Observed Water Exchange Between the South China Sea and Java Sea Through Karimata Strait

2021 ◽  
Vol 126 (2) ◽  
Author(s):  
T. F. Xu ◽  
Z. X. Wei ◽  
R. D. Susanto ◽  
S. J. Li ◽  
Y. G. Wang ◽  
...  
2019 ◽  
Vol 25 (4) ◽  
pp. 225
Author(s):  
Suwarso Suwarso ◽  
Achmad Zamroni ◽  
Moh Fauzi

Perikanan cumi-cumi telah berkembang di Laut Jawa dan Laut Cina Selatan, didukung oleh alat tangkap bouke ami dan cast net dengan armada penangkap skala menengah. Perikanan berkembang sebagai bentuk diversikasi usaha penangkapan beralih target species akibat terjadinya pergeseran trophic level yang berkaitan dengan perubahan ekosistem serta indikasi pergantian populasi dari sumberdaya ‘multi-species’. Kajian distribusi, kelimpahan dan hasil tangkapan Cumi-cumi (Loliginidae) di perairan Paparan Sunda bagian selatan didasarkan pada data monitoring oleh enumerator tahun 2018 terhadap alat penangkap cumi-cumi (bouke ami dan cast net), didukung oleh data pendaratan per kapal di TPI Muara Angke (Jakarta) periode 2012-2018 dan TPI Kejawanan (Cirebon) periode 2008-2018. Observasi lapangan ditujukan untuk mendeskripsikan karakteristik armada, alat tangkap dan aspek operasional penangkapan. Hasil menunjukkan daerah penangkapan cumi-cumi di Paparan Sunda bagian selatan tersebar luas di Laut Jawa dan Laut Cina Selatan, tapi lebih terkonsentrasi di perairan selatan Selat Karimata yang ditunjukkan oleh tingginya intensitas penangkapan (54% dari total trip penangkapan). Namun demikian, secara umum kelimpahan cumi-cumi (ditunjukkan oleh indek kelimpahan CPUE dalam Kg/hari) hampir seragam sekitar 113-133 kg/hari, sedang indek kelimpahan (CPUE) dalam Kg/trip terlihat berbeda. Perbedaan nyata juga terlihat dari total hasil tangkapan cumi-cumi dari Selat Karimata yang mencapai 55% dari total pendaratan cumi-cumi dari paparan tersebut. Secara umum sebagai target species cumi-cumi berkontribusi sebanyak 93% dari total hasil tangkapan pada alat penangkap cumi. Trend kenaikan hasil tangkapan cumi-cumi berlangsung hingga saat ini baik di Muara Angke maupun Kejawanan. Dalam komposisi jenis prosentase cumi-cumi juga menunjukkan semakin tinggi pada hasil tangkapan pukat (cantrang). Hal-hal terkait pengelolaan perikanan cumi sebagai diversifikasi usaha penangkapan dan pengalihan target species juga dibahas.Squids fishery had well developed in the Java Sea and the South China Sea, was supported by the bouke ami and cast net that were using the medium scale boats. The fisheries developed as the fishing diversification over the species target as an impact of the tropic level changes correspond to the ecosystem changes and substitution of fish population from ‘multi-species’ fish resources. Study of distribution, abundance and catch of squid (Loliginidae) in the southern of Sunda Shelf waters was carried out based on daily monitoring data by enumerators (enumeration data) in 2018 of squid fishing gears (bouke ami, cast net and squid fishing) supported by 201 squid landing data at TPI Muara Angke (Jakarta) for the 2012-2018 period and TPI Kejawanan (Cirebon) for the 2008-2018 period. Field observations are intended to describe the characteristics of the fleet, fishing gear and operational aspects of capture. The results showed that the squid fishing area in the southern part of Sunda Shelf was widespread in the Java Sea and the South China Sea, but concentrated in the southern of Karimata Strait as indicated by the high intensity of catch (54% of the total fishing trips). However, in general the abundance of squid (indicated by the CPUE abundance index in kg / day) is almost the same, which is around 113-133 kg / day, while the abundance index (CPUE) in kg / trip looks different. Significant differences were also seen from the total catch of squid from the Karimata Strait which reached 55% of the total squid landings from the Shelf. The catch of squid that occurred until now shows an upward trend, this is as recorded in Muara Angke and Kejawanan. In catch composition, the percentage of squid also showed higher catches on trawlers (cantrang). Matters related to the management of squid fisheries as a diversification of fishing effort and diversion of target species are also discussed.


