Application of Acoustic Doppler Current Profile (ADCP) to Estimate Suspended Solid Concentration (SSC) During the Tidal Phase, Case Study: Donggala, Palu.

Abstract

Abstract Understanding various types of kite material, known as suspended solid concentration (SSC), affects the strength of the reflected acoustic signal. SSC is a concentrate that floats in a body of water, the character of the increase in concentration is strongly influenced by the transport medium, namely ocean currents and tides. The use of the Acoustic Doppler Current Profile (ADCP) in this study was developed to estimate the SSC at each elevation change in the tidal phase. This study aims to identify the relationship between the intensity of scattering values to estimate SSC, and to compare SSC temporally in the tidal phase. ADCP measurement is implemented at Donggala, Palu Waters to collected tidal behavior and strength signal during 30 days measurement, with 8 layers profile. Data analysis by classifying the relative acoustic backscatter value. The conversion of the scattering value obtained has a range between 20 - 150 db. The classification of scattering is as follows 70-77 db, 65-69 db, and 60-64 db respectively near the bottom, middle and surface waters. The results of the linear echo intensity (db) relationship with SSC observation (10log) have a strong relationship with an accuracy of R values 0.936. The characteristics of SSC at neap tide and ebb current elevation were relatively higher, with concentration values ranging from 80 – 82 mg l-1, while other conditions were 77 – 79 mg l-1. This study concludes that the intensity relationship can estimate SSC with an error of 2.61% with average layer difference concentration 0.59 mg/l.