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Run - Up dan Run - Down Akibat Pengaruh Sudut Datang Gelombang pada Berbagai Unit Lapis Lindung Pemecah Gelombang Sriyana, Sriyana; Hadihardaja, Iwan Kridasantausa; Hadihardaja, Joetata
Jurnal Teknik Sipil Vol 14, No 4 (2007)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (354.794 KB)

Abstrak. Beberapa variabel yang mempengaruhi untuk perencanaan struktur pemecah gelombang adalah tinggi run-up and run-down. Gelombang run-up dapat digunakan sebagai variable untuk menentukan struktur pantai dan gelombang run-down untuk kerusakan struktur bangunan pantai. Tujuan penelitian ini adalah untuk menentukan run - up dan run - down pada bangunan pemecah gelombang denganperbedaan arah sudut datang gelombang. Metode yang digunakan dalam studi ini adalah dengan model fidfik, dimana gelombang yang dibangkitkan adalah gelombang acak (irregular wave) gelombang tidak pecah. Spektrum yang digunakan adalah spectrum. Bretschneider, dengan benda uji lapis lindung tetrapod, kubus. Hasil yang diperoleh dalam studi terlihat bahwa parameter yang mempengaruhi terjadinya tinggi run-up and rundown pada breakwater dipengaruhi oleh periode gelombang (T), tinggi gelombang datang (H), jenis lapis lindung, kedalaman (d), dan arah sudut datang gelombang (Î¸). 0o dan 15o, hasil run-up yang terjadi cenderung naik atau sama pada sudut 0o dan 15o pada semua unit lapis lindung. Sedangkan pada sudut 30o, tetrapod dan batu pecah cenderung naik dan kubus cenderung turun. Hasil yang sama diperoleh untuk run - down.Abstract. Some of the influencing variables for the structure design are wave run-up and run-down. Run-up wave can be used as the variable in determining the coast structure crown height and run-down wave influences the structural damage. The objective of this study is determine the run-up and run-down performance on breakwater with different angle of wave direction. This study is carried out by means of irregular non-breaker waves on physical modeling. The spectrums used on irregular wave is Bretschneider, employing tetrapod, cubes, and rubble mound as the armour layer. The results of this study showed that the parameter which influence on the occurring run-up and run-down height at breakwater influenced by wave period (T), incoming wave of height (H), armour layer, water depth (d), and angle of wave direction (Î¸). 0o and 15o, , the run-up result tends increased or the same at the angle of 0o and 15o in all protection layer unit. While at 30o, tetrapod and broken stone tends increased and cubes tends decrease. Similar results are obtained for run-down.

Determining The Critical Degree of Reservoir Lifetime for The Saguling Reservoir Based on The Sediment Inflow Simulation Bakhtiar, Bakhtiar; Hadihardaja, Joetata; Hadihardaja, Iwan K.
Jurnal Teknik Sipil Vol 17, No 1 (2010)
Publisher : Institut Teknologi Bandung

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Abstract. This study aims to find out the relationship between the critical degree of reservoir lifetime and sediment inflow. The critical degree of reservoir lifetime is defined as the ratio between the designated lifetime of the reservoir and its effective lifetime. The effective lifetime of a reservoir is affected by the amount of sediment flowing into the reservoir and trap efficiency. Soil and Water Assessment Tool (SWAT) version 2005 model was incorporated into this study to simulate hydrological processes taking place in the catchment. The reliability of of SWATmodel depends greatly on the data availability and some parameter adjustments. From the calibration and validation results on monthly data, the model is considerably of good performance. TheÂ modeling resultsrevealed that the mean sediment yield is 235.86 ton/ha/year, and the mean sediment inflow into the reservoir is 5,102,000 tons per year which is equivalent to 3,836,090 m3 per year resulting in 43.66 years of the reservoir lifetime (21.66 years remaining) which corresponds to the critical degree of 2.29 The graph plotting the values of the sediment inflow and the critical degree of reservoir lifetime reveals a linear relationship. Abstrak. Penelitian ini dimaksudkan untuk mencari hubungan antara tingkat kekritisan umur waduk dengan inflow sedimen. Tingkat kekritisan umur waduk didefinisikan sebagai perbandingan antara umur rencana waduk dengan umur efektifnya. Umur efektif waduk dipengaruhi oleh jumlah sedimen yang masuk ke waduk serta efisiensi pengendapan sedimen. Model Soil and Water Assessment Tool (SWAT) versi 2005 digunakan dalam penelitian ini untuk mensimulasikan proses-proses hidrologi yang terjadi di daerah tangkapan. Keandalan model SWAT sangat bergantung pada ketersediaan data dan penyesuaian beberapa parameter. Dari hasil kalibrasi dan validasi terhadap data bulanan, kinerja model dinilai cukup baik. Hasil simulasi menunjukkan bahwa sediment yield rata-rata sebesar 235,86 ton/ha/tahun, serta inflow sedimen rata-rata yang masuk ke waduk sebesar 5.102.000 ton per tahun yang ekivalen dengan 3.836.090 m3 per tahun yang menghasilkan umur waduk sebesar 43,66 tahun (21,66 sisa umur waduk) yang bersesuaian dengan tingkat kekritisan 2,29. Grafik yang menghubungan nilai inflow sedimen dengan tingkat kekritisan umur waduk menunjukkan hubungan yang bersifat linear.

