Riyan Nurrohman, Agung Setiawan, Muhamad Taufik

Analisis Angkutan Sedimen Dasar (Bed Load) pada Saluran Primer Bendung Kalisemo

Introduction

Analisis angkutan sedimen dasar (bed load) pada saluran primer bendung kalisemo. Teliti angkutan sedimen dasar di Saluran Primer Bendung Kalisemo, Purworejo. Analisis karakteristik sedimen dan volume bed load untuk atasi pendangkalan irigasi. Metode Meyer Peter Muller & Einstein.

Abstract

Saluran Primer Bendungan Kalisemo terletak di Kecamatan Loano, Kabupaten Purworejo. Saluran ini sangat bermanfaat bagi pertanian dan masyarakat sekitar, namun seiring berjalannya waktu saluran ini mengalami pendangkalan sehingga mengakibatkan penurunan debit air irigasi. Penelitian ini bertujuan untuk menganalisis karakteristik sedimen dasar berdasarkan ukuran butir pada Saluran Primer Bendung Kalisemo dan memperoleh volume angkutan sedimen dasar pada Saluran Primer Bendung Kalisemo. Penelitian ini menggunakan metode kuantitatif yang menitikberatkan pada pengumpulan data (pengukuran langsung, pengamatan langsung, dan pengujian sampel sedimen dasar) dan analisis data. Sampel sedimen dasar diambil pada lima titik di Saluran Primer Bendung Kalisemo. Analisis volume angkutan sedimen dasar dilakukan dengan menggunakan Metode Meyer Peter Muller dan Metode Einstein. Hasil analisis menunjukkan bahwa karakteristik sedimen dasar berdasarkan ukuran butir pada Saluran Primer Bendungan Kalisemo dari yang terbesar hingga yang terkecil yaitu kerikil sedang, kerikil halus, kerikil sangat halus, pasir kuarsa, pasir sedang, pasir halus, pasir sangat halus, dan lanau. Volume angkutan sedimen dasar di Saluran Primer Bendungan Kalisemo dengan Metode M.P.M sebesar 3,02 m3/hari dan dengan Metode Einstein sebesar 0,8668 m3/hari.

Review

This study addresses a pertinent issue of canal sedimentation in the Kalisemo Dam Primary Canal, which is crucial for local agriculture in Purworejo Regency. The identified problem of reduced irrigation water due to canal shallowing provides a strong practical motivation for the research. The paper's objectives, aiming to characterize bed sediment properties and quantify bed load volume, are clearly stated and directly relevant to understanding and mitigating the observed problem. This foundational analysis of sediment characteristics and transport rates is a critical first step towards effective canal maintenance and management strategies, making the research valuable for water resource engineers and local authorities. The methodology employed is quantitative, involving direct measurements, observations, and laboratory testing of sediment samples collected from five points along the canal. The use of two established methods, Meyer Peter Muller (MPM) and Einstein, for calculating bed load volume is a robust approach, though the significant discrepancy between their results (3.02 m³/day via MPM vs. 0.8668 m³/day via Einstein) warrants further discussion within the full paper regarding the applicability and sensitivity of each method to the specific canal conditions. The detailed characterization of sediment types, ranging from various grades of gravel to sand and silt, provides valuable insight into the nature of the material contributing to the canal's shallowing. While the abstract effectively outlines the problem, methodology, and key findings, the full paper would benefit from an expanded discussion on several fronts. Firstly, a deeper analysis of the considerable difference in bed load volumes derived from the MPM and Einstein methods is essential, potentially exploring the underlying assumptions of each model and their relevance to the Kalisemo canal's hydraulic characteristics. Secondly, the abstract provides the calculated volumes but lacks context regarding their implications for canal maintenance frequency or the economic impact of dredging. Finally, an interpretation of whether these transport rates are considered high or low for a primary irrigation canal of this type, and how they compare to similar systems, would significantly enhance the study's practical utility and broader scientific contribution.

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