Dadang Ahmad Suriamihardja

• Professor
• Professor at Hasanuddin University

This study aimed to model the distribution pattern of water masses by considering the upstream discharge and the tidal elevation downstream. The method of this study carried out field observations as inputs required in numerical simulations. The field observations covered upstream discharge of Mahakam River and two-position of tidal levels, a river...

The porous breakwater is a breakwater designed in a transitional sea with an upright position in the direction of the waves that protect the coastal area from erosion and abrasion as it is caused by wave energy. This study aims to determine the effect of pipe diameter and depth variation on wave transmission in porous breakwaters and to analyzing t...

Waves are raised on the flume and interact with porous breakwater structures. As a result of these interactions, waves will experience reflection, dissipation, and transmission. The research was conducted with a model of pipe wall roughness to analyze the reflection coefficient and high wave transmission coefficient on each change in the coefficien...

Bongongoayu is one of the regions in Indonesia that has geothermal potential. Bongongoayu requires surface and subsurface data to support the preliminary data. This research aims to determine surface and subsurface data conducted by geology and magnetic method. The surface data, including geomorphology, lithology, hydrology and manifestation. The s...

Observations of physical oceanographic parameters including temperature and salinity were carried out in Estuary Mahakam and Karang Mumus Rivers, on July 8, 2018, and July 14, 2018, to determine the vertical distribution patterns of temperature and salinity used to identify the type of estuary confluence Mahakam and Karang Mumus Rivers. Observation...

The sedimentation process can move slowly and continuously during sediment transportation is still ongoing from the mainland. The sediment evidence has been done by pairing the current bathymetric measurement of the previous data from the bathymetric map of the DISHIDROS of the Indonesian Navy 2011 in the confluence of the Mahakam and Karang Mumus...

Waves towards the shore that have a porous breakwater building will experience reflection and transmission, to determine the height of reflection and transmission wave is needed a study by the process of generating waves on the flume with a porous breakwater building, the effect of wave changes in its propagation requires an experiment in the labor...

Penelitian ini menduga bahwa distribusi curah hujan berinteraksi langsung dengan bentuk topografi, sehingga dapat memperkirakan arah aliran dan besar debit aliran di sungai. Bentuk topografi dapat menunjukkan arah aliran dari dataran tinggi ke dataran rendah. Adapun tujuan penelitian ini adalah memetakan kontur distribusi curah hujan, kontur topogr...

A mathematical model is developed for describing a propagating long wave in an estuary. Wave dynamics in an estuary will employ the Saint Venant equation in the form of a nonlinear partial differential equation (PDE), which consists of equations of mass conservation and momentum conservation. Waves propagate in an estuary usually generated by tides...

Tombolo-shaped beach in Galesong District orientated westward is a nice morphology behind the detached Sanrobengi Island in front of mainland of Takalar Regency. Our main interest is formulated as the problem of how the tombolo whether is experiencing continual growth or retreated. This study aims to explain changes of shape and its area of the tom...

All Several macro earthquakes have occurred at the Matano fault so it is interesting to study how the energy attenuation in the coda wave. Coda wave is a signal that follows a secondary wave on a seismogram recording. Some macro earthquakes can be monitored well by BMKG through LUWI Station at a distance of 200-300 km from the epicenter. The coda Q...

A boundary element method (BEM) is utilized to find numerical solutions to boundary value problems of quadratically graded media governed by a spatially varying coefficients anisotropic-diffusion convection-reaction (DCR) equation. The variable coefficients equation is firstly transformed into a constant coefficients equation for which a boundary i...

A boundary element method (BEM) is utilized to find numerical solutions to boundary value problems of homogeneous media governed by as anisotropic-diffusion convection-reaction (DCR) equation. Some problems are considered. A FORTRAN script is developed for the computation of the solutions. The numerical solutions verify the validity of the analysis...

A hydrological cycle in the atmosphere plays an important role in the Earth system. [1] The hydrological cycle in the atmosphere is a source of fresh water for life on earth. Starting from the density of heavy water, it is converted into a mild vapor density which allows an increase in water vapor from the sea surface to the dew point where the pro...

A natural distillation process as an atmospheric machine in producing fresh water from seawater is of importance to be relearned. This study aims to scrutinize a thermodynamic cycle involving evaporation on sea surface and condensation at a possible height to occur in lower temperature and pressure by comparing reversible and irreversible process....

Micro-tremor analysis has been used on micro-zonation studies for Sorowako City area. This study is of importance since Sorowako City closes to the Matano Fault as an active seismic area. The city has been developed through mining and agriculture activities, despite prone to be vulnerable to earthquake hazards. This vulnerability increases due to h...

