Ứng dụng phương pháp chỉ số biến đổi thủy văn IHA đánh giá biến động dòng chảy sông Đồng Nai dưới tác động của hồ chứa Trị An=Application of the IHA methord (indicators of hydrologic al-teration) to evaluate the impacts of Tri An reservoir on hydrological regime in the downstream of the Dong Nai river basin

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Tác giả: Quang Minh Đỗ, Thị Hòa Lê, Thị Thu Hằng Lê, Thị Hương Lan Phạm

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Tạp chí Khoa học Kỹ thuật Thủy lợi và Môi trường, 2020

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Bộ sưu tập: Metadata

ID: 471255

Thêm vào giỏ

Các chỉ số biến đổi thủy văn (IHA- Indicators of Hydrologic Al-teration) dựa trên 32 thông số theo năm nhóm (cường độ dòng chảy, thời gian, thời gian, tần suất và tỷ lệ thay đổi) đã được sử dụng rộng rãi để đánh giá sự thay đổi thủy văn trong các hệ thống sông. Thời kỳ dòng chảy tự nhiên (1977-1989) được chọn là thời kỳ nền để so sánh với thời kỳ điều tiết (dòng chảy chịu ảnh hưởng bởi sự điều tiết hồ chứa) thông qua 32 thông số biến đổi thủy văn. Kết quả cho thấy hồ chứa Trị An tác động rõ rệt đến chế độ thủy văn hạ lưu công trình, Số lần xuất hiện xung dòng chảy cao tại trạm thủy văn Biên Hòa thời kỳ sau khi có hồ chứa nhỏ hơn so với thời kỳ tự nhiên và ngược lại, số lần xuất hiện xung dòng chảy thấp tại trạm thủy văn Biên Hòa thời kỳ sau khi có hồ chứa lớn hơn so với thời kỳ tự nhiên,điều này cho thấy sự điều tiết dòng chảy của hồ Trị An tác động rõ rệt đến dòng chảy phía hạ du. Từ khoá Biến động dòng chảy, Tác động của hồ chứa, IHA (Indicators of Hydrologic Al-teration)The Indicators of Hydrologic Al-teration (IHA) based on 33 parameters in five dimensions (flow magnitude, timing, duration, frequency and change rate) have been widely used in evaluation of hydrologic al-teration in river systems.The comparison between the “natural period” (1977-1989) and “regulated period” is implemented by using 32 IHA parameters. The results show that Tri An reservoir affects the downstream hydrological regime during the flood season at Bien Hoa station. Meanwhile, the flow in the dry season is mainly influenced by tides. The hydrological regime was adjusted to be less variation with the regulation of Tri An reservoir since 1989 to 1999. However, the water level in flood season has been increased sharply since 2000. The surge of high water level in the flood season with the regulation of Tri An reservoir depicts the increase of tidal water level and the influence of heavy rains on the basin. Keywords Flow regime al-teration, IHA (Indicators of Hydrologic Al-teration).

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