<p class="AbstractText">Bengkulu City is located in the subduction zone of the Indo-Australian and Eurasian plates, so it is prone to earthquake. To anticipate the impact of earthquake, disaster mitigation can be carried out, one of which is a study of the level of rock hardness in the area. This study aims to determine the level of rock hardness based on seismic wave velocity in several rock formations and to determine which rock formations have the potential to cause vulnerability to earthquakes. Field data acquisition uses the seismic refraction method with time-term inversion technique. The data obtained in the field are processed to obtain a 2-D cross-section of the subsurface seismic wave velocity values. The study results show that the level of rock hardness depends on the type of rock formation. The Andesite Rock Formation Unit (Tpan) has the highest level of hardness, while the transitional area between the Alluvium Rock Formation Unit (Qa) and the Swamp Sedimentary Rock Formation Unit (Qs) has the lowest level of hardness.</p>
The equipment of experiment and research of oceanography at the Physics Laboratory of the Faculty of Mathematics and Natural Sciences, Bengkulu University are still very limited of type. One of the oceanography equipment is a current meter to measure the temperature and speed of ocean currents. This equipment has limited data recording which is still manual so that it is prone to human error in its measurement. In an effort to overcome the limitations of the current meter above, in this study a temperature and ocean current velocity data logger was developed. This study aims to develop a data logger and test its effectiveness which was carried out in July – November 2021 with four stages. The first stage is design, including hardware design and software design. The second stage is the manufacturing stage, namely the manufacture of data logger hardware following the system block diagram and software development using Arduino software following the system flow diagram. The third stage is the testing stage, which includes the process of testing system performance, calibration and field testing. The fourth stage is evaluation, namely evaluation of system performance, accuracy of measurement results, and refinement of data loggers. Comparative test of the results of temperature measurements using a data logger and current meter experienced a difference between 0.1 - 0.8 oC. While the current velocity measurement using a data logger and current meter shows a difference between 0.3 – 1 m/s. The data logger has been successfully developed and works well, but its accuracy still needs to be improved by replacing the water velocity sensor with a higher sensitivity.
Muara Sungai Jenggalu merupakan salah satu muara sungai di Kota Bengkulu yang mengalami pencemaran. Penelitian ini mengidentifikasi kadar kualitas air dan indeks pencemaran di Muara Sungai Jenggalu berdasarkan parameter fisika dan kimia. Data penelitian diperoleh berdasarkan pengukuran secara langsung, analisis laboratorium dan perhitungan indeks pencemaran. Pengukuran dilakukan pada 9 titik yang tersebar di Muara Sungai Jenggalu. Data hasil penelitian ini dibandingkan dengan baku mutu PP 82 tahun 2001 tentang pengelolaan kualitas air dan pengendalian pencemaran. Kemudian perhitungan nilai indeks pencemaran untuk mengetahui indikasi pencemaran pada Muara Sungai Jenggalu berdasarkan Kepmen LH Nomor 115 Tahun 2003. Hasil pengukuran kadar salinitas tertinggi sebesar 26,8‰ dan terendah 12,8‰, kadar DO tertinggi sebesar 6,3 mg/l dan terendah sebesar 5 mg/l, kekeruhan tertinggi 5,4 NTU dan terendah sebesar 0,9 NTU, Kadar TDS tertinggi sebesar 872 mg/l dan terendah sebesar 743 mg/l, kadar pH tertinggi sebesar 7,5 dan terendah 7,2 dan suhu tertinggi sebesar 30,7°C dan terendah sebesar 29,1°C. Selain itu nilai kecepatan arus tertinggi sebesar 0.25 m/s dititik 2 dan terendah sebesar 0,1 m/s dititik 7dan titik 8 dan debit air sebesar 139,8 m³/s. Hasil dari penelitian ini menunjukkan nilai indeks pencemaran di Muara Sungai Jenggalu sebesar 1,28 dengan kondisi tercemar ringan.
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