Ứng dụng mô hìnhDelft3D mô phỏng chất lượng nước hồ Búng Bình Thiên, tỉnh An Giang

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Tác giả: Thị Mỹ Truyền Nguyễn, Ngọc Châu Trần

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Môi trường, 2024

Mô tả vật lý: tr.14-17

Bộ sưu tập: Báo, Tạp chí

ID: 382055

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Bung Binh Thien Lake (Bung) is one of the natural freshwater lakes in An Giang province, besides maintaining the freshwater ecosystem and controlling floods, the lake also provides a livelihood for residents through activities including tourism, entertainment and aquaculture. However, Bung water quality has recently declined and affected people's activities in this area. Therefore, to help local agencies in the environmental management field have an overall view of the current water quality status and be able to identify typical polluted areas in the lake. The study has assessed the current state of water quality in the Bung area through two water quality parameters (DO and BOD5 ) using the modeling method. Application of the Delft3D (including Delft3D-FLOW and DELWAQ models) to simulate water quality in the flood season in 2022 and the dry season in 2023. Simulation results of the flow velocity at the Bung were low, the velocity gradually decreased to zero towards the end of the Bung, the water at this location is very calm. The DELWAQ model simulated the spread of pollution from the Binh Di River, which depends greatly on the discharge and flow velocity. The results showed the model is appropriate for simulating the DO concentration in freshwater at Bung. The model has not given good results in simulating the BOD5 concentration as the DO simulation. This is a prerequisite study for further research on the simulation of water quality and ecological environment.in BungHồ (Búng) Bình Thiên là một trong những hồ nước ngọt tự nhiên thuộc tỉnh An Giang, ngoài việc duy trì hệ sinh thái nước ngọt, kiểm soát lũ lụt, hồ còn mang lại nguồn sinh kế cho người dân bằng các hoạt động du lịch, giải trí và nuôi trồng thủy sản. Tuy nhiên, chất lượng nước (CLN) Búng trong thời gian gần đây có xu hướng bị suy giảm và ảnh hưởng đến hoạt động của người dân trong khu vực. Do đó, để giúp các cơ quan, ban ngành cấp địa phương trong công tác quản lý môi trường có một cái nhìn tổng thể về hiện trạng CLN và có thể xác định khu vực ô nhiễm đặc trưng tại hồ, nghiên cứu được thực hiện nhằm đánh giá tổng quan hiện trạng CLN khu vực Búng thông qua hai thông số DO và BOD5 bằng phương pháp mô hình hóa. Ứng dụng mô hình Delft3D (gồm hai mô hình Delft3D-FLOW và DELWAQ) để mô phỏng dòng chảy, CLN Búng vào mùa lũ năm 2022 và mùa khô năm 2023. Kết quả mô phỏng tốc độ dòng chảy tại Búng rất thấp, càng vào sâu trong Búng thì tốc độ giảm dần về 0, nước ở cuối Búng rất tĩnh lặng. Mô hình DELWAQ thể hiện sự lan truyền ô nhiễm từ sông Bình Di vào và phục thuộc rất nhiều vào lưu lượng, tốc độ dòng chảy. Kết quả cho thấy mô hình phù hợp để sử dụng mô phỏng hàm lượng DO trong nước mặt ở Búng. Ngược lại, mô hình chưa thể hiện kết quả tốt trong mô phỏng nồng độ BOD5 như mô phỏng DO. Đây là nghiên cứu tiền đề cho các nghiên cứu tiếp theo về mô phỏng CLN và môi trường sinh thái tại Búng.

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