Volume 5, Issue 3, September 2019, Page: 111-120
Sediment Transport Measurement in the Koshi River: Comparison Between Historic and Recent Measurement Results
Mukesh Raj Kafle, Department of Civil Engineering, Institute of Engineering, Pulchowk Campus, Lalitpur, Nepal
Received: Jul. 17, 2019;       Accepted: Aug. 13, 2019;       Published: Sep. 24, 2019
DOI: 10.11648/j.ajwse.20190503.12      View  504      Downloads  111
This study presents the results of sediment transport measurement in the Koshi River with a comparison between historic and recent measurement techniques. Based on the historic sediment measurement data for the period 1948-1981, the yearly sediment load at Barakhshetra varied between 49 and 283 million m3, with an average of 95 million m3. The coarse, medium and fine fraction contribute by respectively 19, 25 and 56% to the total sediment load of the Koshi River. The average total yearly sediment load at Chatra was estimated as 130 million m3, of which about 60 million m3 is bed material load which contributes to the aggradation on the alluvial fan. This historic data relate to measurements with depth-averaged sampler form cableways. Recent practices collect surface sediment samples from the riverbank to estimate the sediment transport in the river, which include the JPO-SKSKI and DHM sediment samples. The average yearly sediment load at Chatara on the basis JPO-SKSKI and DHM measurement correspond to 44.5 million m3 and 57 million m3 respectively. Moreover, a comparison between the percentages coarse, medium and fine sediment for the historical measurements (EDI method) and JPO-SKSKI and DHM measurements (surface sampling near the bank) concluded that sampling from the bank results in a serious underestimation of the contribution of the coarse sediment to the total sediment load of the river.
Sediment Load, Riverbank, EDI, Surface Sampling, Depth-averaged
To cite this article
Mukesh Raj Kafle, Sediment Transport Measurement in the Koshi River: Comparison Between Historic and Recent Measurement Results, American Journal of Water Science and Engineering. Vol. 5, No. 3, 2019, pp. 111-120. doi: 10.11648/j.ajwse.20190503.12
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