2019 ◽  
Vol 38 (4) ◽  
pp. 1-11 ◽  
Author(s):  
Zexun Wei ◽  
Shujiang Li ◽  
R. Dwi Susanto ◽  
Yonggang Wang ◽  
Bin Fan ◽  
...  

Ocean Science ◽  
2016 ◽  
Vol 12 (2) ◽  
pp. 517-531 ◽  
Author(s):  
Zexun Wei ◽  
Guohong Fang ◽  
R. Dwi Susanto ◽  
Tukul Rameyo Adi ◽  
Bin Fan ◽  
...  

Abstract. The South China Sea (SCS) and the Java Sea (JS) are connected through the Karimata Strait, Gaspar Strait, and the southern Natuna Sea, where the tides are often used as open boundary condition for tidal simulation in the SCS or Indonesian seas. Tides, tidal currents, and tidal energy fluxes of the principle constituents K1, O1, Q1, M2, S2, and N2 at five stations in this area have been analyzed using in situ observational data. The results show that the diurnal tides are the dominant constituents in the entire study area. The constituent K1 has the largest amplitude, exceeding 50 cm, whereas the amplitudes of M2 are smaller than 5 cm at all stations. The amplitudes of S2 may exceed M2 in the Karimata and Gaspar straits. Tidal currents are mostly of rectilinear type in this area. The semi-major axes lengths of the diurnal tidal current ellipses are about 10 cm s−1, and those of the semidiurnal tidal currents are smaller than 5 cm s−1. The diurnal tidal energy flows from the SCS to the JS. The semidiurnal tidal energy flows from the SCS to the JS through the Karimata Strait and the eastern part of the southern Natuna Sea but flows in the opposite direction in the Gaspar Strait and the western part of the southern Natuna Sea. Harmonic analysis of sea level and current observation also suggest that the study area is located in the antinodal band of the diurnal tidal waves, and in the nodal band of the semidiurnal tidal waves. Comparisons show that the existing models are basically consistent with the observational results, but further improvements are necessary.


2015 ◽  
Vol 12 (6) ◽  
pp. 2831-2861 ◽  
Author(s):  
Z. X. Wei ◽  
G. H. Fang ◽  
R. D. Susanto ◽  
T. R. Adi ◽  
B. Fan ◽  
...  

Abstract. The South China Sea (SCS) and the Java Sea (JS) are connected through the Karimata Strait, Gaspar Strait, and the southern Natuna Sea, where the tides are often used as open boundary condition for tidal simulation in the SCS or Indonesian seas. Tides, tidal currents and tidal energy fluxes of the principle constituents K1, O1, Q1, M2, S2 and N2 at five stations in this area have been analyzed using in-situ observational data. The results show that the diurnal tides are the dominant constituents in the entire study area. The constituent K1 has the largest amplitude, exceeding 50 cm, whereas the amplitudes of M2 are smaller than 5 cm at all stations. The amplitudes of S2 may exceed M2 in Karimata and Gaspar Straits. Tidal currents are mostly of rectilinear type in this area. The major semi axis lengths of the diurnal tidal current ellipses are about 10 cm s−1, and those of the semi-diurnal tidal currents are smaller than 5 cm s−1. The diurnal tidal energy flows from the SCS to the JS. The semi-diurnal tidal energy flows from the SCS to the JS through the Karimata Strait and the eastern part of the southern Natuna Sea but flows in the opposite direction in the Gaspar Strait and the western part of the southern Natuna Sea. Harmonic analysis of sea level and current observation also suggest that the study area is located in the loop band of the diurnal tidal waves, and in the nodal band of the semi-diurnal tidal waves. Comparisons show that the existing models are basically consistent with the observational results, but further improvements are necessary.


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