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36(2), 108 120 Tap chr CAC KHOA HOC VE TRAI BAT ^DANH GIA NGUY CO THIET HAI DO TRl/OT L O DAT GAY RA 0 CAC HUYEN MIEN NUI TINH QUANG NGAI PHAM VAN HUNG Email phamvanhungvdc@gmaiLcom Vien Dia chdt, Vie[.]
36(2), 108-120 Tap chr CAC KHOA HOC VE TRAI BAT ^DANH GIA NGUY CO THIET HAI DO TRl/OT L O DAT GAY RA CAC HUYEN MIEN NUI TINH QUANG NGAI PHAM VAN HUNG Email: phamvanhungvdc@gmaiLcom Vien Dia chdt, Vien Han Idm Khoa hoc va Cong nghe Viet Nam Ngaynhanbai: - - l.Mdaiu Cac huyen midn nui tinh Qudng Ngai ndm vimg cd didu kidn ty nhien rat phiic tap, hang nam phai himg chiu nhirng tdn that khong nhd tai bidn dia chdt gdy ra; dac biet la trugt Id ddt (TLD) dang cd xu hudng ngdy mgt gia tang ca vd quy md va tan sudt xuat hien, de lai nhirng hau qud ndng ne cho cudc sdng ciia ngudi dan Dan cu phan bd tap trung d cac thi trdn va dgc theo cac tryc dudng giao thdng lidn huyen, tinh Tai bien dia chdt (TBDC) ndi chung, TLD ndi rieng cd nguy ca gay thiet hai ldn d mdt sd dja phuong, dnh hudng tryc tiep ddn quy hoach phat tridn bdn viing kinh te - xa hgi (KT-XH) va bao ve mdi trirdng Do vay, nghien ciru TBDC ndi chung, TLD ndi rieng, nghien citu ddnh gid nguy co thiet hai TLD gay la mpt nhiJng ngi dung quan trgng, lam co sd khoa hpc phyc vy quan ly tai bidn, phdng trdnh gidm nhe thiet hai tai bien gay nen Cho den nay, tren dia bdn cdc huyen mien nui linh Quang Ngai chua cd cdng trinh nao nghien ciru danh gia chi tidt nguy co thiet hai TLD gay ra, lam co sd cho quan ly tai bien, phdng tranh gidm nhe thien tai, quy hoach sir dung hop ly tai nguyen lanh thd vd phdt tnen ben viing KT-XH Cdng trinh ndy trinh bdy nhiing kdt qua nghidn cuu budc ddu ve nguy ca thidt hai TLD gdy d cac huydn midn niii tinh Quang Ngai Cff sd tai lieu va phuomg phap nghien ciru Cac tai lieu su dyng de danh gid nguy co thiet hai tai bien TLD gdy bao gdm ban dd nguy CO tai bidn TLD (H) va ban dd kha nang chdng 10 chju tai bidn cua cdc ddi tugng KT-XH (V) Bdn dd nguy CO TLD cdc huydn midn nui tinh Quang NgSi dd dugc lap nam 2013 ty Id 1:50.000 [2] Cac ddi tugng chju tai bidn TLD d viing nui tinh Quang Ngai bidn ddng rdt phdc tap, duoc dua vdo dd ddnh gia nguy eg thidt hai (R) bao gdm: dan cu, cdc cdng trinh kinh td dan sinh, cdc cdng trinh giao thdng, thiiy loi, thiiy didn va tdi nguyen ddt dai Do cd sy bidn ddng cua cac ddi tugng chiu tai bidn, nen cac tai lieu sir dung de danh gia khd nang chju tai bidn TLD ciia cdc ddi tugng KT-XH tinh ddn thang 11 nam 2010 vimg niii tinh Quang Ngai, vide danh gia dua tren eg sd tai lidu quy hoach