development of landform? Comparison between L.C King and J.T Hack.
Answers
Explanation:
The most popular theory of landform development was given by American geomorphologist William Morris Davis. His concept of geographical cycle (or commonly known as cycle of erosion) provided a genetic classification and systematic description of landforms.
Theory of J. T hack
American geomorphologist J.T. Hack made a serious attempt to fill the conceptual vacuum created by the criticism and rejection of Davisian evolutionary model of geographical cycle and Penck’s morphological system. Hack pointed out that multi-level landscape (polycyclic relief) cannot be explained in terms of multiple erosion cycle (Davisian notion), rather these landscapes can be explained in terms of dynamic equilibrium theory.
According to Hack, geomorphic system is an open system and so long as energy remains constant in the geomorphic system, landscape remains in the steady state condition despite the lowering in the landscape by denudational processes. Hack’s model envisages time-independent development of landscape. In other words, “the shape of the landforms reflects the balance between the resistance of the underlying materials to erosion and the erosive energy of the active processes”.
The main assumptions of the Hackian model of landscape development are:
(a) There is balance between denudational processes and rock resistance.
(b) There is uniform rate of downwasting in all components of landscapes.
(c) Differences and characteristics of form are explicable in terms of spatial relations in which geologic patterns are primary consideration.
(d) The denudational processes which operate at present have been carved out of the earth’s surface landscapes.
(e) There is lithologic adjustment to landforms.
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