Suspended particulate matter concentration in response to tidal hydrodynamics in a long mesotidal floodway

Xiao, Chenchao; Kawanisi, Kiyosi; Sawaf, Mohamad Basel Al

doi:10.1016/j.ecss.2019.106525

Cited by 8 publications

(5 citation statements)

References 38 publications

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“…Our results for the total flux between Stations A, B, and C indicated the existence of a turbidity maximum zone in the Ota Diversion Channel. Figure 9f shows the convergence of the total flux near Station B at mid-depth during spring tide, supporting the findings of Xiao et al [29]. Our findings suggest that the existence of a convergence zone in the Ota Diversion Channel is more likely to be caused by the total subtidal flux, which is strongly affected by baroclinic flow, rather than simply by river and tidal forcing.…”

Section: Discussionsupporting

confidence: 89%

“…The compound cross-sectional channel spans 6 km downstream of the Gion Floodgate, and a single cross-sectional channel spans 3 km downstream of the compound channel. Generally, the bed materials in the Ota Diversion Channels are dominated by silt and clay, with an increasing proportion of finer particles closer to the river mouth [28,29]. Additionally, under normal conditions, the suspended sediment concentration in the Ota Diversion Channel does not exceed 100 g/m 3 [23].…”

Section: Field Sitementioning

confidence: 99%

“…When the gauging station at Yaguchi reports a discharge of greater than 400 m 3 /s, the Gion Floodgate is fully opened. Xiao et al [29] classified the Ota Diversion Channel as having moderate estuarine circulation because it is influenced by limited runoff and mesotidal flow from Hiroshima Bay.…”

Section: Field Sitementioning

confidence: 99%

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Subtidal Dynamics in a Tidal River with Limited Discharge

Gusti

Kawanisi

Sawaf

et al. 2022

Water

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Investigating subtidal friction and mass transport is pivotal for examining subtidal dynamics in tidal rivers. Although the behavior of subtidal friction and transport has been discussed in recent years, most studies have been conducted on tidal rivers that are affected by high amounts of river runoff. The aim of this study is to offer an initial understanding of the spatial and temporal behaviors of subtidal friction and subtidal flux in a tidal river channel with limited river runoff. This study utilized the frequency domain and theoretical decomposition analyses to determine the dominant tidal and subtidal mechanisms. Frequency domain analysis indicated the dominance of semidiurnal and diurnal tides in the observed tidal river channel. The rate of energy transfer owing to shallow water interaction was found to be stronger for the current velocity than for the water elevation. Decomposition analysis showed that subtidal friction and flux in a low-discharge tidal river channel were largely influenced by subtidal flow-induced subtidal friction and Eulerian return flux, respectively. The key findings of this study are as follows: (i) the limited amount of river runoff (4–20 m3/s) leads to the vertical variability of subtidal friction contributions from subtidal flow and subtidal-tidal interaction, as well as Eulerian return flux, and (ii) the vertical variability of the aforementioned terms can be associated with the existence of influential longitudinal subtidal density gradients along the tidal river. We believe that these findings advance our understanding of subtidal dynamics in tidal river systems, particularly those with limited discharge.

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Section: Discussionsupporting

confidence: 89%

Section: Field Sitementioning

confidence: 99%

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Subtidal Dynamics in a Tidal River with Limited Discharge

Gusti

Kawanisi

Sawaf

et al. 2022

Water

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“…The tidal range is up to 2-3.5 in the semi-diurnal tidal regime. The gate controls the discharge, with the normal discharge being around 20-100 m3/s (Danial et al, 2019;Xiao et al, 2020). The average bottom topography is approximately 3 m. Moreover, the Ota River is a branching delta.…”

Section: Observation Location and Datamentioning

confidence: 99%

Sensitivity of Junction Width to Tidal Nonlinearity on Small and Shallow Tidal Junction

Khadami

Kawanisi

Sawaf

et al. 2022

Indonesian J. Sci. Technol

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Observations of water elevation in the short and small tidal junctions of the Ota River, Japan, showed an increase in tidal nonlinearity at the apex of the junction. To quantitatively estimate the increase in nonlinearity, the barotropic hydrodynamic model was applied in an idealized junction domain, inspired by the Ota River Estuary junction. Even though the model was simplified, it successfully reproduced the increase in nonlinearity at the junction apex. A sensitivity analysis of tidal nonlinearity to the width of the upstream channel at the junction was performed by varying the upstream channel width from the same width as the branch channel width to three times the branch channel width. The relationship between the upstream channel width at the apex and tidal nonlinearity was not linear. Tidal nonlinearity was maximized when the apex width was twice the branch channel width. The convergence of the tides in the small width junction induced an increase of some positions of quarter-diurnal tidal constituent that raised the tidal nonlinearity. In the case of a wider channel, the flushing from river runoff dampen the tidal constituents, making it decrease tidal nonlinearity

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“…Sementara di stasiun 1 (badan sungai) dengan kondisi aliran air sungai yang lebih tenang (penelitian dilakukan saat musim kemarau) memungkinkan suspensi terendapkan ke dasar perairan, sehingga nilai konsentrasi TSS diketahui rendah di stasiun 1. Hal ini sesuai dengan Xiao et al, (2020) yang menyatakan, bahwa distribusi TSS atau MPT di kolom air merupakan hasil dari kombinasi proses-proses erosi, pengendapan atau deposisi dan transportasi. Konsentrasinya dapat bervariasi berdasarkan skala waktu dan tempat.…”