phat tridn KT-XH tinh Quang Ngai ddn nam 2020 da ditpc Thii tudng Chinh phii phd duyet 20 thang 11 nam 2010 [5] Dd ddnh gia nguy co thiet hai TLD gay ra, cac phuang phap ap dung bao gom: phan tich anh viln thdm, khao sat thyc dia, phdn tich tdng hgp, phan tich so sdnh cap (AHP cua Saaty) [3] vd phan tich khdng gian mdi trudng GIS [7, 8] Bdn dd khd nang chong chiu tai bien cua cdc ddi tugng dugc xay dyng dya tren phan tich danh gia vai trd cua cac ddi tugng chiu tai bien trugt Id va dugc tinh theo cdng thdc sau [5]: '-T.^J'II'^'J Trong do: V - la chi sd khd nang chdng chiu tai bidn trugt Id cua cac ddi tugng, Wj - id trpng sd ciia cac doi tugng thir j , Xij - la gid tn ciia Idp thir i ddi tuong chju trugt j , Vide tich hgp thdng tin mdi trudng GIS vdi phuang phdp phan tich da bidn da cho phep xay dung bdn dd kba nang chdng chju tai bidn TLD gdy nen tren dia ban vung niii tinh Quang NgSi Bdn nguy co thift hai (R) dugc thdnh ldp tren co sd tich hgp thong tin tir cac ban dd nguy co tai bidn (H) vd ban dd kha nang chdng chiu tai bidn cua cdc ddi tugng chiu tai bidn (V) Nhu vay, bdn nguy CO thi^t hai dugc thdnh lap theo cdng thiic sau [8]: R = V * H = f (nguy co tai bien, ddi tugng chju tai bidn) = ^XiYj Trong dd: R la ban nguy ca thj$t h?i, V la ban khd ndng chong chiu tai bidn cua cac ddi tirgng KT-XH, H la bdn dd nguy eg tai bidn, X la diem sd cap nguy ca tai bien i, Y la diem sd cua cap chiu tai bien j Phuang phdp danh gid nguy ca thidt hai da dugc dd cap den nhieu cdng trinh khoa hpc tren thd gidi [1, 3, 8] Tuy nhidn, d nudc ta ddnh gid nguy co thidt hai cdn la van dd mdi vd khd, bdi nh&ng b^t ciip chinh viec xdc djnh ldn vd ludn bidn ddng ciia cac ddi tugng chiu tai bidn Do dd, nhirng ket qud danh gid nguy co thidt hai tai bidn gay ciia nhiing cdng trinh nghien ciru trudc ddy cdn mang tinh djnh tinh Vi v^y, ddnh gid nguy ca thi^t hai, vi?c xdc djnh vai trd ciia tirng ddi tugng KT-XH d dia phuong mdi dimg d muc d$: coi ngudi la tai san vd gid, khdng the tinh dugc bang tidn vd Id doi tugng quan trgng nhdt Do v4y, milt dg ddn cu Id ddi tuong chju tai bidn quan trgng nhdt, tidp ddn la cdng trinh ddn sinh (tai san cua nhd nudc vd nhan ddn), Trgng cdng trinh ndy, t§p thd tac gia ddnh gid nguy co thidt hai TLD gdy trdn ca sd nhiing dir lieu KT-XH hidn cd, cap nhit thdi gian gan day vd budc ddu dugc djnh lugng hoa Ket qud nghien eii'u 3.1 Xdy dung bdn dd nguy ctf thiit hai l& dat gay nen tru^ Trong dieu kidn cdc tdi hdu thdng ke vd cac ddi tugng KT-XH chiu tai bidn TLD d dia phuang ludn bidn dgng, thay ddi hdng nam cdng trinh dd cd gdng cgp