Analysis of Channel Geometry and Sediment Transport in Palung and Chitlang Watersheds Using GIS

Dhakal, Bhola Nath

doi:10.3126/jhm.v6i1.5490

Cited by 1 publication

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“…Other than natural processes, activities like road construction, mining, over-grazing, deforestation and cultivation on steep slopes have accelerated erosion rates and ultimately increased sediment concentrations in the Himalayas [12]. The sediment loads of Himalayan rivers are amongst the highest in the world, resulting in problems such as the siltation of reservoirs, blockage of river channels, water pollution and degradation of aquatic environments [13]. Insight into these effects can not only improve the knowledge of river processes, but also promote more effective land and water management [14].…”

Section: Introductionmentioning

confidence: 99%

Assessment of Sediment Load of Langtang River in Rasuwa District, Nepal

Chhetri¹,

Kayastha²,

Shrestha³

2016

JWARP

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This paper assesses the sediment load of the glacier fed Langtang River, Nepal from April 2014 to March 2015. Water samples were collected from the centre of the river with a frequency of two samples per each sampling day using the Depth Integration Technique (DIT) on daily basis in the monsoon season, weekly in the pre-and post-monsoon seasons and bi-monthly in the winter season. Suspended sediment concentration (SSC) is calculated from the water samples using filtration followed by oven-drying, and a rating curve is used to calculate daily discharge of the Langtang River. The annual sediment yield is 109,276.75 tons and 37.69, 11.52 and 5.54 tons of sediment is transported per day in the pre-monsoon, post-monsoon and winter seasons, respectively. There is a very high value of 872.86 tons per day in the monsoon season, which contributes the highest sediment load among all of the seasons comprising 83% of the total sediment transport. Diurnal cycle of sediment discharge is clearly seen with higher sediment discharge during the evening than the morning and reaching maximum values of 41.1 kg•s −1 and 61.5 kg•s −1 , respectively. A clock-wise hysteresis loop has been obtained for discharge and sediment discharge where sediment flux is higher in the early monsoon than in the late monsoon for a corresponding discharge.

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Section: Introductionmentioning

confidence: 99%