Giai phap chong sat lo dat bo song bo bien

Thứ tư, 11 Tháng bảy 2001, 15:24 GMT+7



Cat song Hong chu yeu la lop cat min nen rat de bi xoi lo khi khai thac qua muc.

Nhung ngay dau thang 7, cac vu sat lo bo song, bien da dien ra cung luc o nhieu dia phuong nuoc ta, gay thiet hai nghiem trong den tinh mang con nguoi, pha huy nhieu cong trinh xay dung. Moi day, cac nha khoa hoc da dua ra nhung giai phap cong trinh va phi cong trinh cho hien tuong nay.

Cong nghe ke lat mai: Day la giai phap cong nghe dung cac loai vat lieu ben vung lam lop ao phu phia ngoai, giu cho dat bo khong bi xoi troi, bao ve truc tiep mai lo. Giai phap nay hien duoc dung pho bien va rong rai o hau het cac cong trinh bao ve bo nuoc ta.

Ke lat mai gom 3 bo phan chinh: chan ke, than ke, dinh ke. Chan ke la bo phan nam duoi muc nuoc, dung de bao ve, giu cho chan mai bo on dinh va lam the cho phan than ke o tren. Gan day, nguoi ta da dung cac tam betong hinh chu nhat co kich thuoc phu hop lien ket voi nhau bang khuy moc, tao thanh mang lon hoac cac ket cau betong co hinh dang dac biet xep noi voi nhau theo kieu khop moc tao thanh mang chac chan, rat kho bi bat tung ra khi bi tac dong. Nhung cong nghe nay moi chi duoc ap dung thu nghiem.

Cong trinh giam van toc ven bo: Day la mot giai phap quan trong duoc dung pho bien trong thoi gian qua, nhat la doi voi nhung truong hop van toc ven bo lon, day song sau, mai bo doc lon. Giai phap nay thuong ket hop voi ke lat mai tao nen he thong cong trinh lien hoan co hieu qua chong sat lo bao ve bo tot, duoc ap dung o nhieu noi nhu cong trinh ke Quang Lang, Ham Tu, Ha Xa... Cac cong trinh nay da phat huy hieu qua va to ra thich hop voi dieu kien Viet Nam.

Cong trinh chuyen huong dong chay: Doi voi nhung vung bo bi xoi qua dai, phuong phap bao ve truc tiep co khoi luong cong viec qua lon hoac do cac dieu kien khac kho thuc hien, ta dung giai phap cong trinh chuyen huong chay. Giai phap nay thuong dung he thong mo han huong dong hoac dao luong, cat dong hay dap ngan, gay boi lap lach.

Tuy nhien, giai phap lau dai, hieu qua nhat van la y thuc bao ve moi truong song cua tung nguoi dan. Ton trong quy luat tu nhien cung dong nghia voi viec chung ta tu bao ve cuoc song cua chinh minh. Tuy theo dieu kien cu the cua moi dia phuong ma ap dung cong nghe cho phu hop.

Nguyen nhan sat lo bo song, bo bien

Ngoai yeu to lo, boi tu nhien cua dong song, mot nguyen nhan rat quan trong khac la hoat dong khai thac long, bo song, bo bien qua muc. Cac cong trinh xay dung voi quy mo lon ngay ben bo bien, bo song ngay cang nhieu, hoat dong giao thong van tai nhon nhip... dang lam nghiem trong them tinh hinh xoi lo. Rung dau nguon bi khai thac qua muc cung la mot nguyen nhan dan den viec thay doi che do dong chay va che do bun cat cua he thong song, gay tac dong xau den dien bien long song.

Mat khac, do cau tao long song, nhat la song Hong va he thong song Cuu Long, chu yeu la lop cat min nen rat de bi xoi lo. Vi vay, chi can mot tac dong hay mot thay doi nho cung co the tao su bien dong thuy luc gay bien dong manh long song, bo song.

Hon nua, viec lan chiem bai song lam noi canh tac, xay dung nha cua... cua nguoi dan dang dien ra kha pho bien voi muc do va quy mo ngay cang lon. Co nhung cong trinh tren song nhu cau, ben cang... da lam thu hep dong chay thoat lu, khien toc do chay cua lu manh hon, dan toi xoi lo bo.

(Theo SGGP, 11/7)



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