpose, 10% of lime Ca(OH)2 used as stabilization material and granulation process adopted to modify its particle size. The new material produced is non-plastic material called as granular lime-stabilized LuSi (SGL); its grain size is affected by rotation speed of granulator drum (V) during the granulation process. If SGL is compacted using compaction energy 90% of the maximum dry density (MDD), the minimum values of soaked CBR obtained are 7%, 12%, and 13% for V=6rpm, 8rpm, and 10rpm, respectively. It shows that SGL can be used at least as “regular fill material” because its minimum soaked CBR>6%.
Environmental risk assessment and protection measures due to dewatering during construction of Wangfuzhuang Metro Station, Jinan, China G. Li; B. Hu; L. Lu; J. Chen
Lowland Technology International Vol 21 No 1, June (2019)
Publisher : International Association of Lowland Technology

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Abstract

Jinan is famous due to its spring group with rich groundwater resources. The groundwater system should be protected during the construction of the metro system. This paper presents a case study of the environmental risk assessment due to dewatering and recharges during the construction of Wangfuzhuang Metro Station, Jinan, China. The Fuzzy Analytic Hierarchy Process (FAHP) is employed to evaluate the impact on the environment. Moreover, based on Darcy’s law, and water inflow calculations for a submersible full well and water level line equation under the coupling action of a submersible full dewatering-recharge well group, the dewatering and recharge schemes of the deep foundation pit excavation are designed. Both results from numerical simulation and site survey show that dewatering and recharging at the Jinan R1 line site were effective in environmental protection.
Adaptation of Ohia Pozzolan on Cemented Lateritic Soil as Base Material Improvement K.C. Onyelowe
Lowland Technology International Vol 21 No 1, June (2019)
Publisher : International Association of Lowland Technology

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Abstract

The effect of nanostructured Ohia naturally occurring pozzolan (kaolin clay) on the compressive strength of Umuntu Olokoro lateritic soil was investigated for use as base material improvement of south eastern roads. First, a preliminary exercise was conducted to determine the index, grading and consistency properties of the natural soil. The results show that the Umuntu Olokoro soil was an A-2-7 soil, according to AASHTO classification system and poorly graded (GP) on USCS classification. The soil also recorded a PI of 21.85%, which shows that the soil was highly plastic. The specific gravity of the soil was 2.67, OMC of 13%, Maximum Dry Density of 1.84 gm/cm3, California Bearing Ratio of 14%, Unconfined Compressive Strength of 194.26 kN/m2, 219.11 kN/m2 and 230.77 kN/m2 at 7, 14 and 28 days curing periods with material property of silty clayey sand and stiff material. Furthermore, the pozzolan additive was introduced in proportions of 3%, 6%, 9%, 12% and 15% by weight and the effect of the varying proportions studied. The results show that the introduction of the pozzolan improved the soil compressive strength, considerable and a maximum of 369.9 kN/m2 was achieved at 9% proportion of pozzolan at 28 days curing time. Having satisfied the material properties for use as a base material (200-400kN/m2), pozzolan is a very good admixture material in the stabilization of lateritic soils for use as a subbase material for pavement construction.
Combining Soil Nail and Vetiver Grass In A Slope Protection Project In Vietnam N. T. Nghia; L. G. Lam; T. Hino
Lowland Technology International Vol 21 No 1, June (2019)
Publisher : International Association of Lowland Technology

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Abstract

This paper presents a combination of soil nail and vetiver grass for slope protection in a project in center of Vietnam. The application of vetiver grass is considered as a green environmental solution for erosion surface control while soil nail with shotcrete is a traditional method for steep slope stabilization. The shotcrete surface of soil nail system will be replaced by vetiver grass for the combination of soil nail and vetiver grass. This is not only economic solution but also meets requirement for landscaping. This paper presents design and construction techniques and compares the construction cost with tradiional soil nail methods.
Perception evaluation of soundscape in a wetland community by spatial graphical representation: a case study of Hangzhou Xixi Wetland, China. J.R. Shi; Y. Yang; D.S. Wang; H. Liu; X.M. Zhao
Lowland Technology International Vol 21 No 1, June (2019)
Publisher : International Association of Lowland Technology

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Abstract

The perception evaluation of soundscape in a wetland community is investigated based on spatial graphical representation and statistical theory. The data were analyzed by EXCEL and SPSS and they produced the zoning map of soundscape in a wetland park. XIXI Wetland,Hangzhou, China, was chosen as the case area. The perception evaluation of soundscape was conducted at ten aspects: elements, time, preference, integration, liveliness, boisterousness, pleasure, feature, nature and irritability. Meanwhile, the goal is to provide a favorite soundscape for tourists, and a visual map with graphic reference is drawn for soundscape design in the wetland community.
Research trends on land use changes during 1991–2015: A Bibliometric Analysis J. Zhang; B. Wang; X. Chen; X. Wu; D. Zhang
Lowland Technology International Vol 21 No 1, June (2019)
Publisher : International Association of Lowland Technology

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Abstract

Land use changes, as a practical and advanced space exploration technology, offered a lot of valuable data about the earth surface for global analysis, detailed assessment, environmental monitoring, mapping, change detection, disaster management, and civil and military intelligence. To provide a better understanding of global trends in land use changes research over the past 25 years and offer an informed perspective on future research, a bibliometric analysis of published land use changes research was conducted to evaluate current research trends from various perspectives quantitatively and qualitatively for the period of 1991-2015 based on SCIE&SSCI databases. This study is concentrated on the analysis of scientific outputs, research directions, source journals, author performance and their contribution, the distribution of research countries/territories as well as institutions and their collaboration and temporal trends in keywords usage.

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