nh|it, thu th^p, tdng hgp cdc sd li|u, tdi li?u gdn ddy nhat vd tinh hinh phat trien KT-XH ciJa dja phuang, thd hipn quy ho^ich phat trien KT-XH tinh Qudng Ngai ddn nam 2020 [5] Tren ca sd xem xet tdng hgp cdc hoat ddng KTXH d dja phuang cho thdy, cac doi tugng khu vyc nghidn cihi chju tai bidn, cd thd bj thiet hai TLD gay gdm: dan cu, cdc cdng trinh kinh td dan sinh, dudng giao thdng, cdng trinh thuy didn, thuy lgi va tdi nguyen ddt dai Nhdm dan cu vd cdc cdng trinh kinh te dan sinh bao gdm: cdc cum ddn cu song d cac thi trdn, dpc cdc dudng qudc Ig, tinh Id, lien huydn, lidn xd, lien thdn, cdc cum ddn cu sdng dgc cac sdng sudi, trdn cdc sudn nui d viing mien niii Cdc cdng trinh xay dung dan dung bao gdm: nha d, cac cdng trinh cdng cdng khu vuc nhu trudng hpc, cho, benh vien, tram xd, try sd cac CO quan hdnh chinh; cdc cdng trinh xdy dyng cdng nghidp gom: cdc khu vyc khai thdc khodng san, khu cdng nghiep, ddu Id nhung ddi tugng chiu tdc dgng TLD Nguy co thidt hai se cang cao m^t dp cdng trinh cang ldn Nguy co thidt hai ve vdt chat vd ngudi se cdn ldn hon d day dang cd nhirng boat dgng ddng ngudi Nhdm cdng trinh giao thdng bao gdm: cac QL24, cdc tinh Id 622, 623, 626, cac dudng lidn huyen, lien xa, lidn thdn d vimg mien niii Cdc cdng trinh thiiy didn, thuy lgi, kdnh muang tudi tieu vd cdc cdng trinh phy trg phyc vy cho thiiy dipn, thiiy lgi nhu: nhd xudng, kho bai, tram bam, kenh muang, Tdi nguyen ddt gdm: ddt ddn cu, ddt riing ty nhien, rimg bdo tdn, riing ddu ngudn; rimg trdng, riing sdn xudt, khoanh nudi; dat sdn xudt ndng nghidp: trdng lua, hoa mau, cdy ndng nghidp khac Ddnh gid kha nang chdng chiu tai bidn TLD cdn dugc dya tren CO sd hien trang phat tridn KT-XH cua dja phuang Nhiing ddi tugng KT-XH da dugc cap nhat theo cac sd lieu thdng kd cd thd dugc ddn thdi gian hidn Trong do, ddng chii y nhdt chinh Id yeu td ngudi vd tdng ca sd KT-XH (i) Mat dan sd dugc coi Id ddi tugng quan trgng nhdt ddi vdi tai bien TLD, cho diem, Bdi IS ngudi la ddi tugng nhay cam nhdt cac ddi tugng chju tdc ddng ciia tai bien TLD Miic thidt hai ve ngudi khdng the tinh bang vat chdt nhu nhirng ddi tuong khac, song ve mat xa hpi \^i Id nhiing tdn that khdng thd bii ddp ndi Khi mat dg dan cu cdng cao thi khd nang chdng chju tai bidn cdng kem, ngugc lai, mat ddn sd cdng thdp thi khd nang chong chju tai bidn cang tdt, Cdp m^t dg dan cu rdt ldn Id nai cd mat dg dan cu tap trung Idn hi >200 ngudi/km" nhu: thi trdn Tra Xudn, Di Ldng Nhimg not ndy la noi tap trung phdt trien ddn cu kha manh, bdi ddy Id trung tam hanh chinh huydn Cap mat dg ddn cu ldn la noi cd mat