Badan Akreditasi Nasional Industri Konstruksi Suatu Kebutuhan Wibowo, Muhammad Agung; Hadihardaja, Joetata
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 14, Nomor 3, Edisi XXXVI, OKTOBER 2006
Publisher : Department of Civil Engineering, Diponegoro University

The construction industry has a significant role to the contribution of the development both in developed and developing countries.Â The importance of the industry is not only in its product but also in the scale of the industry, its share in the national economy and how it affects society. Moreover, construction products, such as roads, bridges, railways, irrigation, schools, hospitals, dwellings, offices and factories are an important element in the economy and in improving living standards. An important issu of the construction industri in developing countries is to improve the quality of the industry due regard to social, envronment and sustainability aspect.Â One of the alternative solution is to develop a Construction Industry Development Board (CIDB).Â However, the detailed way in which all of aspects in the CIDB interact is not well understood.Â This paper presents a possible system of CIDB model by using a prototype model from National Accreditation Body of Higher Education System.Keywords: construction industry development, government, CIDBPermalink: http://www.ejournal.undip.ac.id/index.php/mkts/article/view/3953[How to cite: Wibowo, M.A. dan Hadihardaja, J., 2006, Badan Akreditasi Nasional Industri Konstruksi Suatu Kebutuhan, Jurnal Media Komunikasi Teknik Sipil, Volume 14, Nomor 3, pp. 277-286]

Variasi Koefisien Kekasaran Manning (n) pada Flume Akrilic pada Variasi Kemiringan Saluran dan Debit Aliran Putro, Haryono; Hadihardaja, Joetata
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 19, Nomor 2, DESEMBER 2013
Publisher : Department of Civil Engineering, Diponegoro University

Based on the book of open channels hydraulics by Ven T. Chow (1988) mentioned that the big problems in application Manning equation is determine of roughness coefficien n, because there is no certain way to choose value of n. At the current knowledge, choosing the actual value of n is estimated flow resistance on certain channels, that really can not be taken into specific value. The purpose of this study is experimentation to describe the differences Manning roughness coefficient (n) at the same material of channel by a different channel slope and discharge. The method used is by modeling the physical channel with a width of 15cm and depth of 20cm with akrilic material thickness of 0.5 cm. Flow in a channel by channel basis slope variation 0.0087; 0.0175; 0.0349 and 0.0524. With the discharge varies from 1 to 4.5 liters / sec. The results of the analysis showed there vairiasi n values between 0.006 to 0.032.

Pengaruh Curah Hujan Rata-rata Tahunan terhadap Indeks Erosi dan Umur Waduk pada DAS Citarum Hulu Bakhtiar, Bakhtiar; Hadihardaja, Joetata; Hadihardaja, Iwan K.
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 19, Nomor 1, JULI 2013
Publisher : Department of Civil Engineering, Diponegoro University

The aim of this study is to find out the effect of annual rainfall on the erosion index and the life of a reservoir. The erosion index is defined as the total soil loss divided by the tolerable soil loss. The life of a reservoir is affected by the amount of sediment flowing into the reservoir and sediment trap, which is a function of the effective capacity of the reservoir and the inflowing water. Soil and Water Assessment Tool (SWAT) version 2005 model was incorporated into this study to simulate hydrological processes taking place in the catchment. ArcSWAT (ArcGIS Interface for SWAT 2005) program was used as a preprocessing tool to write in input files to be executed by SWAT.SWAT model involves a great number of parameters. Hence, its reliability depends so much on the data availability and some parameter adjustments. From the calibration and validation results on annual data, the model is considerably of good performance. This was proven from the coefficient of correlation (r), coefficient of determination (R2), model efficiency (ME), and index of agreement (IA) which are close to 1 except for the sediment inflow. The difference between the observed and simulated sediment inflow resulted because the SWAT model accounts for the annual variation in precipitation and mean inflow discharge which is not manifested in the observed data. The modeling results revealed that the average inflowing sediment into the reservoir is 5,102,000 ton/year resulting in 46.18 year effective life of the reservoir which corresponds to the critical degree of 1.15. The graph plotting the values of the sediment inflow and the critical degree of the reservoir life reveals a linear relationship.

