Enhanced Representation of Java Sea Tidal Propagation through Sensitivity Analysis

Abstract

Abstract-Java Sea is a very complex tidal region due to its associated intrinsic geometrical characteristics which include coastline geometry, small islands and sharply varying bottom topography. Several numerical modelling studies have been conducted to evaluate the tidal characteristics of Java Sea. The present modelling study is an attempt to enhance the representation of tidal propagation of Java Sea by performing sensitivity analysis using Delft3D. Several simulations were done with Manning (0.015, 0.018 0.02, 0.03, 0.032 and 0.035) and Chezy (50, 55, 60, 65 and 70) bottom roughness coefficients in order to enhance the model performance. In general Java Sea is shallow in nature however based on sensitivity analysis with different bottom roughness coefficients, bottom roughness coefficients map was created and applied in combination with varying spatial wind to understand its effect on tidal propagation. The model performance has been verified by comparing with observed amplitudes and phases of M2, S2, K1, O1 tidal constituents at several locations on southern and northern coast of Java Sea. The root mean square error (RMSE) between observed and modelled amplitudes were 0.05, 0.04, 0.06, 0.04 calculated for M2, S2, K1 and O1 tidal constituents respectively at northern coast. Similarly, the maximum RMS error between observed and modelled phase of 34.07 was calculated for S2 tidal constituent. Most importantly, model results clearly indicated bottom roughness coefficients of 0.02, 0.03, 0.032 and 0.035 largely influencing the semi-diurnal tidal harmonic constituents compared to diurnal tidal constituents. However, the spatial varying wind had minimal effect on amplitude and phase. The present study clearly indicates that the assessment of tidal propagation in such a shallow water environment could be enhanced through detailed sensitivity analysis.

Mapping Impact of Tidal Flooding on Solar Salt Farming in Northern Java using a Hydrodynamic Model

“…Currently, the impact of tidal flood is usually modeled using planar approach in geographic information analysis. This approach assumes areas lower than a particular elevation to be inundated utilizing digital elevation model (DEM) and geographic information system (GIS) Tidal hydrodynamics in the Java Sea are complicated, due to their rough shallow bottom topography, diverse types of coastlines, and the interference of tidal waves propagating from the Pacific Ocean, Indian Ocean, and South China Sea [18]. Koropitan and Ikeda [19] previously investigated the implication of the barotropic tides into four tidal harmonic constituents using a three-dimensional (3D) hydrodynamic model combined with observation data and have suggested that the semi-diurnal M 2 component dominates over Java Sea.…”

“…Koropitan and Ikeda [19] previously investigated the implication of the barotropic tides into four tidal harmonic constituents using a three-dimensional (3D) hydrodynamic model combined with observation data and have suggested that the semi-diurnal M 2 component dominates over Java Sea. Several studies show that wind factor has a minimum contribution to tidal propagation in Java Sea [18][19][20]. Tidal flooding in the northern part of Java periodically rises in July and August during the East Monsoon period [21].…”

Identifikasi Arus Pasang Surut di Perairan Kemujan, Karimunjawa Berdasarkan Data Pengukuran Acoustic Doppler Current Profiler

“…Karimunjawa berada di Laut Jawa sehingga kondisi hidrodinamikanya juga dipengaruhi oleh kondisi hidrodinamika Laut Jawa. Sementara itu hidrodinamika pasang surut di Laut Jawa sangat kompleks, yaitu dipengaruhi gelombang pasang yang merambat dari Samudera Pasifik, Samudera Hindia, dan Laut Cina Selatan (Mustaid & Yanagi, 2013;Hasan & Rambabu, 2017…”

“…Pulau Kemujan merupakan salah satu dari 27 gugusan pulau-pulau di Kepulauan Karimunjawa, yang posisinya berada di Laut Jawa. Hidrodinamika pasang surut di Laut Jawa bersifat sangat kompleks, hal ini dikarenakan topografi dasar dangkal yang terjal, garis pantai yang rumit, dan terpengaruh gelombang pasang yang merambat dari Samudera Pasifik, Samudera Hindia, dan Laut Cina Selatan (Hasan & Rambabu, 2017). Penelitian tentang arus di Karimunjawa sudah banyak dilakukan antara lain oleh Ismunarti et al (2016) di Perairan Tanjung Batu Lawang, Karimunjawa, dan Indrayanti et al (2020) di Perairan Pulau Cilik, Karimunjawa; dimana hasil penelitian menunjukkan bahwa perairan tersebut didominasi oleh arus pasang surut.…”