Analysis of bed material of Tanaro River (north -western Italy)

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AHI'POIIO|IHI{OE

... 1ó8 ANN\_ALYSISOFBEDtr,IATDRIAL OFTANARO RIVER (NORTII.WNSTER}i

_ITALY)

ICNAZIO BECCIn, LUC^ SOL^RI,

]!IICIIELE

CATELLA, BDATRICD

MIINGONI &

LORENZA ROSSI

ROMr\N[I,LI

Depllrtmenrof Civil EnSineering, UrìveÉ

siry ofFìlen7-e. via

S

Malra

l.

50 r 39 l{aly

C-nail: becchi@dicea.unifi .it

Abslfad Sùd..e

bcd dde.ìal

sar.pling his bccn caried oùt in aÌmost thc

ertne lengtlì ot the Tanaro Rivcr ftom thc

confluenc.

wjih

lhc

Po River (no

h

Nesteú

llaly). Crain

size

distribuLions shos a high dc8ree ofbimodality, ynh onc nodc io thc sand rangc and onc modc in thc Sravcl range

Thc

Lwo úodes arc eleà,1y

scpúatcd duc to rhe aìmosr complctcly lack

ol

sedìrncnls

jn

rhe

gmnular nnge

2<p<l

5.

SrrÌistical

ìnfcrcice

of

sarnplc data sùgg€srs lhdt úe

grdii

mixrúos can bc

considrred as thc sum

oftwo

nonnaìdistri butions having

diflì.cnt

mcan but thc sanc

vùriùice.

Gravcl and

sand distdbutions dìspl.y dillèreDt spàLiàl vrrìabilities: in Ihc fornrer

downr.erm

finjng

occur,

in

lhc latlcr noî net lcndcncics arc appalcnL. The

proposed approach provides abeuer insiSht

oi

rhe spatiaì distribLuion

of

thc sedìmert

&:_.rqj]!

Tanaro River; sedi' ment sarryljnSi bimodalityi statisrical Ìn-lerprelationi Tan & Chang model.

I^"TRODUC'IION

The

rùdy

of

morphoìogy and

nain

mechanjsns occuring

in

a river

re-quire the knowìedge of

hoe

allùvial

sedi-mcms are lransfered lhrough

lhe

fluvial

system.

'ro

this

aid

parrìcle sizc disrribù

tions ofthe rivcrbed are needed.

The pcscnr amlysìs is

pxr

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LOAD SURVEY ON'TANARO RIVER

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