Numerical Modeling of a Hydrodynamic Accident at an Earth-and-Rockfill Dam on the Dyurso River
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Vol. 54, No. 3, September, 2020
NUMERICAL MODELING OF A HYDRODYNAMIC ACCIDENT AT AN EARTH-AND-ROCKFILL DAM ON THE DYURSO RIVER V. V. Belikov1 and E. S. Vasil’eva2 Translated from Gidrotekhnicheskoe Stroitel’stvo, No. 3, March 2020, pp. 37 – 44.
The main aim of the study was to perform a modeling of a hydrodynamic accident which took place in early August 2002 at an earth-and-rockfill dam near the city of Novorossiysk on the Dyurso River. The study was carried out by applying numerical modeling methods in a two-dimensional plan setting using the STREAM 2D CUDA software package. In this study, the development of a washout affecting an earth dam made of a heterogeneous material was modeled for the first time. Keywords: numerical modeling; shallow-water equation; rainfall flood; earth-and-rockfill dam; break wave.
In August 2002, on the Black Sea coast of the Krasnodar Territory, an intense cyclone led to heavy rains falling over the mountain river basins. In addition to the rains, on the night of August 9th, a tornado passed in Abrau-Dyurso over the valley of the Dyurso River. The water storage reservoir, confined by an earth-and-rockfill dam, overflowed; the water spilling over the crest led to a partial destruction of the dam. The dam crest was washed out to a depth of 4 m over almost the entire width of the dam (up to 150 m). However, the dam was saved from complete destruction by the concrete slabs used to reinforce the upper slope. In addition to a significant natural rainfall flood, the effect of the resultant break wave 1 2
led to the complete flooding of the river floodplain, the destruction of some properties located on the floodplain, the complete or partial destruction of several vine plantations, and several human casualties [1]. The half-destroyed dam is depicted in Figs. 1 and 2. General Information about the Research Object The Dyurso River flows through the central part of the Abrau Peninsula to a length of 14 km, comprising a drainage area of about 53.7 km2 and an annual flow of 0.45 km3 [2]. The slopes of the river and the valley are around 5 – 7 m/km, with a floodplain width alternating from 100 to 200 m and the river width in the middle course (in the area of the dam) and near the mouth equal to 4 – 5 and 8 – 10 m, respectively.
Institute of Water Problems, Russian Academy of Scienses, Moscow, Russia; e-mail: [email protected] Institute of Water Problems, Russian Academy of Scienses, Moscow, Russia; e-mail: [email protected]
Fig. 2. Washed-out dam crest with concrete slabs preventing its complete destruction.
Fig. 1. Downstream view of the half-destroyed dam.
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Numerical Modeling of a Hydrodynamic Accident at an Earth-and-Rockfill Dam on the Dyurso River
Water storage reservoir (Bam Lake) Upper slope of the dam reinforced with concrete slabs
Dam
Bank spillway
Turfed downstream slope of the dam
Dyurso River
In the middle course of the river, at a distance of 7 km from the mouth, an artificial water body comprising the
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