-
Roundness : 0～6 rho(ρ) scale (Folk, 1955), 0～1 (Wadell : 1933)
-
Sphericity : oblate(disk), equant, bladed, prolate(roller)
Ψ
= s/S (Wadell : 1933) (s: 같은 부피의 sphere로 환산한 표면적, S: 실제
표면적)
CSF
= S/(LI)½ (Corey : 1949)
(S: short diameter, L: lond diameter, I: intermediate
diameter)
① Concoidal fracture - outwash fan
② Smooth rounded - v_shaped percussion - beach
③ Frosted, pock-marked & concoidal fracture - desert
-
Fabric
: packing
┌
cubic - least stable
├
rhombic - most stable
├
point - contact
└
concave - convex contact, sutured contact, preferred orientation, (imbrication)
grain-supported
& matrix- supported
-
Porosity
& permeability (moisture
content)
-
cubic : 47.6%. - rhombic : 26%
immature ＞5%
clay, poor sorting, angular grains.
submature -
little or no clay, poor-sorting, angular grains.
mature -
good sorting, angular grain.
supermature -
good sorting, well-rounded.
→
two environments or sources에서 유래된 퇴적물의 mixing(예: 하천의 본류와
지류의 합류지점, 조간대에서 storm wave 또는 bioturbation에 의한
상하 퇴적층의 교란)
→
퇴적암 기원의 recycled퇴적물의 경우.
**
Selective transport : 퇴적물의 초기 이동에 영향을 주는 요소
① pivot angle
② 기타 : size, shape, density(hydraulic equivalence)
fluid viscosity, turbulence intensity concentration of particles
기타변수 : particle flocculation - clay mineral : - charged
transport
: 두 요소의 상호작용 ┌ fluid drag velocity
└ bed stress