dp ddn 109 cu tiip trung 100-200 ngudi/km nhu: cac xa bao quanh cac thj tran Tra Xudn, Di Ldng vd cac thi trdn khde ciia cdc huyen mien niii tinh Quang Ngai Nhiing nai la nai tap trung phdt trien dan cu ldn, bdi day la trung tdm hdnh chinh huydn Mat dd ddn sd trung binh Id nhirng noi tap trung ddn cu vdi mat dp dan cu 50-100 ngudi/km^ Dd chinh la cdc xa thudc huyen Ba To, Son Hd, Minh Long va mdt sd xa d Trd Bdng va Tay Tra Mat dp ddn sd thdp Id nhiing noi cd mat dp ddn cu 25-50 ngudi/km^ vd rat thap la 152 cdng trinh/km^) la noi cd mat ddn cu tap trung rdt ldn, cdc cdng trinh dan sinh cua Nha nudc, dja phuong ciing tap trung d nhirng nai ndy, nhu: thi trdn Tra Xuan, Di Lang, cac xa Tra Phong, Long Hidp, Son Tan va thj trdn Ba Ta Cdp mat dp cdng trinh kinh te ddn sinh ldn (114-152 Ctr/km^) la ngi cd mat dp dan cu tap trung Idn nhu cac xa bao quanh cdc thi trdn huyen Mat dp cdng trinh kinh td ddn sinh trung binh id nhiJng noi tap trung dan cu vdi mire trung binh, Dd chinh Id cac xa thupc huydn Ba To, Son Ha, Minh Long va mpt sd xa d Tra Bong va Tdy Tra Mat dp cdng trinh kinh td ddn sinh thap, rat thap la nhirng noi cd mat dp dan cu thap vd rat thap Tiiy thudc vao mat dp cdng trinh kinh te dan sinh, cd thd chia lam cdp: rdt tdn, ldn, trung binh, nhd va rat nhd va tuong img la cap dp chiu tai bidn rdt kem, kem, trung binh, tdt va rat tdt Diem ciia cac cdp kha nang chdng chiu tai bien nhu sau: rat tdt (r^ NGHiA HANH T \ y /r^^r-k ^'^S^ X ; yssrM^i '~v5>r^ 5SBPiitrv J S ^ >Son-lieif^^j2^5lf ' - f e T T H r ^ - AA i^^^^r LSOfTOAjK' 3,BlC ^^?frY^ ^ ^ P ^ ^ ^ ^ T^.JiBa^^i^X'^ Vf/C^^,''-^- - / ; ^ r ^ ^ C B S ^ "Ci 1^^30 Ar~v2^^^^'"^S-^ s 20 lis kilometers 867672 88^70 909220 JS 1608195 (14''30'45-) 608195 (1d'3D'45'l Hinh Ban aS khS nSng chong chiu tai bi6n tnrol \d dit c^c huyf n miSn nOi flnh Qu3ng Ngai Bdng Ma trSn ddnh gid n g u y co* thi#t hai tai bien tru-gl I g d^t s a y vKh^ nSng chong Ban nguy co thi?t heii cac huy^n midn niii tinh Qudng Ngai {hinh 3) dugc tich hgp tii ban dd nguy CO TLD {hinh 2) vdi ban khd ndng chdng chju tai bidn cua cac ddi tugng KT-XH {hinh 1) thdng qua cdng cy GIS theo ma tr$n ThSp Tnjng binh Bdn nguy c a thi^t hai T L D cdc h u y ^ mien ndi tinh Qudng Ngai thd hi$n d cdp khde {hinh ChO thich CSp nguy co thi§t hgi RT - Rit thlp, T - Th^p; Trung binh - TB; L - Ldn, RL - Rdt l*n 3): nguy co thidt hai rdt thdp, thap * ™ " ^ ' " * * ' ^^ ^^ ^^ '°"- .^ CHO GIAI Cap nguy co IrucJI Id Rat ihap HANH ^^^P Tfurg bmh kilometers 867672 1608195(14°30'45''l 1608195 (U'30'45") Hinh Ban nguy co torgt Id dat cac huyen mien niii t'nh Quang Ngai [4] «iSS880M5'21'8' b ^ H ^ 8 ^ 867672 O U A N G NAM ^'d&rr7 ^ ^ ^ ^ ^ ' , 847280 g 909220 BiNH SON Vr/aThanli.T«'.