This study aims to determine earthquake vulnerable zones. We conducted research on earthquake macro-zonation based on PGA, Modified Mercalli Intensity (MMI), and type of rocks around Matano Fault in the area of 1.60 S to 2.990 S and 120.50 E to 122.470 E. We have acquired Maximum PGA and Modified Mercalli Intensity (MMI) for each observation point...

Upwelling phenomenon is crucial to be forecasted, mainly concerning the information of potential fishery areas. Utilization of calibrated model for recorded upwelling such as INDESO gives benefit for historical result up to the present time. The aim of this study is to estimate areas and seasons of upwelling occurrences in the Flores Sea using data...

Schaefer's equation relates an interaction between population of fishes and the number of units of fishing effort. The population growth of fishes is reduced by the number of units of fishing effort, while the population growth of units of fishing effort depends on the existence of fishes. This paper aims to examine the stability of an anti-symmetr...

Rate of mineral deterioration in Tanjung Bunga Beach, Makassar city sediment, as a coastal city area that temporarily evolved with infrastructure development, through a Compaction test has found damage mineral from cracks, split and shatter. The aim of this research is to classify the compaction test from mineral as result texture breakage from com...

In Indonesia about 86% of people suffer from periodontal disease. Many cases of illness, including periodontal disease not only caused by microorganism to cause disease, yet environmental factors, such as water, also show one of the factors that can lead to the onset of the disease To analyze the relationship of mineral levels in drinking water and...

To date there were few studies of wave energy converters that utilize the gravity force of sea water as a prime mover of wave energy converter to generate electricity. In this work, physical model of wave energy converter based on water mass gravity force to generate electricity were investigated. Experiment was conducted at Hydraulic Laboratory, H...

Tanjung Bunga Beach, Makassar city, is a coastal development area, temporarily growing rapidly with infrastructure development. Based by study that has been done, grain size analysis of Tanjung Bunga beach sediments was classified in fine sand (0.125-0.25 mm), medium sand (0.25-0.50 mm), and coarse sand (0.50-1.00 mm). Petrographic analysis of 15 s...

Jeneberang River is mined in order to fulfill construction materials demand of Gowa Regency and Makassar City. The aim of this study were to develop the dynamical system for supply-demand model suitable for prospecting the future of construction materials and using the model to explore effects of parameter uncertainty by using sensitivity analysis,...

This research aims at finding the shore morphological and area changes for every periods of monsoons on the three reef islands of Makassar, Spermonde waters, related to the wind directions. This research used Landsat Image ETM8+ of the late year of 201 to early 2016 to map the island changes. Data were analyzed using ArcGis 10.13. Wind data were ob...

To date there were few research on the effect of non-linearity properties of the ocean waves on the performance of wave energy converter (WEC), which uses a series of unidirectional gear. One such parameter is the variation of wave period. The influence of wave period variations on the performance of physical model of the wave energy converters hav...

Abstract: The Coastal area of Tanjung Bunga, Makassar city is continuously being reclaimed to become a coastal city and has experienced an increasing physical loading. This study aims to investigate the changes found from sediment load test on the beach using CBR Test (California Bearing Ratio) (Fine Sand 2451.36 - 2498.77 kg / cm3, Medium Sand 201...

Abstract: The Coastal area of Tanjung Bunga, Makassar city is continuously being reclaimed to become a coastal city and has experienced an increasing physical loading. This study aims to investigate the changes found from sediment load test on the beach using CBR Test (California Bearing Ratio) (Fine Sand 2451.36 - 2498.77 kg / cm3, Medium Sand 201...

Our research has been looking for astronomical aspects in Buginese-Makassarese culture from historical to ethnographical sources. We found from history that astronomy had been used by Buginese - Makassar society long before Islam came to South Sulawesi at early 17th century and had their own first telescope at the time of Gowa's Prime Minister, Kar...

The aim of this study was to develop a model of ocean wave energy converter based on water mass gravity force (WEC-WGF) to overcome the flaws of existing wave energy converter that rely on water buoyancy force. This paper presented physical model experiment result of wave energy converter based on water mass gravity force. The harvested energy were...

To date there has not been an adequate information on the effects of container shape on the power take off (PTO) performance of wave energy converters (WEC) based water mass gravity force of that was developed at the Hydraulics Laboratory, University of Hasanuddin Indonesia. In this work, physical model investigations were carried out to study the...

Sustainability is the term of matter which is frequently discussed qualitatively. In this paper we try to formulate quantification of sustainability in mining activities by considering the aesthetic patterns that connect. The mining activities will be divided into three compartments: extracting, processing, and delivering. Within three compartments...

The prediction of converted energy by one way gears wave energy converter may be influenced by non-linearity properties of the ocean waves. To date there has not been an adequate analytical model to predict the power production of one way gear wave energy converter under irregular wave condition. In this work, analytical model is developed to descr...

