The Effect Of Dynamic Loads On The Sediment Settlement In The Estuary Case Study: Bengawan Solo River

Patriadi, Andi (2021) The Effect Of Dynamic Loads On The Sediment Settlement In The Estuary Case Study: Bengawan Solo River. Doctoral thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pemadatan sedimen akibat pengambilan air tanah, konsolidasi bobot tanah itu sendiri, dan pemantauan penurunan tanah di delta sungai dengan pengukuran geodetik telah dilakukan dalam beberapa penelitian, sedangkan penurunan sedimen di muara diduga terjadi akibat beban dinamis. Penelitian ini bertujuan untuk mengamati petunjuk terjadinya penurunan sedimen akibat variasi pembebanan dan karakteristik lapisan endapan di muara. Penelitian ini didasarkan pada empat data pembebanan dinamis yang akan diteliti, yaitu tekanan tinggi hidrolik, densitas air, transpor sedimen, pengendapan sedimen baru. Head hidrolik telah disimulasikan selama periode dua musim, yaitu musim hujan dan musim kemarau termasuk sebelum dan sesudah Bendung Sembayat dibangun. Densitas air dan transportasi sedimen diamati di lapangan dan laboratorium selama lebih dari satu tahun. Endapan sedimen dianalisis berdasarkan pengamatan transpor sedimen pada dua penampang alur sungai yang sama. Penurunan sedimen diamati pada BH2 dan BH3 yang terletak sebelum dan sesudah percabangan Sungai Lewean dan Sungai Turi, dengan lebar masing-masing 180 m dan 80 m. Tinjauan ini menemukan bukti bahwa beban dinamis mendominasi perubahan tekanan maksimum di BH2 dan BH3 masing-masing disebabkan oleh debit sungai dan pasang surut. Beban dinamis sedimen pada BH2 memberikan kontribusi yang lebih tinggi dari pada BH3 yang hampir tidak ada. Dilihat dari karakteristik lapisan sedimen, BH2 dan BH3 mengendap dalam waktu satu bulan dan dua minggu untuk penurunan masing-masing 2 mm dan 8 mm. Meskipun perubahan pembebanan tidak signifikan, temuan ini dapat lebih memahami kriteria pembebanan dan penurunan sedimen pada lokasi geometrik yang berbeda.
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Sediment compaction due to extraction groundwater, self–weight consolidation, and monitoring the land settlement of the river delta by geodetic measurement has been executed in several studies, while sediment settlement in the estuary is hypothesized due to dynamic loads. The present study is aimed to observe the occurrence clues of sediment settlement due to loading variation and deposit layer characteristics in the estuary. The research is based on four dynamic loading data to examine, i.e., hydraulic head pressure, water density, sediment transport, newly sediment deposition. The hydraulic head has been simulated during a two-season period, i.e., the rainy and the dry season included before and after the Sembayat Weir was constructed. Water density and sediment transport were observed in the field and the laboratory for over a year. Sediment deposition was analyzed based on the sediment transport observation at two cross-sections of the same river channel. Sediment settlement was observed at BH2 and BH3 located before and after the Lewean and Turi River branches, and the width is 180 m and 80 m, respectively. This review found evidence that dynamic loads predominated maximum pressure changes at BH2 and BH3 were due to river discharge and tidal occurrence, respectively. The dynamic load of sediment at BH2 contributed higher than BH3 that almost non-existent. Looking at sediment layer characteristics, BH2 and BH3 settled in a month and two weeks for 2 mm and 8 mm settlements, respectively. Despite insignificant loading changes, these findings can better understand the loading criteria and sediment settlement on the different geometric locations.

Item Type:	Thesis (Doctoral)
Uncontrolled Keywords:	kriteria pembebanan sedimen; karakteristik lapisan sedimen; penurunan sedimen; sedimen terkompaksi; stragrafi sedimen, sediment loading criteria; sediment layer characteristics; sediment settlement; compacted sediment, sediment stratigraphy
Subjects:	Q Science > QE Geology > QE571 Sedimentation and deposition. Sediment transport. Erosion.
Divisions:	Faculty of Civil, Planning, and Geo Engineering (CIVPLAN) > Civil Engineering > 22001-(S3) PhD Thesis
Depositing User:	Andi Patriadi
Date Deposited:	01 Sep 2021 04:06
Last Modified:	01 Sep 2021 04:09
URI:	http://repository.its.ac.id/id/eprint/91630

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