^i^3^ aa^^Ss^s^j^^ N W-«»-E i CHU GIAI ^ i *yMflSMS||^gjqigiil 1677113 r~\r;^^^ MiS^'TBjy^T^/ * ) \ j^Wli^WE^^.T" S XS,NGHIAHANH ^ y r t j H K ^ ^ S o n , l > h j - i ; d Long S o n ^ ^ V i p ra^HBftWTS ie5472eN^^rr^::^ |MINH,L0NG^1S^^ 1654728 ^ ] f ' ~ Sun LSp ' ^C^^^^'""^^^!^^^ KON TUM ^ ^ ^ ^''d-'^'^t^'i^^\(i-^^^^^MY' s^^ DUCPHS ^^g?:^^^ 1631730 Slju \^ /•'''J''^J-?T!A-^2Y\ ^ c 10 BINH S 20 61A kilometers , LAI T J ^ IS S 86767.' 1608195 (14°3D'45") 1608195 (14'30'45*) Hinh Ban nguy ca thiet hai TLD cac huy#n m i l n nOi tinh Qudng Ngai 3.2 Bdnh gid nguy ca thiet hai TLD gdy ^2.1 Huyen Tay Trd Huydn Tay Tra ndm d phia tay bdc khu virc nghien cuu, cd didn tich rdng 33776 vdi dan sd 17825 ngudi phdn bd tap trung d cdc xa Tra Phong, Tra Lanh, Tra Tho, Trd Thanh, rai rac d cac xa Tra KJie, Trd Quan, Tra Xinh, Trd Trung vd dgc theo cac tinh Ig: TL622B, TL626 Kdt qud khoanh viing nguy CO thidt hai TLD gay cho thay, phdn ldn dien tich huydn Tay Tra cd nguy c a thidt hai d c ^ trung binh va thap (khoang 58,47%) Cdp nguy C(T thidt hai cao vd rat cao chiem 24,34% dien tich ciia huyen Do vay, huyen Tdy Tra cd nguy co thi|t h?i TLD d mirc dg trung binh - thdp Thdng ke nguy CO thiet hai theo tirng xa cho thdy, cdc xd Trd Phong, Tra Ldnh vd Trd Quan cd nguy c o thi?t h^i d miic cao huydn (bdng 4) Bang Th6ng kfi nguy co" t h i f t hgi theo dien f c h huyen Tay Tra (ha) cdp nguy ctr Dii$t h^' Ban vi hdnh chlnh (xd) TrdKh* 73,00 504,00 1532,00 970.00 116,00 Tr^Lfinh 144,00 1691,00 896.00 93,00 0.00 Trd Nham 128,00 718,00 1005,00 362,00 0.00 Trt Phong 379.00 2173,00 1387.00 101,00 0.00 TA Qudn 292.00 1023,00 412,00 106,00 0.00 Trd Thanh 158,00 117.00 1143,00 2944,00 223,00 Trt Tho 107,00 110,00 519,00 1890.00 2539,00 Trt Trung 0,00 108.00 274,00 1682,00 57.00 TrdXinh 0,00 85.00 486,00 2062,00 5167,00 1284,00 6938.00 9025,00 10859,00 5670,00 26,72% 32,15% 16,79% Ting cl>ng (ha) Ph^n Irtm (%) Viing CO nguy co thidt h^i TLD rat cao rdng 1284 ha, chiem 3,8% didn tich cua huydn va phdn bd d cdc xa Tra Phong, Tra Quan vd Tra Lanh Viing cd nguy ca thidt h^i TLD cao rgng 6938 ha, chidm 20,54% didn tich ciia huyen; phdn bd thdnh nhOng ddi kdo ddi theo phuang a kinh tuyen va d vy tuydn thugc dja phan cdc xa Tra Thanh, Trd Qudn, Tra Khd, Tra Lanh, Trd Thp, Tra Phong vd Trd Nham, Viing cd nguy co thidt hai TLD trung binh rgng 9025 ha, chidm 26,72% dien tich ciia huy?n; phdn bd nhiing ddi keo dai Iheo phirong a kinh tuyen va a vy tuyen