Due to the increasing activities of underwater earthquake along the Sulawesi's Waters past this one last decade, the development of future tsunami mitigation plan become important for Sulawesi Island. This research pin pointed to the easiness of the mitigation plan concept and the availability of the infrastructure. The development of this mitigati...

For almost 33years, Sulawesi Island which is surrounded by several small and big tectonic plates had been struck 270 times by earthquake above 5.0 in magnitude. This number of occurrence tends to get higher and higher each year, beginning after the raising activity of Sunda Arc past last ten years, which recently struck Padang, West Sumatera in Sep...

Geothermal energy is one of the natural resources which emerged on the subsurface ofthe earth can be in a gaseous form (the vapor heat) or in the form of hydrothermal. The geothermal Panggo that located at watersheds of Kalamisu river, was one of the three sources of hydrothermal system existing in district Sinjai East. The existence of the geother...

Suatu sistem ekonomi produksi senantiasa berupaya menemukan suatu proses yang paling boleh jadi mendapatkan surplus terbesar. Para akhli ekonomi-mikro terkemuka telah memformulasi suatu fungsi produksi yang digunakan untuk mengukur kinerja suatu sistem ekonomi produksi. Penting bagi seorang perencana untuk menghitung terlebih dahulu kinerja dari se...

In 2012 the Geological Agency of Indonesia discovered 14 new geothermal sites in Indonesia, one of which is in the area Diloniyohu (now Bongongoayu) are included in the administrative area of the District Boliyohuto Gorontalo regency. Preliminary investigation geothermal area with geomagnetic methods used to determine the geothermal prospects. This...

Wave energy potential in coastal areas may be based on environmental characteristics and ocean wave parameters. To date, there is a limited number of technology that is easy to use to quantify the wave parameters such as wave height and period. In this work, an analytical method was introduced by means of digital video processing software that desc...

Type of beach sediment is very important in determining what the beach looks like, beside waves, tides and wind factors. Different beaches have different types of sediment texture. Beach classification can be usefull coastal planner to group beaches of similar characteristics and behaviours. This paper aims to explain beach morphodynamic states bas...

Type of beach sediment is very important in determining what the beach looks like, beside waves, tides and wind factors. Different beaches have different types of sediment texture. Beach classification can be usefull coastal planner to group beaches of similar characteristics and behaviours. This paper aims to explain beach morphodynamic states bas...

The characteristic of the change sediment texture and topography features are primary variable for coastal morphodynamics state, besides Ω is known as the dimension fall velocity, period and breaker wave height. Morphodynamic state as a coastal system is an important issue for a proper coastal management and planning. Study area is located at Parep...

Chaffis part of the grain grains (cereals) in the form of dry sheets, scaly, and can not be eaten, which protects the inside (endospermium and embryo). Husk can be found in almost all members of grasses (poaceae), although in some kinds of cultivation were also found that the variation of grain without husk (eg maize and wheat). This husk is a wast...

A geophysical survey employing seismic refraction and vertical electrical sounding have carried out at the sport center area of Hasanuddin University, South Sulawesi, Indonesia to determine the structural setting and the depth of bedrock at the subsurface using a 12 channel seismograph and Resistivity-meter single-channel Twin Probe Resistivity (G-...

ABSTRAK Kami telah melakukan perjalanan ke tiga daerah di Sulawesi Selatan (Barru, Sidrap, dan Bone) untuk melakukan diskusi secara langsung tentang Lontara' Pananrang dengan Palontara' (ahli Lontara'). Lontara' Pananrang merupakan naskah yang ditulis pertama kali di atas daun lontar dan kemudian ditulis di atas kertas membahas bagaimana masyarakat...

Mining activities in Jeneberang River carry out to fulfil construction materials demand of Gowa Regency and Makassar City. In the recent years mining activities are under strong pressure to comply with good environmental practice. The issue of sustainable development is becoming increasingly important for the mineral extraction. Analysis of four di...

This paper discusses economical sustainability in the frame of neoclassic economy from thermodynamic viewpoint. Hitherto, economic sustainability divided into strong and weak sustainabilities. The former represents economical activities complying strictly with the ecological principles maintaining order, balance, and harmony among creatures and nat...

Bongongoayu area is one of the areas in Gorontalo which is a place of geothermal manifestations (hot water pond) with a surface temperature of 43 ⁰C - 59 ⁰C. This research aimed to analyze sections of magnetic anomalies and electrical. The method used is quantitative research methods. Acquitition data was carried out in the field by using Proton Pr...

