The application of Arcmap and HEC-RAS in optimizing the operation of Nanhaizi flood detention basin

Abstract

Nanhaizi flood detention basin is an important component of North Canal basin flood control system. To provide support for its optimal operation, the current storage capacity of Nanhaizi flood detention basin was analyzed firstly based on Arcmap, and a two-dimensional hydrodynamic model was established based on HEC-RAS. The results showed that the current storage capacity of Nanhaizi flood detention basin was 2 300 000 m³, which was 300 000 m³ less than the planned storage capacity of 2 600 000 m³ in 50 years. Taking the elk park as a part of the flood detention basin can solve this problem optimally, and it was determined that the new regulating gate was opened when the water surface elevation of the lake reaches 29.75 m, while closed when the water surface elevation of the elk park reaches 29.75 m. In order to ensure the stability of the project, the width of the new connecting channel and regulating gate was determined to be 5 m according to the simulation result. Compared with the curve of water surface elevation to storage, the two-dimensional hydrodynamic model based on HEC-RAS can consider the flow direction and head loss of the water and simulate the actual flow better according to the result.

Keywords

Arcmap / HEC-RAS / flood detention basin / optimal operation