On the relationship between semantic waves of ideational grammatical metaphor and knowledge construction in disciplinary discourse
Grammatical metaphor,with a focus on ideational grammatical metaphors(IGMs),is an important linguistic resource for knowledge construction.However,few studies have explored the knowledge-constructing process of IGMs.The theory of semantic wave,which shares similarities with IGMs,focuses on the processes and approaches of knowledge accumulation.This study built a small corpus of physics disciplinary discourse and applied qualitative and quantitative methods to explore the types of semantic waves of IGMs and their contribution to the knowledge-constructing process in this domain.We found that 1)semantic waves of IGMs can be divided into semantic concave waves and semantic flatlines;2)semantic concave waves are mainly used to construct hierarchical knowledge structures and semantic flatlines are mainly used to construct horizontal knowledge structures;3)semantic concave waves play a more significant role in the construction of disciplinary discourse knowledge,with semantic concave waves Ⅰ,Ⅱ,and Ⅲ being the most prominent;and 4)the peaks of semantic concave waves are primarily formed by nominalisations of processes with qualifiers.
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