Section: Hasil Dan Pembahasanunclassified

Korelasi Konsentrasi Mikroplastik dengan Material Padatan Tersuspensi (MPT) di Perairan Delta Sungai Bodri, Kendal, Jawa Tengah

et al. 2022

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The Bodri river flow in Kendal Regency is a transportation route for sedimentary materials, waste disposal or garbage resulting from human activities on land to sea waters. One type of waste that is often found is plastic packaging. Until now, the use of plastic products is still high in society. In the environment, plastic waste (including that used for packaging) is difficult to decompose or degrade, but only fragmented into smaller sizes called microplastics. Microplastics (particle size < 5 mm) are widely distributed throughout aquatic ecosystems. Microplastics are one of the pollutants that can affect the food cycle for organisms in coastal and marine areas. This study was aimed to determine the relationship between the concentration of microplastics and suspended solids (MPT) at high tide and low tide. A total of 16 water samples were taken from eight (8) purposively determined stations. Sampling was carried out in July 2019 (dry season) during high and low tides. The research method used was descriptive quantitative. The concentration of microplastics was determined by the method recommended by NOAA, while the determination of the concentration of MPT was carried out by the gravimetric method. The results showed that the average concentration of microplastics at high tide was 2.207 mg/L compared to 2.615 mg/L at low tide. The average MPT concentration at high tide is 193 mg/L lower than at low tide, which was 419 mg/L. It could be said that the high mean concentration of microplastic and MPT at low tide indicated that more microplastic and MPT sourced from the mainland. By the statistical test using the Pearson correlation method, the relationship between microplastics and MPT was in the weak category. MPT affected the presence of microplastics only by 3.19% (with a coefficient of determination of 0.0319 and a p-value of 0.508). The presence of microplastics was not only caused by the presence of MPT, but was mostly thought to be influenced by other factors. Aliran sungai Bodri di Kabupaten Kendal menjadi jalur transportasi bahan sedimen, buangan limbah atau sampah hasil dari aktivitas manusia di daratan menuju ke perairan laut. Salah satu jenis buangan sampah yang banyak dijumpai adalah plastik kemasan. Sampai sekarang, penggunaan produk plastik masih tinggi di masyarakat. Di lingkungan, sampah plastik (termasuk yang digunakan sebagai kemasan) sulit terurai, tetapi hanya terfragmentasi menjadi ukuran yang lebih kecil yang disebut mikroplastik. Mikroplastik (ukuran partikel < 5 mm) tersebar luas di seluruh ekosistem perairan. Mikroplastik menjadi salah polutan yang dapat mempengaruhi siklus makanan bagi organisme di wilayah pesisir dan laut. Penelitian ini bertujuan untuk mengetahui hubungan antara konsentrasi mikroplastik dengan material padatan tersuspensi (MPT) pada saat pasang dan surut. Sebanyak 16 sampel air diambil dari 8 stasiun yang ditentukan secara purposif. Pengambilan sampel dilakukan pada bulan Juli 2019 (musim kemarau) saat pasang dan surut. Metode penelitian yang dilakukan adalah deskriptif kuantitatif. Konsentrasi mikroplastik ditentukan dengan metode yang direkomendasikan oleh NOAA, sedangkan penentuan konsentrasi MPT dilakukan dengan metode gravimetri. Hasil penelitian menunjukkan, bahwa rerata konsentrasi mikroplastik saat pasang lebih rendah yaitu sebesar 2,207 mg/L dibandingkan saat surut yaitu sebesar 2,615 mg/L. Rerata konsentrasi MPT saat pasang lebih rendah yaitu sebesar 193 mg/L dibandingkan saat surut yaitu sebesar 419 mg/L. Dapat dikatakan bahwa tingginya nilai rerata konsentrasi mikroplastik dan MPT pada saat surut mengindikasikan kalau mikroplastik dan MPT lebih banyak berasal dari daratan. Dari uji statistik dengan metode korelasi Pearson, hubungan antara mikroplastik dengan MPT termasuk kategori lemah. MPT mempengaruhi keberadaan mikroplastik hanya sebesar 3,19% (dengan koefisien determinasi sebesar 0,0319 dan p-value 0,508). Keberadaan mikroplastik tidak hanya disebabkan oleh adanya MPT, tetapi sebagian besar diduga dipengaruhi oleh faktor-faktor lain.

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Suspended particulate matter concentration in response to tidal hydrodynamics in a long mesotidal floodway

Cited by 8 publications

References 38 publications

Subtidal Dynamics in a Tidal River with Limited Discharge

Subtidal Dynamics in a Tidal River with Limited Discharge

Sensitivity of Junction Width to Tidal Nonlinearity on Small and Shallow Tidal Junction

Korelasi Konsentrasi Mikroplastik dengan Material Padatan Tersuspensi (MPT) di Perairan Delta Sungai Bodri, Kendal, Jawa Tengah

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