A
B
338
Fluvial Depositional Systems and Autogenic Sedimentary Controls
�
�
�
..
� """" "2:2i
' '"
111/om�tr�s
LEGEND
0 Ftoodpklln deposits (mudstoMsl
1;,:: ' :>- · 1 Channel sandstones
E
Major erosion surfoee
26 Number of avulsion
LEGEND
0 Ftoodploln depollh (mudatonae) k::· :.:::;, r�:J Chonn•� aondetonea � Pedogonlc corbonote unlta
E Major eroalon surface
� � 7 MuHI•!Storey eond body
Fig. 10.32A,B. Two of Allen's (l974b) qualitative models
of alluvial stratigraphy.A Model 3, developed by autogenic
avulsion of the channel belt. B Model SB, developed by a
built on an analysis of the mechanics of channel-belt
and floodplain construction and a systematic docu�
mentation of the rates and scales of various
autogenic sedimentary processes. The main purpose
of the model is to build cross sections of alluvial
stratigraphy in an orientation perpendicular to
combination of autogenic channel avulsion and a cycle of
dissection and aggradation, in which the base level
changes over a vertical interval greater than channel depth
paleoslope. The model is quantitative, in that magnitudes, rates, and scales are stated, and many of
the parameters are designed as variable input for
successive computer runs to permit an exploration
of the complex interaction between dependent and
independent variables. Channel-belt sand bodies are
B
338
Fluvial Depositional Systems and Autogenic Sedimentary Controls
�
�
�
..
� """" "2:2i
' '"
111/om�tr�s
LEGEND
0 Ftoodpklln deposits (mudstoMsl
1;,:: ' :>- · 1 Channel sandstones
E
Major erosion surfoee
26 Number of avulsion
LEGEND
0 Ftoodploln depollh (mudatonae) k::· :.:::;, r�:J Chonn•� aondetonea � Pedogonlc corbonote unlta
E Major eroalon surface
� � 7 MuHI•!Storey eond body
Fig. 10.32A,B. Two of Allen's (l974b) qualitative models
of alluvial stratigraphy.A Model 3, developed by autogenic
avulsion of the channel belt. B Model SB, developed by a
built on an analysis of the mechanics of channel-belt
and floodplain construction and a systematic docu�
mentation of the rates and scales of various
autogenic sedimentary processes. The main purpose
of the model is to build cross sections of alluvial
stratigraphy in an orientation perpendicular to
combination of autogenic channel avulsion and a cycle of
dissection and aggradation, in which the base level
changes over a vertical interval greater than channel depth
paleoslope. The model is quantitative, in that magnitudes, rates, and scales are stated, and many of
the parameters are designed as variable input for
successive computer runs to permit an exploration
of the complex interaction between dependent and
independent variables. Channel-belt sand bodies are