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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 463 Documents
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Characteristics of the second stage of evaporation and water redistribution through double layered sandy soil profiles A. Alowaisy; N. Yasufuku
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

Evaporation from porous media involves a complex pore scale water and vapor transportation that directly affects the liquid phase distribution and fluxes. The presence of textural contrast boundary in multilayered profiles adds to the complexity. This study aims at evaluating the textural contrast boundary depth and individual layer thickness influence on the actual evaporation and water storage through double-layered soil profiles. For coarse overlying fine sand, it was found that the top layer small capillaries contribute to the majority of water lost through the falling rate stage. Considering fine overlying coarse sand profiles, the pumping phenomenon from the bottom coarse layer to the top fine layer occurs before the arrival of the drying front to the textural boundary due to the increasing suction forces within the top fine layer. The water storage capability of double layered soil profiles depends highly on the top to the bottom small capillaries ratio multiplied by the layer thickness ratio. Regardless the atmospheric conditions and layering sequence, it was concluded that the shallower the textural contrast boundary results in decreasing the total duration required to achieve the residual evaporation stage thus leads to higher water storage capabilities through the first and second evaporation stages.
Field validated prediction of latent slope failure based on cracked soil approach S. Alexsander; I.B. Mochtar; W. Utama
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

This study is to prove the existence of latent sliding of a suspected unstable slope using the cracked soils approach. This study was initiated by trying to map the cracks inside soil slope by means of measuring the Tomographic Resistivity, TR, and Induced Polarization, IP, of the soil at the slope prior to performing stability analysis of the slope. To map the cracks inside the slope at the study location, 3 lines of TR and IP were performed. The results of the 3-line mapping showed the existence of sliding plane toward the slope edge at a depth between 3 – 5 meters below the soil surface, and the sliding plane was about 30 – 50 meters in length. With the cracks and possible sliding planes were known, the cracks could be drawn in 3-dimentional model, as part of the topographical map of the slope. This study had predicted that another slope sliding would occur at the area where the highest stresses and strains concentration were located. It was at this location exactly that another slope sliding had occurred several months afterwards when heavy rain came.
A nonlinear analysis for GRS walls conceiving kinematics of failure against pullout S. Patra; J. T. Shahu
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

A modified nonlinear analysis is presented to investigate the pullout response of geosynthetic reinforced soil (GRS) walls. The analysis conceives a hyperbolic stress-strain relationship for the backfill, the kinematics of the failure and the deformation compatibility between the soil and the reinforcement. The deformation compatibility is incorporated by introducing an updated discretization technique, and the true projected length of the reinforcement after deformation is evaluated by a simple computational scheme. A case study is presented for an instrumented full-scale reinforced soil wall to validate the present analysis. The maximum tension in the reinforcement at each level is computed considering the effect of compaction, and the results are compared with the measured values and those predicted by AASHTO simplified method. The comparison shows that the present analysis gives a better estimation of the reinforcement tension thus can be easily integrated with the existing method. A parametric study is also conducted mainly to determine the effect of stiffness and strength parameters of the subgrade which have a significant influence on the design of GRS walls against pullout failure for all practical applications.
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.
The development of green building in China and an analysis of the corresponding incremental cost: A case study of Zhejiang Province J. Ge; J. T. Weng; K. Zhao; X. C. Gui; P. Li; M. M. Lin
Lowland Technology International Vol 20 No 3, Dec (2018)
Publisher : International Association of Lowland Technology

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Abstract

With a focus on the survey of the green building development in China as well as the evaluation of the corresponding incremental cost, this paper selects 276 green building projects in Zhejiang Province and obtains comprehensive data, based on which the development of green buildings in the province is analysed. The results are then compared with the national data in such aspects as the certification grade, building type, geographical distribution and application frequency of green building technologies. Statistical analyses are also conducted on the technology application frequency and the incremental cost, which conclude that different types of green buildings would apply significantly different technologies considering factors like energy saving, material saving, indoor environment quality and operational management. According to the sample data, the incremental cost of green building technologies is found to make up less than 2% of the total building costs; and it increases with the upgrading of certification grade. When the floor area exceeds 100,000 square meters, the incremental cost would remain less than 60 yuan per square meters. Costs for water-saving and energy-saving technologies account for over 80% of the total incremental cost. This study would provide guidance for the selection of green building technologies.
Influence Of Thermal Experience On Thermal Comfort In Naturally Conditioned University Classrooms J. Y. Shen; S. Kojima; X. Y. Ying; X. J. Hu
Lowland Technology International Vol 21 No 2, Sep (2019)
Publisher : International Association of Lowland Technology