thudc dia ph^n cdc xa Trd Thanh, Tra Khe, Tra Qudn, Trd Ldnh, Trd Thg, Trd Phong, Viing cd nguy co thiet h?ii TLD thdp rgng 10859 ha, chidm 32,15% di?n tich cua huydn; phan bd thdnh nh&ng ddi keo ddi theo phuang d kinh tuydn vd TB-DN thudc dia ph|n cdc xa Tra Khe, Trd Thanh, Trd Thg, Tra Xinh va Tra Trung Vimg cd nguy ca thiet hai TLD rdt thdp rgng 5670 ha, chidm 16,79% didn tich ciia huyen; phan bd rai rac thudc dia phdn cac xa huyen, d dgc theo cdc ddng bang thung lung sdng va trung giQa nui cua huyen Tay Trd 3.2.2 Huyen Trd Bong Huyen Trd Bdng cd didn tich rdng 41926 vdi 29745 ngudi phdn bd tap trung d thi tran Trd Xudn, cac xa doc thung lung sdng Trd Bdng: Tra Giang, Trd Binh, Tra Phii, Trd Thuy, Trd Son va Tra Lam Kdt qua khoanh viing nguy co thiet hai TLD cho thay, phdn ldn dien tich huydn Trd Bdng cd nguy co thidt hat TLD d cdp thap va rat thdp (khodng 79,37%) Cap nguy co thiet hai truot Id cao va rat cao chiem phdn it hon, khodng 20,63% didn tich ciia huydn Nhu vdy, huyen Trd Bdng cd nguy co thidt hai TLD d muc trung binh-thap (bdng 5) Bdng Th6ng Ite nguy co- thiet hai theo dien tich huyen Tra Bong (ha) Cap nguyco thi#t hgi Don v| hdnh chinh [xS] Trd BInh TrtBul Trd Giang Trt Hi^p Trt Urn TrtPhiJ Trt Sen Trt Thiiy TrtTfln Trt Xuan Tdng cCng (ha) Phin trflm {%) 112,00 270,00 0,00 108,00 0,00 101,00 0,00 212,00 108,00 1943,00 179,00 595,00 983,00 1836,00 248,00 1416,00 0,00 0.00 271,00 269.00 1901,00 6750.00 4,53 16,10 1692,00 269.00 493,00 1775,00 1207,00 806,00 1746,00 2890,00 23,00 42,00 10943,00 26,10 1080,00 2445.00 338,00 52.00 1112,00 1975,00 2003,00 129,00 12263,00 29,25 0,00 1859.00 1947.00 342,00 29,00 806,00 5086,00 0,00 10069.00 24 02 Viing cd nguy co thiet h^i TLD rat cao rdng 1901 ha, chidra 4,53% dien tich ciia huydn va phdn bd d cac xa Trd San, Tra Thuy, Tra Lam vd thi trdn Trd Xuan, huyen Tra Bdng Viing cd nguy co thidt hai TLD cao rdng 6750 ha, chidm 16,10% didn tich cua huydn; phan bd thdnh nhiing dai keo dai theo phuang a vy tuyen thudc dia phan cdc xa Trd Hidp, Tra Lam, Trd Thiiy, Tra Son, Trd Phu va Trd Binh Vimg cd nguy ca thidt hai TLD trung binh rdng 10943ha, chidm 26,10% didn tich cua huydn; phan bd nhirng dai keo dai theo a vy tuydn thugc dia phan cdc xd Tra Binh, Tra Phii, Trd Hiep, Tra Lam va Tra Thuy Vimg cd nguy co thiet hai TLD thdp rdng 12263 ha, chidm 29,25% didn tich ciia huydn; phdn bd thdnh nhirng dai keo ddi theo phuang a vy tuyen thugc dia phan cac xd Trd Biii, Trd Giang, Trd Hiep, Trd Tdn vd Trd Thuy Vung cd nguy ca thiet hai TLD rdt th|p rdng 10069 ha, chidm 24,02% didn tich ciia huydn; phdn