Sự phân tỏa vật liệu phù sa Sông Hồng ở Vịnh Bắc Bộ

6_2000<br /> <br /> ST/<br /> <br /> PHAI 16A VAT LIEUIHU SA SOXC rrdXC<br /> o vrNH nAc e0<br /> <br /> tr,tO OAU<br /> <br /> . D4c.didm ntji bat ciia sOng Hdng li hing nam<br /> c6 khoiing lZ}.t}n m3 nu6c d6<br /> t6l tt"o<br /> dong mor Iuong vat li€u phi sa "t"uydn<br /> (VLpS) rtt l6n,<br /> khoring I 14 rriOu tdn (dfing hdng thf<br /> & rren the<br /> <br /> gidi) ; nim nhidu nhAt 200 rri0u ran,<br /> nam ir<br /> <br /> nhAt<br /> <br /> khoring 55 tri€u tdn ; khOng ddu theo<br /> rnr.:u, uao rni,u<br /> lD (tu thang 5 ddn th6ng 9) lugnC phr)<br /> sa chiem r6i<br /> 9!.,%,cd^n mria can (7 thiLng.On tai) _<br /> lugng phi<br /> <br /> chi khoiing t0<br /> <br /> sa<br /> <br /> Trong que ffinh di chufcn, mot<br /> phdn.phn sa fthoiing 2O Vo) ll rich<br /> tu, t6ng Oong<br /> Il<br /> doc theo song, phAn con lai ldng dong<br /> iai kfiu vuc<br /> c6c cLia song vd phan t6a vao vinh SriJnO.<br /> 1. Phuong<br /> <br /> Vo.<br /> <br /> phip vi nguiltn tii ti€u<br /> <br /> Var Iieu trdm rich n6i chung ld srin phdm<br /> ftich<br /> thudc tu Vdi phdn rram dOh vdi mitimet)<br /> chri y€u<br /> cu#qr*trinh phong hof c(rc d6gO.<br /> f."g.", Uig"<br /> chAt, trdm tich) duo. c van chuydn<br /> theo dlng chaiy,<br /> gi6... ; sau d6 rich ru - sa l6ng tuy thuoc<br /> di6tu tien<br /> tu nhiOn noi ch0ng c6 mdt. Vat iieu trdm<br /> tictr do<br /> s6ng chuydn trii goi li VLpS sOng, g6m<br /> vAr Iitu uun<br /> rieu ro ning (WLL) uJuat rigu rrfa<br /> tin<br /> (VLHT)."l!<br /> Ngudn VLpS sau khi ra kh6i .,iu ,onf<br /> Ooo"<br /> phan tod - thuc chdt tham gia<br /> <br /> !*yL<br /> <br /> mOr h€<br /> <br /> qui<br /> <br /> trinh<br /> <br /> lhl" 9i."{ chait phu rhuoc ch€ ao'ttruy, itln.t, ua<br /> tinh chat ctia<br /> mOi tnrdng : phAn di co hoc (chu yeu<br /> <br /> VLV), phen di ho6 hoc (VLHT) vd phAn'di<br /> sinh<br /> hoc ; tao nOn c6c drdm, dicn trdm tich<br /> i.i,a. Juu.<br /> Nghien criu qu6 rrinh phan tod VLpS<br /> cria sons.<br /> thuc tg lA x6c lAp, ldm s6ng to muc<br /> d0. co .h; ,:i<br /> <br /> .<br /> <br /> pham<br /> <br /> vi<br /> <br /> ptran toti crja VLpS. Ooi r.bi phAn<br /> rc:.<br /> n co rhe thiet lap<br /> <br /> idm rdm tich<br /> <br /> b€<br /> <br /> ieh ta1 r.rnh Bic<br /> <br /> cia song. c6c ket quii ndy u"n. ul?"r?i<br /> <br /> Hlff<br /> <br /> t i :hi'do<br /> ..<br /> d€u. voi<br /> <br /> rhn rridu, thuOc kidu nhAt tridu gdn<br /> bi€n d0 dao dong tiung binh j,S ;O*<br /> n.h1 ay toi 3,5 - 4,0 m) vd thay aeji<br /> tt,"o xu ttre) : 6<br /> phia bic_ cao vd girim ddn vd phia<br /> nam ; t6c dQng<br /> manh d€h dong chdy ciia s6ng vd<br /> muc nu6c cua<br /> 127<br /> <br />