Water quality measuring method, water quality measuring device, and water quality measuring program for marine surface layers

摘要

To measure salinity and water temperature in a marine surface layer using data obtained by a marine radar, a deviation ΔS' between effect of an ocean wave on received power RSI₀′ in a reference time zone and effect of the ocean wave on received power RSI_m′ in a measurement time zone is estimated, a deviation Δs′ between effect of the ocean wave on the received power RSI₀′ in the reference time zone and effect of the ocean wave on the received power in an electrical conductivity variable time zone is estimated, a regression function f(σ) of a relationship between received power obtained by subtracting the deviation Δs′ from the received power in the electrical conductivity variable time zone and electrical conductivity σ in the electrical conductivity variable time zone is estimated, and a value of electrical conductivity σ_c in a measurement time zone is estimated, thereby calculating practical salinity.