Pengaruh Jarak dan Sudut Pemasangan Krib Tipe Impermeabel Terhadap Persentase Gerusan Tebing pada Belokan Sungai dengan Sudut 90°

Sitorus, Abdi Dicky Tri Putra (2022) Pengaruh Jarak dan Sudut Pemasangan Krib Tipe Impermeabel Terhadap Persentase Gerusan Tebing pada Belokan Sungai dengan Sudut 90°. S1 thesis, Universitas Kristen Indonesia.

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Abstract

Fenomena aliran pada belokan sungai memiliki kaitan yang erat dengan perubahan morfologi sungai. Perubahan tersebut berpengaruh pada terjadinya gerusan tebing pada belokan sungai. Berbagai upaya dilakukan dalam meminimalisir terjadinya gerusan tersebut, salah satunya adalah pemasangan krib. Krib merupakan bangunan di sungai yang memiliki fungsi proteksi dinding belokan sungai melalui mekanisme kontrol kecepatan dan arah aliran. Penelitian ini bertujuan untuk (1) mengkaji bagaimana pengaruh pemasangan krib tipe impermeabel terhadap persentase gerusan dan (2) menganalisis pengaruh variasi sudut dan jarak pemasangan krib impermeabel terhadap pengurangan gerusan yang terjadi di belokan sungai. Penelitian dilakukan dengan uji model eksperimental di laboratorium berbasis model open channel flow dengan variasi sudut pemasangan yakni 45°, 90°, dan 135° dan variasi jarak antar krib 5 cm, 10 cm, dan 15 cm. Berdasarkan hasil penelitian diperoleh persentase gerusan tanpa krib sebesar 56%. Pada jarak antar krib 5 cm diperoleh persentase gerusan pada variasi sudut 45°, 90°, dan 135° berurutan 21%; 13%; dan 5%. Pada jarak antar krib 10 cm diperoleh persentase gerusan pada variasi sudut 45°, 90°, dan 135° berurutan 33%; 28%; dan 17%. Kemudian pada jarak antar krib 15 cm diperoleh persentase gerusan pada variasi sudut 45°, 90°, dan 135° berurutan 38%; 30%; dan 21%. Sehingga diperoleh persentase gerusan minimum pada sudut pemasangan 135° dan jarak antar krib 5 cm sedangkan persentase maksimum diperoleh pada sudut pemasangan 45° dan jarak antar krib 15 cm. Dapat disimpulkan bahwa sudut pemasangan krib berbanding terbalik terhadap persentase gerusan sedangkan jarak antar krib berbanding lurus terhadap persentase gerusan. Kata Kunci: Belokan Sungai, Krib Impermebel, Gerusan. / The phenomenon of flow at river bends has a close relationship with changes in river morphology. These changes affect the occurrence of scouring cliffs at river bends. Various efforts have been made to minimize the occurrence of scouring, one of which is the installation of cribs. Krib is a building on a river that has the function of protecting the river bend wall through a speed and direction control mechanism. This research aims to (1) examine how the effect of impermeable crib installation on the percentage of scour and (2) analyze the effect of variations in the angle and distance of impermeable crib installation on reducing scour that occurs in river bends. The study was conducted by testing experimental models in the laboratory based on the open channel flow model with variations in the installation angles of 45°, 90°, and 135° and variations in the distance between the cribs of 5 cm, 10 cm, and 15 cm. From the results of the study, the percentage of scour without krib was 56%. At a distance between the ribs of 5 cm, the percentage of scour at an angle variation of 45°, 90°, and 135° respectively was 21%; 13%; and 5%. At a distance between ribs of 10 cm, the percentage of scour at angle variations of 45°, 90°, and 135° respectively is 33%; 28%; and 17%. Then at the distance between the ribs of 15 cm, the percentage of scour at an angle variation of 45°, 90°, and 135° respectively was 38%; 30%; and 21%. So that it is obtained that the minimum percentage of scour is obtained at the installation angle of 135° and the distance between the cribs is 5 cm while the maximum percentage is obtained at the installation angle of 45° and the distance between the cribs is 15 cm. So, it can be concluded that the angle of the crib installation is inversely proportional to the percentage of scour while the distance between the cribs is directly proportional to the percentage of scour. Keywords: River Bend, Impermeable Krib, Scouring

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