INVESTIGATING BEDLOAD DISCHARGE OF RIVERS IN TWO PROVINCES.
2014
Nikkami, Davood | Arabkedri, Mahmood | Sokotiyehoskoei, Reza | Yosefi, Masuod
Eroded soil particles within watershed areas are transported in three shapes of dissolved, suspended and bed loads by river water discharge. Knowing the amount of suspended and bed loads are necessary in estimating sediment yield of watersheds. Usually, suspended load is measured daily in hydrometric stations, while this does not happen for bedload. Although, there are many differences between geology formations, rainfall intensities and water discharges of watersheds, the amount of bedloads are considered as a constant coefficient of suspended load. So, there would be high amount of errors in watersheds sediment load estimates. This research is intended to collect bed and suspended load data of some hydrometric stations and fitting best relations between their bedload and suspended loads. For this purpose, after measuring or collecting data, the best correlations were fitted between bed and suspended loads. In this research, three hydrometric stations of Badlan on Alandchay River, Pole Yazdakan on Qotourchay River and Mazraeh on Baroonchay River all in Western Azerbyjan and Baghan on Baghan River in Boushehr were chosen. According to statistical analysis all data had high coefficient of correlation at the level of 99 percent and the best equations were chosen accordingly. The ratio of bedload to suspended load in Yazdakan, Badlan and Mazraeh stations were 79, 49 and 13 percent and in Baghan station was 0.7 percent, respectively. The average ratio for all three stations in Western Azerbyjan was 46 percent and in all above four stations was 35 percent. Key words: Bedload, River sediment load, Sampling, Sediment transport, Suspended load
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