From the western to southern part of Pangkajene area, a number of rising topography are shown on plain morphology in the Walanae Depression. This topography anomaly in the surrouding plain morphology which composed of volcanic products is interpreted as lava domes. This study aims to identify morphology and lithology of the lava domes in Pangkajene...

The spermonde islands are a reef complex trending north – south in the western coastline of South Sulawesi. The development of the reef is controlled by geological processes forming Makassar Strait. The strait arises since rifting between Kalimantan and Sulawesi in Paleocene Era and followed by spreading to form Makassar Strait. The geological proc...

Aggregate plays an important role in developing infrastructure because it is the major raw materials used in construction such as roads, hospitals, schools, factories, homes and other buildings. Sand and gravel are essential sources of aggregate and exploited often from the active channels of river systems. Jeneberang River is one of the main river...

Coral Reef Islands of Spermonde (Sangkarang) extends widely in southwest of South Sulawesi Province composed of coral reef islands which are functioning as natural breakwaters, and as coral reef islands providing biological production. This paper aims to describe some problems of coastlines of the islands due to exceeding exploitation from view poi...

Tulisan ini berbasis pada sistimatika yang dimulai dari uraian tentang sejarah awal dan karakteristik lingkungan permukiman pesisir dan permukiman di atas air (PAA). Kemudian dilanjutkan dengan uraian tentang aspek-aspek penting upaya konservasi ekosistem pesisir (KEP). Berdasarkan dua uraian tersebut kemudian dilakukan ekstraksi permasalahan dalam...

Recently, the Cone Penetration testing (CPT) is a rapid method for determining the mechanical and transport properties of soils. The CPT provides continuous profiles of soil characteristics that are reliable, fast, and economical. Moreover, the estimation of the hydraulic conductivity from the CPT is traditionally made from the pore pressure dissip...

This study is to find clear understanding and new formulation in developing the prospective tourism by combining the Karst Area of Maros-Pangkep with Spermonde Archipelago (the KAMP-SA), South Sulawesi Province based on its nature and culture. One of the utilizations of nature and culture can be considered and promoted as sustainable tourism as a m...

This study is to find clear understanding and new formulation in developing the existing tourism in South Sulawesi Province based on its nature and culture. One of the utilizations of nature and culture should be considered and promoted as sustainable tourism. Regional governments should be able to identify potencies of its natural characteristics...

Interaksi di antara manusia, dan manusia dengan alam dapat didekati sebagai suatu proses produksi materi, energi, dan jasa yang melibatkan lingkungan, input, proses, dan produk. Produksi secara ekonomi tersebut ditujukan untuk penyediaan barang-barang konsumsi, atau barang-barang modal, walaupun pada gilirannya barang-barang modal inipun kelak akan...

Impacts of the El Ni n o-Southern Oscillation ENSO and Indian Ocean Dipole IOD events are investigated using meteorological data and the NCEP NCAR reanalyzing global data The wavelet analysis is used to extract ENSO and IOD variability in the time-periods and correlation analysis is implemented on the sea-surface temperature seasonal rainfall perce...

In order to establish a wave-current interaction model for rip currents, a set of first-order linearized governing equations describing the 2-D nearshore circulation is derived from the equations of nearshore currents by the perturbation method. Wave refraction induced by the generated currents is fully considered. The solutions to the field equati...

A two layer undertow model is developed which consists of surface and inner layer. The surface layer defines breaking wave dynamics and the inner layer defines the mean flow(circulation) and turbulence fields. The interface between two layers is determined by time and depth averaging of the mean water level and wave height in the surf zone (interfa...

Impacts of the El Niño-Southern Oscillation (ENSO) and Indian Ocean Dipole (IOD) events on the Indonesian rainfall were studied using observational data and the NCEP/NCAR reanalyzing global data. ENSO and IOD variability in the time-periods are detected by using wavelet analysis, and we attempt composite analysis of the rainfall amounts over Indone...

Makassar city has an earthquake vulnerability relatively low compared with other regions in Indonesia, however the mapping detail related to the amplification of seismic waves need to be done in the interests of civil engineering, planning and others. It's become general knowledge that the magni-tude of the damage during the earthquake was strongly...

Spermonde Archipelago is coral reefs platform located along the southwestward off-shore of Makassar City and occupied with Makassarese, Buginese, and Mandarese who manage marine resources for less than a century. In the last 30 years the islands began to connect with external markets which changed their fishing techniques. The change threats signif...

Kyoto University (京都大学) 0048 新制・課程博士 博士(工学) 甲第4365号 工博第1090号 新制/工/773 UT51-89-W13 1989-07-24 京都大学大学院工学研究科土木工学専攻 (主査)教授 土屋 義人, 教授 今本 博健, 教授 中川 博次 学位規則第4条第1項該当