hai ciia han han?
Huang din:
- Kho han keo dai va tinh trang han han trong mua kho dien ra a nhieu nai. + C) mikn Bac, tai cac thung lung khult gio nhu Yen Chau, Song Ma (San La), Luc Ngan (BSc Giang) mua kho keo dai 3 - 4 thang.
+ CI mien Nam, mua kho k h k nghiet ban. Thai k i kho han keo dai (jgn 4 - 5 thang a dong bing Nam Bo, vung thip Tay Nguyen, 6 - 7 thani a vung ven hikn Cue Nam Trung Bo.
- De han chS bat thiet hai do ban han gay ra chn t6 chuc phong chong tot. Dg phong ch6ng kho han lau dai phai giai quySt bang nhung cong trinh thuy Igi hgp H.
• 8. Viing dong hkng nao & nuoc ta chiu ngap lut manh? Vi sac?
Huang dan:
- Vung d6ng bang chiu ngap lut manh: D6ng bang song Hong va dong bang song Cuu Long.
- D6ng bang song H6ng: Co mua cuong do Ian, tap trung, mat dk thSp, xung quanh c6 de song, de biSn bao bgc, nhieu 6 trung nen chiu ngap lut manh. Ngoai ra, do mat do xay dung cao, lam nuac thoat cham nen muc do ngap lut nghiem trong ban.
- D6ng bang song Cuu Long: Ngap lut dien ra tren dien rgng, khong chi do mua ma con do muc thuy triSu cao. Be mat ddng bang song Cuu Long thSp phang ban d6ng bang song H6ng nen kha nang tieu nuac kern ban va con phu thugc dong trilu.
• 9. d nuo-c ta, lu quet thucmg xay ra of nhirng viing nao va vao thoi gian nao?
Huang dan:
- d rmhn Bac, IQ quet thuang xay ra vao cac thang 6 - 1 0 , tap trung a vung nui phia Bac.
- C) miSn Trung, vao cac thang 10 - 12, lu quet xay ra a nhieu nai tu Ha 1 mh tai Nam Trung Bg.
• 10. Vi sao lu-ong nu-oc thieu hut vao mua kho ff mien BSc khong nhieu nhu" ff mien Nam?
Huang dan:
Vi \h mua kho a miSn Bac c6 mua phun.
• 11. Ncu thoi gian boat dong va hau qua ciia bao ff Viet Nam va bi^n phap phong chong bao.
Huang dan: '*
- Moat dong cua bao a Viet Nam:
+ Tren toan quoc, mua bao: Tu thang V I va ket thiic vao thang X I , bao sorn vao thang V va muon sang thang X I I , nhung cuang do yeu.
+ Bao tap trung nhicu nhat vao thang IX, sau do den cac thang X va thang VIII. long so can bao cua ba thang nay chiem tai 70% so can bao trong toan mua.
+ Miia bao 6f Viet Nam cham dan tu Bac vao Nam.
+ Bao boat dong manh nhat a ven bien Trung Bo. >f + Trung binh moi nam c6 tu 3 ~ 4 can bao do bo vao vung ba bien nuac
ta, nam bao nhieu c6 8 - 10 con bao. i^; - Hau qua cua bao a Viet Nam:
t Gio manh kem theo mua Ian gay ngap lu tren dien rong, lat up tau thuyen tren bien, lam myc nuac bien dang cao gay ngap man vung ven bien.
+ Bao Ion, gio giat manh doi chieu tan pha ca nhUng cong trinh vilng chac nhu nha cua, cong sa, cau cong, cot dien cao the...
- Phong chong bao:
+ D u bao ve qua trinh hinh thanh va huang di chuyen cua bao.
+ Khi di tren bien, cac tau thuyen phai gap rut tranh xa vung trung tam
bao hoac tra wh dat \\hn. (adsbygoogle = window.adsbygoogle || []).push({});
+ Vung ven bien can ciing c6 cong trinh de bien. + Can khan truang sa tan dan khi c6 bao Ion.
+ Chong bao ket hop chong lut, ling a dong bang va chong lu, chong x6i mon a mien nui.
• 12. Neu cac viing hay xay ra ngap lut, lu quet, ban ban a niro'c ta.
Can lam gi dc giam nbc tac bai cua cac loal thicn tai nay?
Huang dan:
- Cac vung thuang xay ra ngap lut, lia quet, han ban:
+ Vung hay xay ra ngap lut: Dong bang song I long, dong bang song Cuu Long, cac vung triang Bac Trung Bo va dong bang ha lun cac song Ian Nam Trung Bo.
+ Vung hay xay ra lu quet: Vung nui phia Bac, nhieu nai tu Ha TTnh tai Nam Trung Bo.
+ Vung hay xay ra han han: Tai cac thung lung khuat gio nhu Yen Chau, Song Ma (Son La), Luc Ngan (Bac Giang) mua kho keo dai 3 - 4 thang. 6 ^Qng bang Nam Bo va Tay Nguyen, thai ki kho ban keo dai d^n 4 - 5 thang. CJ
ven biSn cue Nam Trung Bo, thod ki kho han dai 6 - 7 thang.
- D I giam nhe tac hai ciia cac loai thien tai nay, chung ta can:
+ Quy hoach phat trien cac diem dan cu tranh cac vung lu quet nguy hi^m va quan l i su dung dat dai hop li, ap dung cac bien phap canh tac tren
dit doc hop If.
+ Can to chuc phong chong han han tot. De phong chong kho han lau
dai phai giai quyet bang nhung cong trinh thuy Igi hop l i . + Tich cue trong rung va bao ve rung.
• 13. Of nu-oc ta, dong dat tbu-ong bay xay ra 6' nbirng viing nao?
Huang dan:
Dong dat manh nhat va tap trung nhat a vung Tay Bac, sau do den vung Dong Bac va vung ven bien Nam Trung Bo.
• 14. Neu cac nbicm vu chii yeu ciia Chien lu-ffc quoc gia ve bao ve tai nguyen va moi tru'ong.
Hm'rng dan:
- Duy tri cac qua trinh sinh thai chu yeu va cac he thong song c6 y nghia quyet dinh den dai song con nguofi.
- Dam bao su giau c6 vc von gen, cac loai nuoi trong cQng nhu cac loai hoang dai, c6 lien quan den Igi ich lau dai ciaa nhan dan Viet Nam va cua ca nhan loai.
- Dam bao viec su dung hop l i cac nguon tai nguyen tu nhien, dieu khien viec su dung trong giai han c6 the phuc hoi dugc.
- Dam bao chat lugng moi truong phu hop vai yeu cau ve doi song con nguai. - Phan dau dat tai trang thai on dinh dan so a muc can bang vai kha nang siJ dung hgp l i cac tai nguyen thien nhien.