Patent ID: 8843318
Filing Date: 2014-09-23
Classification: G01K,G01N,G01S,Y02A

Abstract:
1. A salinity measuring method for marine surface layers, comprising: a step of estimating a deviation ΔS′ by an ocean wave spectrum estimation unit between effect of an ocean wave on primary scattering intensity RSI 0 ′ of received power observed by a marine radar in a reference time zone and effect of the ocean wave on primary scattering intensity RSI m ′ of received power in a measurement time zone by using data of the ocean wave or a wind velocity in the reference time zone in which electrical conductivity of seawater does not change and data of the ocean wave or the wind velocity in the measurement time zone in which water quality of the seawater is measured; a step of estimating a deviation Δs′ by an electrical conductivity effect estimation unit between the effect of the ocean wave on the primary scattering intensity RSI 0 ′ of the received power in the reference time zone and effect of the ocean wave on primary scattering intensity of the received power in an electrical conductivity variable time zone by using data of the ocean wave or the wind velocity in the reference time zone and data of the ocean wave or the wind velocity in the electrical conductivity variable time zone in which the electrical conductivity of the seawater varies; a step of estimating a regression function f(σ) by the electrical conductivity effect estimation unit of a relationship between primary scattering intensity of the received power obtained by subtracting the deviation Δs′ from the primary scattering intensity of the received power observed by the marine radar in the electrical conductivity variable time zone and electrical conductivity σ in the electrical conductivity variable time zone; a step of estimating a value of electrical conductivity σ c by an electrical conductivity estimation unit in the measurement time zone by using RSI 0 ′−RSI m ′=ΔS′+{f(σ 0 )−f(σ c )}(where σ 0 : electrical conductivity in the reference time zone); a step of calculating electrical conductivity σ(15) by a temperature correction unit when a water temperature is 15° C. by using the value of the electrical conductivity σ c in the measurement time zone; a step of calculating a ratio K 15 by an electrical conductivity ratio calculation unit of the electrical conductivity σ(15) of the seawater to electrical conductivity of a standard solution of a potassium chloride in a standard state of 15° C. and 1 atmosphere by using the electrical conductivity σ(15) when the water temperature is 15° C.; and a step of calculating practical salinity by a salinity estimation unit by using the value of the ratio K 15 of the electrical conductivity.