SELECTIVE TRANSPORT AND ARMOURED LAYER DEVELOPMENT IN NONUNIFORM BED MATERIALS PART 1: NUMERICAL MODEL DEVELOPMENT
Abstract
Pada sungai dengan material dasar sungai tidak seragam, ukuran butir, rapat massa dan keberadaan butirbutir
material terhadap aliran sungai akan sangat mempengaruhi gerak mula masingmasing
butir material
dasar sungai. Aliran sungai akan terlebih dahulu mengangkut material dasar sungai dengan ukuran butir
yang relatif kecil dan tidak terlindungi, sementara butirbutir
dengan ukuran yang lebih besar dan stabil
akan membentuk lapisan perisai di permukaan dasar sungai. Karena angkutan sedimen terpilah,
pembentukan lapisan perisai dan pembentukan corak dasar sungai sangat terkait erat dengan laju
angkutan sedimen, maka kecermatan penyimulasian fenomenafenomena
tersebut akan sangat
mempengaruhi ketelitian analisis kedalaman aliran, laju muatan sedimen dasar, laju angkutan sedimen
layang dan pada akhirnya juga akan mempengaruhi kecermatan analisis perubahan morfologi sungai.
Dalam tulisan bagian pertama ini dibahas dengan detail studi pustaka dan landasan teori untuk
pengembangan model numerik angkutan material sedimen terpilah, prediksi ketebalan lapisan aktif,
mekanisme pertukaran antara material dasar sungai, angkutan sedimen dasar dan angkutan sedimen
layang, pembentukan corak dasar sungai dan pembentukan lapisan perisai pada sungai dengan material
dasar sungai tidak seragam. Verifikasi dan penilaian unjuk kerja model numerik yang didesain diulas dalam
tulisan bagian kedua.
Keywords
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DOI: https://doi.org/10.32679/jth.v2i2.248
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