KARAKTERISTIK ALIRAN AIR DALAM MODEL SALURAN TERBUKA MENUJU KAJIAN HIDROLIKA EROSI DAN TRANSPOR SEDIMEN Bakhtiar, Bakhtiar; Hadihardaja, Joetata
MEDIA KOMUNIKASI TEKNIK SIPIL Tahun 17, Nomor 2, JUNI 2009
Publisher : Department of Civil Engineering, Diponegoro University

This paper is prepared as a comprehensive resume of results of continuing research of the author at Fluid Mechanics and Hydro dynamics Laboratory,Â DepartementÂ of Civil Engineering, Engineering Faculty, Sangga Buana YPKP University, in collaborating with lecturer team and last year student researchers. The propose of this research is to prove theoretical and mathematical of fluid mechanics and fluid dynamics with observation and measurements to the real water flow in laboratory channel model. Two parts of experiments was done, first allowing water discharge in glass ditch model, and second with add the bottom channel with sand layer. So these research included the difference viscosity of fluids. The results proved that theoretical and mathematical models of fluid mechanics and fluid dynamics characteristic are agreed with experimental observations and measurements in laboratory. Those characteristics included discharge, velocity, flow depth, Froude number, hydraulic radius, and shear stress. Next, these research also propose to be continue to observe the characteristic of sediment transport in water flow. Keywords : Theoretical discharge, theoretical velocity, Froude number, observed discharge, observed velocity, water flow depth, hydraulic radius, shear stress. ABSTRAK Makalah ini merupakan rangkuman hasil pekerjaan penelitian yang dilakukan penulis selama di Laboratorium Mekanika Fluida dan Hidrodinamika Jurusan Teknik Sipil Universitas Sangga Buana YPKP, bersama tim dosen dan para mahasiswa tugas akhir. Tujuan penelitian terutama adalah untuk pembuktian model-model teoritik melalui pengamatan langsung aliran air nyata dalam saluran yang dimodelkan. Dua bagian eksperimen telah dilakukan yaitu dengan saluran kaca dan saluran kaca yang dasarnya dihampar pasir, dengan demikian aliran air pada eksperimen kedua akan membawa pasir, sehingga penelitian ini menguji karakteristik dua aliran dengan viskositas yang berbeda. Hasil menunjukkan bahwa karakteristik aliran air di saluran terbuka yang diturunkan secara teoritik dan didekati dengan model matematik sesuai dengan hasil pengamatan dan pengukuran pada model saluran di laboratorium. Karakteristik yang terbuktikan menyangkut debit, kecepatan, kedalaman aliran, bilangan Froude, jari-jari hidrolis, dan tegangan geser. Penelitian ini ditujukan pula untuk mendalami aspek transportasi sedimen, sebagai penelitian lanjutannya. Kata kunci: Debit teoritik, kecepatan aliran teoritik, bilangan Froude, debit pengamatan, kecepatan aliran pengamatan, kedalaman aliran pengamatan, jari-jari hidrolis, tegangan geser.

Membangun Industri Konstruksi Indonesia Menjadi Kelas Dunia Hadihardaja, Joetata
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 13, Nomor 2, Edisi XXXII, JUNI 2005
Publisher : Department of Civil Engineering, Diponegoro University

Multi dimension crisis that has been happening since 1997 in Indonesia, generates remarkable economics impact and also has an effect on the world of construction industry company. To develop world-class construction industry, it is needed entirely evaluation, not just in the industrial company itself, but also in related parties. Based on the evaluation, recommendations such as the importance of reconstruction certification and of revitality to increase construction industry performance, will be gathered. Contribution of human resources is depending on worker ability including achievement and potential ability. Construction industry can apply Quality of Work Life (QWL) systematically, so workers will feel be treated, be trusted, be respected and be participated as part of company that expands become a world-class company. Keywords: Construction industry, problems, certification, world-class industrial companyPermalink: http://ejournal.undip.ac.id/index.php/mkts/article/view/3904[How to cite: Hadihardaja, J., 2005, Membangun Industri Konstruksi Indonesia Menjadi Kelas Dunia, Jurnal Media Komunikasi Teknik Sipil, Volume 13, Nomor 2, pp. 11-19]

