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All Journal Civil Engineering Forum Teknik Sipil International Journal of Renewable Energy Development Indonesian Journal of Educational Assesment
Nizam Nizam
Jurusan Teknik Sipil dan Lingkungan Fakultas Teknik UGM
Chemistry Civil Engineering, Building, Construction & Architecture Education Energy Environmental Science Languange, Linguistic, Communication & Media Mathematics Social Sciences Other

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ANALISIS HIDRAULIKA BANJIR TUKAD BADUNG Wiarta, I Nyoman; Yulistiyanto, Bambang; Nizam, Nizam
Civil Engineering Forum Teknik Sipil Vol 18, No 2 (2008): MEI 2008
Publisher : Civil Engineering Forum Teknik Sipil

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (205.097 KB)

Abstract

There is densely populated residence along Tukad Badung reach resulting in the misuse of stream for waste disposal outlet. This condition causes the stream becoming the disposal place of waste, household sewage, and industrial waste. Also, there is erosion and sliding of river bank in the upstream. This condition also causes river reaches to shallow due to sedimentation resulting in the decrease of stream capacity to carry off the flood discharge. During recent years, Tukad Badung has been degraded in its function due to various factors occurring from the upstream to downstream resulting in the stream incapable to carry off the flood discharge optimally. The change of land use occurred in the watershed causes the change in stream flow pattern that can be seen from the high discharge fluctuation during rainy and dry seasons. The objective of this study is to observe 50 year return period flood water surface profile and to determine the flood control alternatives. Hydrology and hydraulic analyses are carried out in the study. Hydraulic modeling of the river system is accomplished using the Hydrologic Engineering Center-River Analysis System (HECRAS) software of version 3.1.2. The stream is assumed to be a single reach using the upstream boundary at AWLR Wangaya and downstream boundary at Nusa Dua estuary dam. The geometric input is conducted for the existing, normalization, and dikes conditions, whereas the flow hydrograph and rating curve are using for upstream boundary and the downstream boundary respectively. Based on the result of hydraulic analysis, the overtopping is occurred at 27 River Stations at the left bank and 23 River Stations at the right bank. The flood controlling by normalization is capable of decreasing flood water surface with the non existence of overtopping both at the left and right banks. The flood controlling by dike is also capable of retaining the flood discharge without the overtopping at the left and right banks. That can be concluded, by normalization or by dike the Tukad Badung is capable of carrying off the 50 year return period flood discharge. Calculation results shows the flood controlling by dike requires cost of Rp 1.118.376.638,35,- and by normalization requires cost of Rp. 1.316.571.000,00,- .
Meningkatkan Capaian Matematika Siswa Indonesia: Kajian Kesalahan Konsep Nilai Tempat Rahmawati, Rahmawati; Nizam, Nizam
Indonesian Journal of Educational Assessment Vol 1, No 1 (2018): IJEA 2018
Publisher : Pusat Asesmen dan Pembelajaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (591.655 KB) | DOI: 10.26499/ijea.v1i1.3

Abstract

Rendahnya hasil siswa Indonesia pada studi internasional sudah umum menjadi konsumsi publik. Setiap kali hasil TIMSS diumumkan, ranking serta skor adalah fokus utama. Namun, diagnosa mendalam untuk menyelami penyebab rendahnya capaian masih jarang dilakukan. Penelitian ini bertujuan untuk menggali salah satu faktor kesalahan umum yang terjadi pada siswa di jenjang pendidikan dasar, khususnya bidang studi matematika. Faktor yang ditelaah adalah (1) buku teks yang digunakan pada pembelajaran dan (2) soal-soal penilaian tingkat kelas yang lazim digunakan. Kesalahan umum dideteksi melalui analisis kuantitatif, sedangkan faktor yang memengaruhi didiagnosis dengan telaah kualitatif. Respon dari sampel 4024 siswa SD/MI kelas 4 pada studi Trend in International Mathematics and Science Study (TIMSS) 2015 digunakan untuk analisis kuantitatif. Hasil analisis kuantitatif menunjukkan siswa terkecoh dan memilih distraktor soal matematika yang sama. Terkecohnya siswa menunjukkan terjadinya kesalahan konsep nilai tempat. Siswa rancu antara nilai tempat, tempat bilangan, dan nilai bilangan. Diskusi kelompok terpumpun untuk menelaah substansi terhadap buku teks menunjukkan terjadinya simplifikasi penjelasan topik nilai tempat. Sedangkan review soal-soal topik nilai tempat pada penilaian kelas mengindikasikan bahwa secara umum, model pertanyaan menggiring hanya pada satu perspektif. Disarankan penggunaan konteks kehidupan sehari-hari untuk topik nilai tempat pada buku teks sehingga siswa mudah memahami konsep yang benar. Selain itu, penggunaan beragam stimulus untuk menilai pemahaman konsep siswa tentang nilai tempat juga diperlukan untuk meluruskan kesalahan konsep yang terjadi.
Numerical Analysis of Velocity Magnitude on Wave Energy Converter System in Perforated Breakwater Setyandito, Oki; Nizam, Nizam; Pierre, Andrew John; Suputra, Gede Dharma; Wijayanti, Yureana; Anda, Martin
International Journal of Renewable Energy Development Vol 11, No 1 (2022): February 2022
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2022.38535

Abstract

Waves are an alternative energy source that can be used for electricity generation. Wave Energy Converter (WEC) system in perforated breakwater is potentially applicable WEC system for coastal area. The magnitude of wave energy generated is determined by the volume of sea water inside the perforated breakwater. This volumetric flow rate is calculated using the flow velocity at perforated holes on the structure slope. Therefore, this research aims to study the velocity magnitude by analyzing the interrelation among wave steepness, wave run-up and relative velocity. The method used consists of applying numeric 3D flow model in the perforated structure of the breakwater with the variation of wave height, wave period and structure slope. The result shows that, the steeper the structure, the bigger is the relative run up (Ru/H). The higher the relative run up, the higher are the relative run-up velocities (V/Vru). As the velocity increase, the volumetric flow rate inside perforated breakwater will be higher, which leads to higher wave energy. Hence, it can be concluded that the higher the velocities (V/Vru), the higher is the wave energy generated.
Co-Authors Anda, Martin Bambang Yulistiyanto I Dewa Gede Dharma Suputra I Nyoman Wiarta Oki Setyandito, Oki Pierre, Andrew John Rahmawati, Rahmawati Wijayanti, Yureana