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Abstract

This study aimed to investigate the relevance of thermal experience on students’ thermal perceptions in the naturally conditioned university classrooms, and identified the suitable values of indoor thermal parameters for students’ thermal comfort in Southeast China. Field measurements on environmental parameters and questionnaire surveys of students’ thermal perceptions were conducted in the whole duration of twelve lectures in summer and winter. Thermal perceptions of TSV, TAV and TPV were recorded 3 times (15min, 45min, 95min) within each survey. It was found that, the indoor thermal conditions for students were more comfortable and acceptable in summer than in winter. Positive correlation of thermal sensation and indoor operative temperature occurred in summer, while negative correlation occurred within the indoor operative temperature range of 9.8~15.3℃ in winter, and only when the initial temperature was upon 15.7℃, could the normal response of students’ thermal sensation on the ambient environment return back. Thermal memory will make impact on the thermal perception as the on-site temperatures lose their control of current thermal response gradually, especially under the extremely cold thermal conditions. Meanwhile, TSV, TAV and TPV were unsynchronized in both summer and winter, especially in winter.
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.
Improvement of Hydro-Meteorological Products and Services in Viet Nam: Situation Appraisal and Policy Recommendation Application N. Quang T. Thuy; N. D. Quang; D. Q. Tri; B. M. Ha; H. P. Cuong; D. V. Trong; H. D. Cuong
Lowland Technology International Vol 21 No 2, Sep (2019)
Publisher : International Association of Lowland Technology

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Abstract

Rapidly developing tropical countries such as Viet Nam are experiencing a rapid demand for hydro-meteorological information services. Evaluation of end-users’ demands is one way to inform policy development for organizations such as the Viet Nam Meteorological and Hydrological Administration so that they can provide the most relevant and useful products and services to the diverse and evolving market. An initial interview survey was conducted across 18 provinces and cities in Viet Nam between October and November 2017 to elicit information that would improve understanding of end-users’ perception of the importance of hydro-meteorological information, the quality and utility of current products and services, and expectations for development of hydro-meteorological information over the near future. The results indicated that the contents of the bulletins or the speed of access on TV or the website of the National Center for Hydro-meteorological Forecasting) need to be improved to meet the needs of the wide range of users. Furthermore, the end-users will be happy to pay if the information is accurate and timely. Experience from this initial survey will be used to expand the interview survey to the national scale, covering all 63 provinces and 5 centrally-controlled municipalities, and to increase the range of stakeholders’ participation.
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%.
Ground penetrating radar attributes analysis for detecting underground artificial structures in urban areas, Vietnam Cuong Van Anh Le; Thuan Van Nguyen
Lowland Technology International Vol 22 No 2 (2020): Lowland Technology International Journal
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v22i2, Septemb.585

Abstract

Maps of underground construction works for maintenance, building and planning tasks are essential in urban areas. Ground penetrating radar (GPR) has shown effectiveness by providing high-resolution imaging of subsurface structure. Reflection/ diffraction from boundaries, singular objects, or edges of anomalies could lead to meaningful events like strong signals or shapes of hyperbolae in the common offset unmigrated GPR sections. In urban areas, although the shielded antennas help the GPR machine to remove most of man-made noises transmitted from the air, the GPR data are still heavily contaminated by types of noises. Concerned objects (i.e., underground pipes, tunnels, and subsurface structures) can be effectively revealed by applying the GPR attributes that are calculated from the processed abundant GPR data information as enhancement of ratio between signal over noise. In our paper, for the GPR data surveyed in Ho Chi Minh City, Ba Ria – Vung Tau Province, and Dong Nai Province, Vietnam, we have utilised a set of GPR attributes (i.e., amplitude before/after migration, cosine-of-instantaneous phase, and energy) and volume rendering (i) to define 2D/3D anomalies relating to underground manmade system, and (ii) to uncover hidden underground objects with illumination of upper concrete construction steel net of buildings.

Page 34 of 47 | Total Record : 463

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