Pemberdayaan Sumber Daya Air untuk Berbagai Kepentingan Secara Berkelanjutan Sangkawati, Sri; Hadihardaja, Joetata
MEDIA KOMUNIKASI TEKNIK SIPIL Volume 13, Nomor 3, Edisi XXXIII, OKTOBER 2005
Publisher : Department of Civil Engineering, Diponegoro University

Water is essential for human life, for agricultural, industrial production and for water-based recreation and transportation. It is central to many national concern, including energy, food production, environmental quality, and regional economic development. Water as a public comodity which is not have valuable value, this condition will encourage the over consumpsion of the water. In the future, the management of water resources in Indonesia will be more difficult. The water demand will be increased as result population growth, in other hand the water resources will be more rare. The limitation of water supply will be a cause of conflict among community. In accordance of the water resource utilization, which is more and more limited, the water resources should be optimize and integrated and sustained. Privatitation of water resources is not againt the UUD 1945. As long as, the water thatÂ will be offer to other communityÂ as a result ofÂ water surplus of an area. Beside that, it should be improve the welfare of the community Keywords: Sumberdaya air, pengelolaan, pemberdayaan berkelanjutanPermalink: http://www.ejournal.undip.ac.id/index.php/mkts/article/view/3927[How to cite: Sangkawati, S. dan Hadihardaja, J., 2005, Pemberdayaan Sumber Daya Air untuk Berbagai Kepentingan Secara Berkelanjutan, Jurnal Media Komunikasi Teknik Sipil, Volume 13, Nomor 3, pp. 117-127]

KARAKTERISTIK ALIRAN AIR DALAM MODEL SALURAN TERBUKA MENUJU KAJIAN HIDROLIKA EROSI DAN TRANSPOR SEDIMEN Bakhtiar, Bakhtiar; Hadihardaja, Joetata
MEDIA KOMUNIKASI TEKNIK SIPIL Tahun 17, Nomor 2, JUNI 2009
Publisher : Department of Civil Engineering, Diponegoro University

This paper is prepared as a comprehensive resume of results of continuing research of the author at Fluid Mechanics and Hydro dynamics Laboratory,Â DepartementÂ of Civil Engineering, Engineering Faculty, Sangga Buana YPKP University, in collaborating with lecturer team and last year student researchers. The propose of this research is to prove theoretical and mathematical of fluid mechanics and fluid dynamics with observation and measurements to the real water flow in laboratory channel model. Two parts of experiments was done, first allowing water discharge in glass ditch model, and second with add the bottom channel with sand layer. So these research included the difference viscosity of fluids. The results proved that theoretical and mathematical models of fluid mechanics and fluid dynamics characteristic are agreed with experimental observations and measurements in laboratory. Those characteristics included discharge, velocity, flow depth, Froude number, hydraulic radius, and shear stress. Next, these research also propose to be continue to observe the characteristic of sediment transport in water flow. Keywords : Theoretical discharge, theoretical velocity, Froude number, observed discharge, observed velocity, water flow depth, hydraulic radius, shear stress. ABSTRAK Makalah ini merupakan rangkuman hasil pekerjaan penelitian yang dilakukan penulis selama di Laboratorium Mekanika Fluida dan Hidrodinamika Jurusan Teknik Sipil Universitas Sangga Buana YPKP, bersama tim dosen dan para mahasiswa tugas akhir. Tujuan penelitian terutama adalah untuk pembuktian model-model teoritik melalui pengamatan langsung aliran air nyata dalam saluran yang dimodelkan. Dua bagian eksperimen telah dilakukan yaitu dengan saluran kaca dan saluran kaca yang dasarnya dihampar pasir, dengan demikian aliran air pada eksperimen kedua akan membawa pasir, sehingga penelitian ini menguji karakteristik dua aliran dengan viskositas yang berbeda. Hasil menunjukkan bahwa karakteristik aliran air di saluran terbuka yang diturunkan secara teoritik dan didekati dengan model matematik sesuai dengan hasil pengamatan dan pengukuran pada model saluran di laboratorium. Karakteristik yang terbuktikan menyangkut debit, kecepatan, kedalaman aliran, bilangan Froude, jari-jari hidrolis, dan tegangan geser. Penelitian ini ditujukan pula untuk mendalami aspek transportasi sedimen, sebagai penelitian lanjutannya. Kata kunci: Debit teoritik, kecepatan aliran teoritik, bilangan Froude, debit pengamatan, kecepatan aliran pengamatan, kedalaman aliran pengamatan, jari-jari hidrolis, tegangan geser.

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