Phạm Văn Khương (trang 170-176)
Từ khoá: khảo sát, phân cấp, hạn hán, lưu vực, sông Thạch Hãn, Quảng Trị
Drought category of Thach Han river basin, Quang Tri province
Tere are many methods of drought category. Method used is of thermal -hydro coefficients (K) category for drought category of Tahnh Han river basin. Results: drought situation was very serious. Drought happened in both winter-spring and summer-autumn crops. In winter-spring crop, drought occurs at the early and middle crop time. And in summer-autumn season it occurs in June, July and even in August.