Wardah Putri, Komang Arya Utama, Rawiyah Husnan

EVALUASI ANGKUTAN SEDIMEN MELAYANG PADA SUNGAI BONE DI PROVINSI GORONTALO

Introduction

Evaluasi angkutan sedimen melayang pada sungai bone di provinsi gorontalo. Evaluasi angkutan sedimen melayang Sungai Bone, Gorontalo, untuk mengatasi pendangkalan muara. Bandingkan pengukuran sesaat & metode empiris (Lane, Einstein, Chang Simon) untuk laju sedimen tahunan.

Abstract

Sungai Bone mengalami pendangkalan di bagian muaranya. Tingginya angkutan sedimen melayang pada Sungai Bone terlihat dari kondisi fisik air yang keruh di sepanjang tahun baik musim kemarau maupun penghujan yang disebabkan oleh banyak faktor diantaranya erosi. Penelitian ini bertujuan untuk mengevaluasi besar laju angkutan sedimen melayang pada daerah hulu, tengah, dan hilir  Sungai Bone. Metode penelitian yang dilakukan yaitu dengan membandingkan pengukuran sesaat dan tiga Metode Empiris berupa Metode Lane and Kalinske, Metode Einstein dan Metode Chang Simon and Richardson. Pengambilan sampel yang dilakukan di lapangan berupa sampel sedimen melayang, sampel sedimen dasar dan pengukuran hidrometri pada sungai. Sampel diuji di Laboratorium untuk mendapatkan parameter yang diperlukan pada formulasi yang dipilih. Hasil perhitungan laju angkutan menggunakan Metode Sesaat berkisar antara 925,40-1.179,81 ton/tahun, menggunakan metode Lane and Kalinske berkisar antara 2.180,51- 3.492,05 ton/tahun, menggunakan Metode Einstein berkisar antara 22,23-33,32 ton/tahun, dan menggunakan Metode Chang Simon and Richardson berkisar antara 45,12-68,35 ton/tahun. Persentase beda perbandingan hasil perhitungan antara Metode Sesaat terhadap Metode Empiris sebesar 152,55% lebih besar untuk Sesaat-Lane and Kalinske, 97,52% lebih kecil untuk Sesaat-Einstein dan 94,99% lebih kecil untuk Sesaat-Chang Simon and Richardson.

Review

The paper "EVALUASI ANGKUTAN SEDIMEN MELAYANG PADA SUNGAI BONE DI PROVINSI GORONTALO" addresses a critical environmental issue: the sedimentation and shoaling of the Bone River estuary, evidenced by its persistently turbid waters throughout the year. The study's clear objective is to evaluate the magnitude of suspended sediment transport rates across the upstream, middle, and downstream sections of the river. This research is highly relevant given the observed conditions and their potential impacts on the river ecosystem and local communities, providing valuable insights into the hydrological processes of Sungai Bone and the factors contributing to its degradation, such as erosion. A significant strength of this study lies in its comprehensive methodology, which compares instantaneous field measurements with three distinct empirical methods: Lane and Kalinske, Einstein, and Chang Simon and Richardson. This multi-method approach allows for a robust cross-validation of results, highlighting the inherent variability and challenges in sediment transport estimation. The findings reveal substantial differences in estimated sediment loads: instantaneous measurements ranged from 925.40-1,179.81 ton/year, while Lane and Kalinske estimated significantly higher rates (2,180.51-3,492.05 ton/year). Conversely, Einstein (22.23-33.32 ton/year) and Chang Simon and Richardson (45.12-68.35 ton/year) yielded considerably lower estimates. These large discrepancies are explicitly quantified, with the instantaneous measurements being 152.55% greater than Lane and Kalinske, but 97.52% and 94.99% smaller than Einstein and Chang Simon and Richardson respectively, underscoring the complexities involved. While the study successfully quantifies the range of suspended sediment transport, the pronounced differences between the instantaneous measurements and the empirical methods present a critical discussion point. This divergence underscores the challenges in accurately modeling sediment transport in complex river systems and suggests that some empirical formulas may not be universally applicable or may require specific calibration for Sungai Bone. A key limitation, based on the abstract, is the lack of a definitive conclusion regarding which method provides the most reliable estimate for this specific river, or a detailed explanation for the observed discrepancies. Future work could focus on validating these methods against a more extensive dataset, perhaps over different hydrological seasons, or exploring the underlying assumptions of each model in relation to the specific characteristics of Sungai Bone. Despite this, the paper provides a foundational assessment of suspended sediment dynamics in Sungai Bone, offering crucial data for local water resource management and contributing to the broader understanding of river morphology and sedimentation processes.

Full Text

Comments

You need to be logged in to post a comment.