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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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Raw water reserve and conveyance capacity of West Water Canal of Metropolitan Waterworks Authority J. Nirunrat; W. Thaisiam; A. Pornprommin
Lowland Technology International Vol 20 No 2, Sep (2018)
Publisher : International Association of Lowland Technology

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Abstract

Metropolitan Waterworks Authority (MWA) is responsible for supplying potable water to Bangkok, Nonthaburi and Samut Prakan provinces. There are two raw water sources used, Chao Phraya River and Mae Klong River, conveyed via canal systems. At present, West Water Canal (WWC) system with the total length of 107 km carrying the discharge of about 20 m3/s from Mae Klong River. It was designed to be capable to convey 45 m3/s with using Bang Len Pumping Station (71 km from the upstream end). However, MWA modified the WWC system by constructing a bypass canal at the pumping station. Thus, water flows completely by the gravitation which saves both cost and energy. Nevertheless, it is expected that the present canal system cannot deliver water at its design conveyance capacity, and problems may arise in the future if water demand increases. In this study, we have performed a fully hydrodynamic onedimensional model. It is found that the present maximum capacity is approximately 24 m3/s. To meet the design capacity of 45 m3/s without using the pumping station, it is necessary to implement 15-km canal modification and build an additional bypass canal. The redesign of the canal will help MWA to save the energy at least 4,750 Mwh/year. In addition, it should be known that how long and how much we can use water reserve in the canal for production if the inlet at Mae Klong River is temporally closed due to emergency or canal maintenance. From the model result, WWC system can reserve water for 15 and 12 hours for the cases of the existing system under 24 m3/s and the modified system under 45 m3/s, respectively.
Assessing the climate change impact on floodplain inundation map in the Chiang Mai municipality, upper Ping river basin of Thailand K. Boonrawd; C. Jothityangkoon
Lowland Technology International Vol 20 No 2, Sep (2018)
Publisher : International Association of Lowland Technology

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Abstract

Coupling of water balance model and floodplain inundation model is developed to receive projected rainfall time series from two types of regional climate model (RCM). Providing Regional Climates for Impacts Studies (PRECIS) and Meteorological Research Institute (MRI) are RCM with resolution 0.2 x 0.2 degree (grid sie 20 x 20 km) daily time step, from year 20152044. They are generated from ECHAM 4 climate models. Empirical quantile mapping is used for bias correction of projection rainfall that its adjustment factors are estimated from comparison between observed and past projection rainfall from base-time period, year 1985-2014. A floodplain inundation model is applied based on 1D rating curve approach. This model receives peak runoffs as results from the water balance model, and generate flood extent in flood plain and draw flood inundation map of Chiang Mai municipality with different return periods. These expected results show the increase of flood inundation extent as a consequence of climate change
Assessment of water balance using SWAT – A case study of the Nakhon Ratchasima Province P. Kosa; T. Sukwimolseree
Lowland Technology International Vol 20 No 2, Sep (2018)
Publisher : International Association of Lowland Technology

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Abstract

In the dry season, the Nakhon Ratchasima province is facing a water scarcity problem in every year due to the gap between demand and supply of the water system. However, there are the high rainfall and runoff during rainy season. Then, the purposes of this study are to analyze the water balance and to manage the water resources in Nakhon Ratchasima province using SWAT. The study can be presented that, during dry season, the total amount of water demand is higher than the amount of runoff for the Lam Takhlong basin, Lam Phra Phloeng basin, Lam Sae basin, Lam Plai Mat basin, and Lam Chakkarat basin. However, this water demand can be supported by the maximum water storage in the reservoir. On the other hand, the total amount of water demand is less than the amount of runoff for Lam Choengkrai basin, Upper part of Lam Nam Mun basin, Lam Sa Thaet basin, and Second part of Lam Nam Mun basin. The excess water runoff from Lam Choengkrai basin should be diverted to Lam Takhlong basin and water diversion from Upper part of Lam Nam Mun basin should be considered for Lam Phra Phloeng basin and Lam Sae basin.
Submerged breakwaters design development based on artificial oyster reef C. Ketsiri; D. Kositgittiwong; C. Ekkawatpanit
Lowland Technology International Vol 20 No 2, Sep (2018)
Publisher : International Association of Lowland Technology

