Study on load allocation of land-based total nitrogen in the Bohai Sea

Yanan Wang; Jie Shi; Xiaolu Tian; Haohong Peng; Xiuren Li; Dehai Song; Xinyan Mao; Xianqing Lv

doi:10.1016/j.scitotenv.2024.171470

Study on load allocation of land-based total nitrogen in the Bohai Sea

Sci Total Environ. 2024 May 1:923:171470. doi: 10.1016/j.scitotenv.2024.171470. Epub 2024 Mar 5.

Authors

Yanan Wang¹, Jie Shi², Xiaolu Tian¹, Haohong Peng¹, Xiuren Li¹, Dehai Song¹, Xinyan Mao³, Xianqing Lv¹

Affiliations

¹ Frontier Science Center for Deep Ocean Multispheres and Earth System (FDOMES) and Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China.
² Key Laboratory of Marine Environment and Ecology, Ministry of Education of China, Ocean University of China, Qingdao 266100, China; College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China.
³ Frontier Science Center for Deep Ocean Multispheres and Earth System (FDOMES) and Physical Oceanography Laboratory, Ocean University of China, Qingdao 266100, China. Electronic address: maoxinyan@ouc.edu.cn.

PMID: 38453082
DOI: 10.1016/j.scitotenv.2024.171470

Abstract

Total nitrogen (TN) is one of the terrigenous pollutants in the Bohai Sea. A reasonable releasing scheme can effectively improve the seawater quality. Based on the observed TN concentrations and the national pollution control requirements, the TN load ratios of four major rivers around the Bohai Sea are adjusted in multiple levels within the range of 50 %-200 % in the frame of total control. Then, a pollutant transport model is used to evaluate each load allocation scheme by calculating the area of different seawater qualities. The optimum scheme is loads of the Yellow River and Luan River are set to 50 % and 200 % of the levels in 2018, and thus the area of heavily polluted seawater can be decreased by 33.14 %. Additionally, the reasonable TN reduction amounts of four major rivers in 2018-2020 are calculated according to the optimum scheme, which can be provided as a decision-making basis of marine managements.

Keywords: Bohai Sea; Load allocation; Numerical simulation; TN; Total control.