WATER QUALITY LIMITATION FOR TURBIDITY BASED SEDIMENT MEASUREMENT IN RIVERS

Yıl 2017, Sayı: 1, 383 - 387, 09.11.2017

Ramazan Meral Sebahattin Kaya Azize Dogan Demir Yasin Demir

Öz

The concentration and size of
sediment particles are mainly affected flow and climate conditions, soil
properties, topography, and plant cover properties. The direct water sampling
method has many difficulties to represent continuous monitoring of sediment
transport, especially during extreme flow conditions Turbidity based estimating of suspended sediment is widely used for
river studies due to its simply and cheap using.
The strong relationship between turbidity and suspended sediment concentrations
has led to the use of turbidimetry to estimate sediment concentration. The use
of turbidity values for SSC is an indirect method and based on to determine the
statistical relationship between these values; the relationship could be
linear, non-linear or polynomial. But this relation is affected by water
pollution, colloids and plankton units, air bubbles and other suspended
materials in the water sample rather than mineral suspended particles. In this study, Seapoint Turbidity Meter sensor was used to provide
accurate, reliable, automated and continuous time series of suspended-sediment
concentrations under different water quality conditions in river. The study was
conducted at river conditions, and two different water qualities were
considered depend on electrical conductivity and turbidity values. The first
sampling point was chosen close the source of river for obtaining clear water
and second one was chosen at polluted point by waste water of city. The
regression analyses were applied between the sediment concentrations with the
turbidity values to observe of different water quality effects and were
evaluated using determination coefficient (R²) and regression
equation. Sediment concentration values were varied between 0.02 and 1.12 g/l
during sampling season depend on rainfall and river discharge but these values
and water quality parameters were found extremely high and unstable due to
pollution of waste water pollution of city. 
Fairly high R² value (0.971) was obtained for first station
water which has relatively clear, but week relationship (0.273) was obtained of
between the sediment concentrations and the turbidity values for second station
due to water pollution. This problem is important limitation for turbidity
based sediment measurement, and it should be considered to more accurately estimate sediment concentration
with turbidity values

Anahtar Kelimeler

Suspended sediment, turbidity, water pollution, environmental

Kaynakça

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