Open AccessDecreasing and Migration Process of Oil Spill at Sea
Author(s) -
Dongfang Yang,
Haixia Li,
Lin Ding,
Yuan Zhang,
Qi Wang
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/461/1/012089
Subject(s) - bay , submarine pipeline , oceanography , geology , water content , surface water , hydrology (agriculture) , environmental science , geotechnical engineering , environmental engineering
Based on the survey data of Jiaozhou Bay in May, August and October 1992, the migration and variation of PHC content in offshore oil spill in Jiaozhou Bay were studied. In August, Station 2106 at the eastern central Point of Jiaozhou Bay was taken as the source of offshore oil spill, and its PHC content was 0.056 mg/L. A series of concentric circles with different gradients formed around there, and there was a descended distribution trend from the center to the periphery along the gradient. The content of PHC decreased from 0.056 mg/L at the center to 0.024 mg/L in the central water, 0.027 mg/L in the northwest water, 0.041 mg/L in the northeast water and 0.048 mg/L in the southeast water. According to the horizontal absolute loss velocity model of material content, it was calculated that the horizontal absolute loss velocity of PHC content in the surface waters from the eastern central water to the central water of eastern Jiaozhou Bay in August was 0.45 Yang Dongfang absolute number, and it decreased to 0.42 in the northwest water, 0.36 in the northeast water, and 0.29 in the southeast water. According to the horizontal relative loss velocity model of material content, it was calculated that the horizontal relative loss velocity of PHC content in the surface waters from the eastern central water to the central water of eastern Jiaozhou Bay in August was 8.03 Yang Dongfang absolute number, and it decreased to 7.50 in the northwest water, 6.42 in the northeast water, and 5.17 in the southeast water. Therefore, with Station 2106 in the eastern central Point of Jiaozhou Bay as the source of offshore oil spill, there was a descended PHC content distribution trend from the center to the periphery with the horizontal absolute loss velocity of 0.29-0.45 Yang Dongfang absolute number and the horizontal relative loss velocity of 5.17-8.03 Yang Dongfang relative number. The rising PHC content distribution was consistent with that of the horizontal absolute (relative) loss velocity of PHC content: that of the central water < that of the northwest water < that of the northeast water <that of the southeast water. PHC content indicates the variation amount from the source to certain water, namely terminal value. The horizontal absolute (relative) loss velocity of PHC content indicates the variation process from the source to certain water, namely process value. This reveals that both the terminal value and the process value of PHC content present the migration process of PHC content in waterbody. According to the horizontal velocity model of Yang Dongfang material content, the decreasing and migration process of PHC content toward the periphery along the gradient can be calculated and quantified.