bd rdi rdc thugc dia phdn cac xa Trd Biii, Tra Giang, Tra Thiiy, Tra Tan vd Tra Hiep 3.2.3 HuySn San Tdy Huyen Son Tdy cd dien tich rong 38222 vdi 18119 ngudi phdn bd tap trung d xa Son Mua, Son Tdn vd Son Dung, cac xa doc thung liing song Mdu: San Mau, Son Tinh Kdt qua khoanh vung nguy CO thidt hai trugt Id dat cho thay, phan Ion dien tich huydn Son Tdy cd nguy co thiet h^ TLD d cap trung binh, thap vd rat thap (khoaiig 93,61%) Cap nguy co thiet hai tnrgt Id cao Va rdt cao chiem phan rdt it, 1,00% didn tich cua huyen Nhu vay, huyen Son Tay cd nguy ca thiet hai TLD d miic dp thap - rat thdp {bang 6) Bang Thong Ite nguy c c thiel hgi theo d i f n tich huyfen S e n Tdy (ha) d p nguy ca thi^t h@i Den VI hanh chinh (xa) Scvn Bua 0,00 0,00 0,00 54,00 Sen Dung 0,00 9,00 816,00 3878,00 657,00 Son Lien 0,00 0,00 0,00 996,00 2481.00 4302,00 Son Long 0,00 f),DO 4,00 2309,00 1015,00 Son Lap 0,00 0.00 6,00 308,00 5101.00 Son Mau 0,00 0.00 4,00 2678,00 1497,00 Son Mua 0,00 15,00 156,00 1988,00 1892,00 Son T^n 90,00 189,00 631,00 1966,00 293,00 Son Tmh 0,00 0,00 125,00 2549,00 1685,00 T6ngopng (ha) 90,00 313,00 2042,00 16854,00 18923,00 Phan tram (%} 0,20 0,80 5.34 44,10 49,51 Vung cd nguy co thiet hai TLD rdt cao va cao rdng 403 ha, chiem 1,00% didn tich cua huydn va phan bd d xa Son Tan Viing cd nguy co thiet h^i TLD trung binh rpng 2042 ha, chidm 5,34% dien tich ciia huydn, phan bd nhiirng ddi keo dai theo a kinh tuydn thudc dia phan cdc xa Scm Tan, Son Dung, San Mua va San Tinh Viing cd nguy CO thiet hai TLD thdp va rdt thdp rpng 35777 ha, chidm 93,61% didn tich cua huyen; phan bd nhirng dai keo dai theo phuong a kinh tuydn thudc dia phan cac xa Son Dung, San Long, Son Mdu, Son Miia, Son Tan va Son Tinh Ngoai viing nguy ca thidt hai thdp vd rdt thdp cdn phdn bd rdng khdp d cac xa Son Bua, San Lien va Son Lap 116 3.2.4 Huyen San Hd Huyen San Hd cd dien tich rpng 75192 vdi 68448 ngudi phan bd tap trung d thi trdn Di Ldng, cdc xa Son Ha, Son Thanh vd Son Giang vd cac xa dpc thung lung sdng Re: Son Trung, Son Hdi, Son Thuy, Son Ky va Son Ba Kdt qua khoanh viing nguy CO thiet hai TLD cho thdy, phdn ldn di?n tich huyen Son Ha cd nguy ca thidt hai tnrgt 16 ddt d cdp tir cao ddn trung binh va thdp (khoang 79,21 %) Haj cdp nguy ca thiet hai trugt Id r^t cao vd rdt thdp d huydn Son Ha chi chidm phdn rat it, 20,80% didn tich ciia huydn Nhu vay, kdt qua khoanh viing nguy co thidt hai TLD gdy nen d huydn Son Hd cho thdy, huydn San Ha cd nguy CO thiet hai truot Id ddt d miic dd cao - trung binh {bang 7) Bdng? Thing kd nguyctr thift hai theo di|n tich huyin S