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Abstract

Due to the problem on coastal erosion is getting more severe currently, there should be the study on the potential impacts of coastal protection structures on the erosion and sediment movement on areas under influence of currents, tides and storm surges. The various kinds of coastal structures can be applied to solve, or at least, to reduce these problems. The present study focuses on detached breakwaters and artificial reefs which are classified as Low crested and submerged structures (LCS). It is used also to provide reducing for the hydraulic loading to become required level where the dynamic equilibrium can be maintained at the shoreline. To accomplish the mentioned goal, the design of LCS structures is needed to allow the transmission of a definite amount of wave energy over the structure by overtopping and also letting transmission occurred through the porous structure. Not only the term of mechanism but also the nature dynamics of the ecosystem are considered to create flexible and sustainable infrastructure while enhancing nature values. The coastal protection measures by using nature and natural processes are expected to have positive impact not only in nature and safety but also in other functions such as recreation or economy. In the present study, artificial oyster reef in Oesterdam, The Netherlands, is studied based on the geometric form, movement of particle shells inside, composition of structure of oyster reef related with the ability to reduce the wave energy.
Uplift of very sensitive soft clay due to pile driving W. Teparaksa; J. Teparaksa
Lowland Technology International Vol 20 No 2, Sep (2018)
Publisher : International Association of Lowland Technology

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Abstract

The subsoil of Samutprakarn province in Thailand consists of thick sensitive very soft clay layer. The construction, such as pile driving and excavation work would lead to reduce the shear strength of very soft clay or induce the excess pore pressure on very soft clay. This paper presents the results of pile driving around the press pit reinforced concrete structure which was excavated and constructed on the very soft sensitive clay. The pile driving effect surrounding the press pit caused the uplift of press pit. The uplift of press pit was investigated by additional soil investigation, piezometer installation as well as coring the base slab of press pit. The investigation result was analyzed for clarifying the uplift behaviors before remedial work. At present, the remedial work was already completed.
GEOSLICIER AND ITS APPLICATION FOR SOIL STRATA ANALYSIS T. Harianto; T. Hino; R. Jia; K. Ohgushi; T. Ichihara
Lowland Technology International Vol 15 No 1, June (2013)
Publisher : International Association of Lowland Technology

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Abstract

Many "nogoshi" i.e, lower sections of the river bank that allow upstream floodwater overflow, have been built on the Jobaru River in Kyushu Island, Japan. The soil strata in the floodpain adjacent to the Yago Nogoshi of the Jobaru River were studied using a Geoslicier. The sedimentary facies and the sedimentary ages of the soil strata were determined using Geoslicier samples. The sedimentary environmental of the test site was defined, and soil strata formed by sediments during large floods were identified. The layers below ground level (G.L.) -1.50 to -1.70 m are river channel deposits, and the layers above G.L. -1.50 to -1.70 m are back marsh deposits. The result of radiocarbon dating show that the river channel deposits were formed before AD 1500. The lower layers of the back marsh deposits, which contain a considerable quantity of plan roots, were formed at approximately AD 1600. The upper layers of the back marsh deposits, which contain a small quantity of plant roots, were formed after AD 1600. The time of artificial land alterations was deduced based on the results of the sample analyses.
PREDICTION OF SOIL WATER CHARACTERISTIC CURVE USING PHYSICALLY BASED SCALING TECHNIQUE S. Y. Liu; N. Yasufuku; Q. Liu; J. Yu
Lowland Technology International Vol 15 No 1, June (2013)
Publisher : International Association of Lowland Technology

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Abstract

The soil water characteristic curve (SWCC) is an important hydraulic parameter for modeling water flow and contaminant transport in the vadose zone. However, direct measurement of the SWCC is still difficult. The Arya and Paris (AP) model estimates the SWCC from particle-size distribution curve (PSD) based on the shape similarity of the two curves. They introduced an empirical parameter, a, used to scale pore attributes from hypothetical formations to natural structure. Several approaches have been used to derive a. However, the calculation precedures of these approaches are either quite complicated or are developed without paying much attention to the physical significance of the soil properties. In the present paper the physically based scaling technique (PBS) was applied to derive a for the AP model. Fifty soil samples, representing a range of textures that include sand, sandy loam, loam, sit loam, and clay, were selected from UNSODA hydraulic property database for calculating a using PBS approach. In addition, nineteen soil samples with different textures were used to verify effectiveness of proposed a values. The result compared with other approaches show that the PBS technique combine with the AP model is a more useful and easier approach to predict SWCC from PSD.
LONG-TERM CHANGE OF WATER QUALITY IN THE RESERVOIR OF THE ISAHAYA BAY RECLAMATION PROJECT Y. Mitsugi; N. Vongthanasunthorn; Y. Mishima; K. Koga; H. Araki; P. Ittisukananth
Lowland Technology International Vol 15 No 1, June (2013)
Publisher : International Association of Lowland Technology

