Analysis Of Geomorphological Features Of Mount Longhu Based On DEM

Danxia landform originated in China, and its research could be dated back to70yearsago. The current study on Danxia landforms is mainly focused on definition, classificationand some other qualitative descriptions about the landscape, while quantitative analyses arevery limited. Danxia landform had been known by all over the world for it was listed as aUNESCO World Natural Heritage in2010, and then stricter requirements were put forwardfor its research. Based on endogenic and exogenic geological processes, this paper made anattempt to use geomorphic parameters to analyze the environment of Danxia landformsdevelopment. Adopting the quantitative research methods will do favor to the internationalcomparative study on Danxia landform and promote the internationalization of its research.There are numerous Danxia landforms in southeast China. As its typical Danxialandform landscapes, Mt. Longhu in Jiangxi Province has become a hot spot forresearching Danxia landforms. In this paper, the geomorphic parameters of Mt. Longhuwere extracted base on DEM data and GIS technology, and analyzed combined withregional geological data. The principal conclusions of this analysis are listed as follows:(1)Faults in this area have an obvious control effect on terrain slope, aspect and reliefamplitude, and both sides of the faults often have different topographic factors.(2)The longitudinal profiles of the7rivers are most fitting with the functions in theexponential and the logarithmic forms. This indicates that the rivers of study area are stillin the stage of maturity. This may be caused by the regional tectonic activities, leading theriver developed slowly. Due to little effected on tectonic activities, R1and R4river aremore mature(logarithmic forms), and the results of drainage density analysis also confirmthis point.(3)The shape of Hack profile reflects the history of tectonic movement in this regionand the differences in uplift rates. And local concave and convex shape of hack profile maybe affected by recent faults activities.(4)The normalized stream length-gradient index (SLK) in the research area wasaffected by lithology, tectonics and tributary inflow, but the high SLK is an indicator of thefaults activity. (5)In the analysis of Hypsometric integral, low HI values (HI<0.4) show that thewhole landscape are eroded seriously, and the sub-watersheds with high HI values aremainly concentrated in the southeast of the study area and near some faults.These geomorphic feature parameters indicate that the effect of Wuyishan uplift hasmade the regional strata in the state of uplift since the Quaternary, and the different upliftrates lead to the distribution of faults. In addition, the terrain elevation difference formedby crustal uplift, combined with humid and rainy climate, create strong erosion in thisregion. All of these provide a good condition for the development of Danxia landforms inMt. Longhu.