The Water Environmental Quality in Luanhe Estuary-Beidaihe Sea Area

In order to strengthen the mastery of the water environment quality of key sea areas and protect the marine ecological environment, based on the monitoring results of 24 stations, this paper evaluated the water environment quality of Luanhe estuary-Beidaihe sea area from 2015 to 2019 by integrating the evaluation methods of single factor pollution index method, eutrophication index method and organic pollution evaluation index method. The results showed that the overall water quality in the study area was good. Inorganic nitrogen, active phosphate and chemical oxygen demand exceed the standard in varying degrees, but most stations met the class Ⅰ seawater quality standard. In 2015 and 2018, individual stations at the estuary were in eutrophic state, and other years and stations were in oligotrophic state. Except for individual stations near the shore and estuary, the seawater was not organically polluted, the water quality was in about good or good condition, and there was a trend of continuous development.