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Abstract

In 1997, the Isahaya Reservoir was constructed at the innermost part of Isahaya Bay, Japan to prevent natural disasters and to develop water resources for large-scale farm lands. The main purposes of this study were to analyze the mechanisms underlying the water quality changes observed and to collect significant information for water quality management at the reservoir. Observed water quality parameters on chlorophyll-a, suspended solids, total nitrogen, dissolved inorganic nitrogen, total phosporus, dissolved inorganic phosphorus and chloride ion were analyzed by using a water quality model. It was found taht the results obtained from the developed water quality model agreed with the observed data. After calibrating the observed data, a simple sensitivity analysis was conducted to demonstrate the mechanisms of the water quality changes. The major water quality problems were suspended solids that had been resuspended by strong wind and eutrophication due to the enrichment of nutrients. The major mechanisms of water quality changes in the Isahaya reservoir were a coagulation and flocculation by brackish water and the transformation process of phosphorus. The coagulation affected the settling velocity of suspended solids and dissolved phosphorus. It was also revealed that the resolution process of dissolved phosphorus from suspended solids was controlled by the salinity.
ACCOUNTING FOR RISKS OF USING SHALLOW GROUND WATER FOR SECONDARY CROPS ON LOWLAND PADDY FIELDS IN INDONESIA D. Useng
Lowland Technology International Vol 15 No 1, June (2013)
Publisher : International Association of Lowland Technology

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Abstract

Most paddy fields in Indonesia laid on the lowland area and many of them have not sufficient water supply during the dry period. To maximize the use of land, some farmers planted secondary crops using the available shallow water table along the coastal areas. Some common plants planted during dry period on the lowland paddy fields are corn (Zea mais), soybean (Glycine max), groundnut (Arachis hypogaea), chili pepper (Capsicum annum), tomato (Lycopersicum esculentum), and mungbean (Phaselous radiatus). The use of secondary crops on paddy fields using shallow ground water embedded some potential risks that need to be counted. The study conducted to model the risks (production and market risks) associated with the ground water quality and irrigation application methods on the net returns on several crops under different irrigation treatments and application uniformities. Six crops were analyzed to show the potential return under furrow and border irrigation scenarios. Economic reliability measured in terms of Discounted Cash Flow performance of each type of crop. The risk analysis reveals that the three crops means that the crops are less risky than to the other three. The model sensitivity analysis performed to show the influence of input variables to the model outputs and the result showa the commodity prices inflation and ground water salinity are most sensitive to influence the model output.
PREFERENCES AND CONSTRAINTS REGARDING MOVING TO A FINAL RESIDENCE: A CASE STUDY IN HITACHI CITY, JAPAN M. Kinashi
Lowland Technology International Vol 15 No 1, June (2013)
Publisher : International Association of Lowland Technology

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Abstract

Some researchers have argued that a majority of Japanese have a strong desire to continue living in their current residence. This study hypothesized that some of these individuals, however, may well have a strong desire to change residence when they consider that actual requirements for receiving nursing care in the future. This paper, then, investigates preferences for and constraints on moving to a final residence, given the necessity of nursing care. The data are based on a questionnaire survey conducted among inhabitants of detached houses in suburban Hitachi City which is one of the typical suburban cities in Japan. A McNemar's test and correspondence analysis showed that less than 25% of the inhabitants were relatively certain that they would continue living in their current house in the future, whereas most were likely to change their residence whether they wanted to do or not. Furthermore, the inhabitants faced the necessity of compromising in the selection of their future residence (whether or not this involved a change of residence) due to a sense of being undeserving or out of consideration for their children.

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