Nghiên cứu mô hình vật lý lựa chọn giải pháp tiêu năng hiệu quả cho đập dâng Bảy Yển trên sông Kôn - Hà Thanh

Abstract

The downstream water level of the weir, which have a bottom energy dissipation structure, dramatically affects the hydraulic regime, the sequence, and the downstream energy dissipation. The variation of water level downstream could threaten the safety of erosion downstream of the structure and even threaten the stability of the structure.

In recent times, operating the Bay Yen weir (in An Nhon, Binh Dinh province) located in the lower part of the Kone river is a typical example. Due to the lowered downstream water level, the flow was changed suddenly, causing erosion of the dam toe, slope of the talus. The energy dissipation yard was peeling up to nearly 40m2, the scour hole was up to 1.2m deep, and the bank's roof was eroded at Phu Ngoc bridge reinforcement area (downstream of the work).

This paper presents a summary of the research results on the physical model of the flow-sequential hydraulic regime due to the downstream water level change and proposes solutions to ensure the safety of energy dissipation to prevent erosion for the Bay Yen roller dam on the Kone-Ha Thanh River, Binh Dinh.