scholarly journals Prediksi Transport Sedimen di Perairan Teluk Tahuna Kabupaten Kepulauan Sangihe

2020 ◽  
Vol 9 (3) ◽  
pp. 207-214
Author(s):  
Eunike Kumaseh ◽  
Yuliana Varala Tatontos ◽  
Costantein Imanuel Sarapil
Keyword(s):  
Sediment Transport ◽  
Sedimentation Rate ◽  
Sediment Trap ◽  
Research Method ◽  
Soil Mechanics ◽  
River Estuary ◽  
River Mouth ◽  
Measurement Results ◽  
River Mouths

ABSTRAK: Secara geografis, Teluk Tahuna diapit oleh 2 muara sungai yaitu Muara Sungai Tidore, yang dekat dengan Pelabuhan Nusantara Tahuna, dan Muara Sungai Towo’e. Hal ini memungkinkan terjadinya sedimentasi.Sehingga, perlu diketahui besarnya angkutan sedimen yang terjadi di perairan Teluk Tahuna.Metode penelitian yang digunakan yaitu membandingkan metode Engelund-Hansen dengan hasil pengukuran di lapangan. Pengambilan sedimen menggunakan sediment trap dan diukur selama 2 minggu sekali sebanyak 5 kali. Sedimen dibawa ke Laboratorium Mekanika Tanah untuk memperoleh ukuran diameter sedimen. Lokasi penelitian dibagi menjadi 3 stasiun, Stasiun 1 dekat muara sungai Tidore, Stasiun 2 pada bagian tengah perairan, dan Stasiun 3 dekat muara sungai Towoé. Hasil prediksi transport sedimen di Perairan Teluk Tahuna dengan metode Engelund-Hansen yaitu pada Stasiun 1 = 0,00000291(m3/m*s), Stasiun 2 = 0,00000697(m3/m*s), dan Stasiun 3 = 0,00000789(m3/m*s). Perhitungan transport sedimen yang paling tinggi adalah di Stasiun 3. Pengukuran laju sedimentasi yaitu pada Stasiun 1 sebesar 0,0000029 m3/hari, Stasiun 2 sebesar 0,0000053 m3/hari dan pada Stasiun 3 sebesar 0,0000072 m3/ hari. Rata – rata hasil pengukuran yang paling tinggi juga ada di Stasiun 3,yaitu dekat Muara Sungai Towoé. Hasil prediksi Metode Engelund-Hansen hampir sama dengan hasil pengukuran laju sedimen di lapangan. Metode Engelund-Hansen cocok digunakan untuk memprediksi transport sedimen di Perairan Teluk Tahuna. ABSTRACT: Geographically, Tahuna Bay has 2 river mouths, the Tidore river mouth, which is close to the Tahuna Harbor, and Towo'e river mouth. This allows sedimentation. So, it is necessary to know the calculation of sediment transport. The research method is comparing the Engelund-Hansen method with the results of measurements. Sediment rate measured by sediment trap and once in 2 weeks for 5 times. Sediments were taken to the Soil Mechanics Laboratory. The location was divided into 3 stations. The results of prediction of sediment transport in Tahuna Bay with the Engelund-Hansen method are Station 1  = 0,00000291 (m3/m*s), Station 2  = 0,00000697 (m3/m *s), and Station 3  = 0,00000789 (m3/m*s). The highest calculation of sediment transport is at Station 3. The average measurement of sedimentation rate at Station 1 of 0,0000029 m3/day, Station 2 of 0,0000053 m3/day and at Station 3 is 0,0000072 m3/day. The highest average measurement results are also at Station 3, which is near the Towoé River Estuary. The predicted results of the Engelund-Hansen Method are almost the same as those of the sediment rate measurements in the field. Engelund-Hansen Method can be used to predict the sediment transport in Tahuna bay.

scholarly journals Wave-Current Interactions and Infragravity Wave Propagation at a Microtidal Inlet

Proceedings ◽  
2018 ◽  
Vol 2 (11) ◽  
pp. 628 ◽  
Author(s):  
Lorenzo Melito ◽  
Matteo Postacchini ◽  
Alex Sheremet ◽  
Joseph Calantoni ◽  
Gianluca Zitti ◽  
...  
Keyword(s):  
Wave Propagation ◽  
River Estuary ◽  
River Mouth ◽  
Storm Events ◽  
Infragravity Waves ◽  
Short Period ◽  
Mouth Bar ◽  
Pass Through ◽  
River Mouths ◽  
Infragravity Wave

Recent studies have shown that wave blocking occurs at river mouths with strong currents typically preventing relatively short period sea and swell waves from propagating up the river. However, observations demonstrate that lower frequency waves, so-called infragravity waves, do pass through and propagate up the river, particularly during storm events. We present observations from the Misa River estuary of infragravity wave propagation up the river during storm conditions. A model of the complex nonlinear interactions that drive infragravity waves is presented. The results are discussed in the context of an observed river mouth bar formed in the lower reach of the Misa River.

scholarly journals Wave-Forced Dynamics at Microtidal River Mouths

2021 ◽  
Author(s):  
Maurizio Brocchini ◽  
Matteo Postacchini ◽  
Lorenzo Melito ◽  
Eleonora Perugini ◽  
Andrew J. Manning ◽  
...  
Keyword(s):  
Sediment Transport ◽  
Morphological Evolution ◽  
River Mouth ◽  
Dynamic Environments ◽  
Sea Waves ◽  
Literature Evidence ◽  
Waves And Tides ◽  
Mouth Bars ◽  
River Mouths

