In-Situ Measurement of Diffuse Attenuation Coefficient and its Relationship with Water Constituent and Depth Estimation of Shallow Waters by Remote Sensing Technique
Diffuse attenuation coefficient, Kd(λ), has an empirical relationship with water depth, thus
potentially to be used to estimate the depth of the water based on the light penetration in the water
column. The aim of this research is to assess the relationship of diffuse attenuation coefficient with
the water constituent and its relationship to estimate the depth of shallow waters of Air Island,
Panggang Island and Karang Lebar lagoons and to compare the result of depth estimation from Kd
model and derived from Landsat 8 imagery. The measurement of Kd(λ) was carried out using
hyperspectral spectroradiometer TriOS-RAMSES with range 320 – 950 nm. The relationship between
measurement Kd(λ) on study site with the water constituent was the occurrence of absorption by
chlorophyll-a concentration at the blue and green spectral wavelength. Depth estimation using band
ratio from Kd(λ) occurred at 442,96 nm and 654,59 nm, which had better relationship with the depth
from in-situ measurement compared to the estimation based on Landsat 8 band ratio. Depth
estimated based on Kd(λ) ratio and in-situ measurement are not significantly different statistically.
Depth estimated based on Kd(λ) ratio and in-situ measurement are not significantly different
statistically. However, depth estimation based on Kd(λ) ratio was inconsistent due to the bottom albedo
reflection because the Kd(λ) measurement was carried out in shallow waters. Estimation of water depth
based on Kd(λ) ratio had better results compared to the Landsat 8 band ratio.
URI
https://repo.itera.ac.id/depan/submission/SB1904020002
Keyword
in-situ measurement diffuse attenuation coefficient relationship with water constituent depth estimation shallow water remote sensing