Evolution of Flow Path and Distribution Characteristics of Sediment Deposition in Xixiayuan Reservoir
Xixiayuan Reservoir is a counter regulating reservoir of Xiaolangdi Reservoir,mainly used to counter regulate the unstable water flow discharged from Xiaolangdi Reservoir.This article systematically reviewed the operation mode,inflow water and sediment,flow path evo-lution and sediment deposition distribution characteristics of Xixiayuan Reservoir from 2007 to 2022.The results could provide technological support for optimizing and reducing sedimentation operation of Xixiayuan Reservoir.The results indicate that a)the average annual inflow vol-ume of Xixiayuan Reservoir is about 30.555 billion cubic meters,and the average annual sediment volume is about 134 million tons.The con-tinuous sedimentation of sediment in the reservoir area has caused significant changes in the flow path of the reservoir area.The section from the old bridge of Jiaozhi Railway to the dam front has gradually evolved from four flow paths in the initial stage to one flow path.b)As of Au-gust 2022,the sediment accumulation in Xixiayuan Reservoir is approximately 72.536 million cubic meters,of which the sediment deposition amount from the dam to xxy07 section is about 69.645 million cubic meters.The reservoir has a storage capacity of approximately 18.4 million cubic meters below the flood limit water level of 131.00 m,with sedimentation accounting for 76.71%.The reverse regulation of the reservoir water level between 131.00 m and 134.00 m has a storage capacity of approximately 56.7 million cubic meters,which has been encroached upon by 0.3 million cubic meters.c)The main chemical components of sediment in Xixiayuan Reservoir are SiO2,Al2 O3 and CaO,account-ing for 80.14%of the total composition.The shape of sediment particles is elliptical or square,with an angular factor of less than or equal to 1.30.d)The current beach sedimentation elevation of Xixiayuan Reservoir,which is more than 5.8 km away from the dam,is more than 3 m higher than the designed beach elevation after sedimentation balance.It is recommended that Xixiayuan Reservoir operate when the water lev-el in front of the dam drops below 132.00 m during the sediment discharge period of Xiaolangdi Reservoir to avoid the continuous elevation of the upstream beach surface from encroaching on the counter regulating storage capacity.
evolution of flow pathssedimentationadjusting storage capacitysiltation balanceXixiayuan Reservoir
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