Microtidal river mouths are dynamic environments that evolve as a consequence of many forcing actions. Under the hydrodynamic viewpoint, river currents, sea waves and tides strongly interact, and their interplay determines specific sediment transport and morphological patterns. Beyond literature evidence, information comes from field observations made at the Misa River study site, a microtidal river along the Adriatic Sea (Italy), object of a long-going monitoring. The river runs for 48 km in a watershed of 383 km2, providing a discharge of about 400 m3/s for return periods of 100 years. The overall hydrodynamics, sediment transport and morphological evolution at the estuary are analyzed with particular attention to specific issues like: the generation of vortical flows at the river mouth, the influence of various wave modes (infragravity to tidal) propagating upriver, the role of sediment flocculation, the generation and evolution of bed features (river-mouth bars and longitudinal nearshore bars). Numerical simulations are also used to clarify specific mechanisms of interest.

Động lực phát triển vùng cửa Sông Hậu (cửa Định An - Tranh Đề)

2008 ◽  
Vol 30 (2) ◽  
pp. 130-135
Author(s):  
Hoa Mạnh Hùng ◽  
Nguyễn Quang Thành ◽  
Phan Thị Thanh Hằng
Keyword(s):  
River Estuary ◽  
River Mouth

Evaluating the dynamics of the Hau River estuary (Dinh An - Tranh De river mouth)

Use of radiometric tools and methods for studies of sediment transport in river mouths

2020 ◽  
pp. 359-363
Author(s):  
B. Shteinman ◽  
Y. Kamenir ◽  
D. Wynne ◽  
A. Shatsov
Keyword(s):  
Sediment Transport ◽  
River Mouths ◽  
Tools And Methods

scholarly journals ANALISIS KECEPATAN JATUH SEDIMEN PADA SUNGAI CIBEET, JAWA BARAT

2021 ◽  
Vol 5 (1) ◽  
pp. 45
Author(s):  
Kevin Wijaya Warsito ◽  
Wati Astriningsih Pranoto
Keyword(s):  
Conceptual Understanding ◽  
Settling Velocity ◽  
Soil Mechanics ◽  
River Estuary ◽  
Sediment Concentration ◽  
Water And Sediment ◽  
Sediment Research ◽  
Hydraulics Laboratory ◽  
The Relationship ◽  
Optimum Salinity

Cibeet River is one of the branch of the Citarum river in West Java province with a length of 101 km. Cibeet River is one of the rivers supplying water and sediment to the West Tarum irrigation channel or known as the Kalimalang. In this research, the sample used was in the form of mud taken at the Cibeet River Estuary. This research is focused on settling velocity which is a parameter for sedimentation in order to improve numerical modeling and conceptual understanding of sediment dynamics, especially mud. Sediment research is carried out in the Soil Mechanics laboratory and Hydraulics laboratory. Bottom withdrawal tube experiments were carried out using 5 types of salinity and 6 kinds of sediment concentrations. The purpose of the study was to obtain settling velocity and compare laboratory results with the Stokes law approach and compare the relationship between settling velocity with sediment concentration and salinity. The optimum salinity is obtained at 15 ‰, and the optimum sediment concentration at 4700 ppm with an average fall speed of 37,28 mm / s. The results from the laboratory are not in accordance with the Stokes law due to the influence of flocculation from the cohesive nature of the mud sediment, so that using the Stokes law approach cannot calculate the velocity of falling sediment on the mud. Keywords: concentration; salinity; sediment; settling velocity AbstrakSungai Cibeet merupakan salah satu anak sungai dari sungai Citarum di provinsi Jawa Barat dengan panjang 101 km. Sungai Cibeet merupakan salah satu sungai pemasok air dan sedimen ke saluran irigasi Tarum Barat atau dikenal sebagai Kalimalang. Pada penelitian ini, sampel yang digunakan berupa lumpur yang diambil di Muara Sungai Cibeet. Penelitian ini difokuskan pada kecepatan jatuh sedimen yang merupakan parameter untuk sedimentasi demi meningkatkan permodelan numerik dan pemahaman konsep dari dinamika sedimen terutama lumpur.  Penelitian ini dilakukan di laboratorium Mekanika Tanah dan laboratorium Hidrolika, memakai bottom withdrawal tube, dilakukan dengan menggunakan 5 macam jenis salinitas dan 6 macam konsentrasi sedimen.  Penelitian ini membandingkan antara hasil laboratorium dengan pendekatan yaitu hukum Stokes serta membandingkan hubungan antara konsentrasi sedimen dengan salinitas. Untuk salinitas didapat optimum pada saat 15‰, dan konsentrasi sedimen yang optimum pada saat 4700 ppm dengan kecepatan jatuh rata-rata 37,28 mm/s. Hasil dari laboratorium tidak sesuai dengan pendekatan hukum stokes dikarenakan adanya pengaruh flokulasi dari sifat sedimen lumpur yang kohesif, sehingga menggunakan pendekatan hukum stokes tidak bisa untuk menghitung kecepatan jatuh sedimen pada lumpur.

Cohesive Sediment Transport in the Jiaojiang River Estuary, China

1998 ◽  
Vol 46 (6) ◽  
pp. 861-871 ◽  
Author(s):  
W.B. Guan ◽  
E. Wolanski ◽  
L.X. Dong
Keyword(s):  
Sediment Transport ◽  
River Estuary ◽  
Cohesive Sediment ◽  
Cohesive Sediment Transport
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