Leading the research innovation of Danxia landform and tourism geography by synthetic thinking: The geographical thoughts and academic contribution of Peng Hua
WENG Shixiu1(),YAN Luobin2,WANG Hua3()
1. School of Geography and Planning, Sun Yat-sen University, Guangzhou 510275, China 2. School of Geography, Southwest University, Chongqing 400715, China 3. School of Management, Jinan University, Guangzhou 510632, China
Peng Hua was a professor at Sun Yat-sen University who was long devoted to Danxia Landform research and geographic tourism. In retrospect, Peng's achievements can be introduced from three aspects. First, through seeking overseas collaboration and applying for nomination of world natural heritage sites, he made a great practical contribution in promoting Danxia Landform as an internationally known heritage. Second, concerning his academic contribution, Peng produced a wealth of nuanced insights in multiple aspects of Danxia Landform, including, but by no means confined to, its typology and evolution and the distribution of red beds. Equally, he systematically compared Danxia landform with many others, both in and outside China. Additionally, in recent years, he made benchmark progress by successfully extending the scope of research on red beds, including its underground and above ground surfaces, such as geological structure, rock properties, geomorphological evolution, natural hazards, soil erosion, land degradation, and its socioeconomic development. Also, Peng Hua initiated the national survey of Danxia Landform and constructed its data platform. Third, in addition to research on Danxia Landform, he devised multiple significant concepts in the fields of tourism planning, tourism culture, urban tourism and regional tourism development. Particularly, the concept of 'Broad Tourism', which was proposed by Peng Hua, has had a massive impact on the academic community of Chinese tourism studies. Based on this concept, he proposed a number of innovative theories and research methods, such as the system and mechanism of tourism, development stages of tourism destinations, integration of tourism exploitation and city construction, market classification analysis, and correspondence analysis of products and demands. To a considerable extent, there is no exaggeration in arguing that these theories provide a bird's-eye view of the tourism development, clarify the differences and inter-connections among the direct, involved, and supportive systems and mobilize the role of tourism in regional development. All in all, Peng's achievements reflect his openness, overall awareness, and optimal portfolio, which helps researchers keep a comprehensive view in dealing with more subtle research of geography.
. 以综合思维引领丹霞地貌与旅游地理研究创新——彭华先生的地理学思想与学术贡献[J]. 地理研究,
2018, 37(12): 2411-2419.
. Leading the research innovation of Danxia landform and tourism geography by synthetic thinking: The geographical thoughts and academic contribution of Peng Hua[J]. GEOGRAPHICAL RESEARCH,
2018, 37(12): 2411-2419.
Although red beds are a widespread landscape in China, geosciences academia fail to pay much attention to it, and a lack of collaboration among related fields results in a trend that different disciplines have different interpretations of the same issue; specifically, much concern on red beds, the fragile geographical unit, is highly needed with regard to land degradation and environmental problems. Humid area in southern China is one of the places where red beds are densely distributed. However, most of red beds areas are suffering from serious geomorphological catastrophes and soil-water erosion; even worse, many places are witnessing huge patches of 'red beds desert'. Even if we might admit that irrational land use contributes to the land degradation in red beds, there is no doubt that land degradation is a natural result of rock landscape evolution. This paper first indicates that natural evolution serves as a process of multi-factors' effect, which can be regarded as a system of mutual causality. Also, this paper analyzes the current researches on slope erosion mechanism of red beds landforms and areas, and raises scientific problems in red beds researches are facing with. Furthermore, this paper claims that a new interdisciplinary thinking of System Dynamics should be introduced to conduct a comprehensive research on the interrelation between red beds and landform development, natural catastrophes, soil erosion, environment degradation, overall geographic environment as well as production-living. Finally, this paper will hopefully find a way to promote land management and environment optimization.
[PengHua, YanLuobin, ChenZhi, et al.A preliminary study of desertification in red beds in the humid region of southern China. , 2015, 70(11): 1699-1707.]
YanLuobin, PengHua, HuZheng, et al.Stone pillar rockfall in Danxia landform area, Mt. Langshan, Hunan province, China. , 2016, 37(5): 327-343.http://www.tandfonline.com/doi/abs/10.1080/02723646.2016.1218244
A typical Danxia stone pillar, Leipishi I, in the World Natural Heritage site at Mt. Langshan, China, collapsed on 2 November 2009. To understand the mechanism controlling this rockfall event, uniaxial compressive strength, tensile strength, resistance against sulfuric acid, and freezing and thawing properties were analyzed from 44 sandstone and conglomerate cores collected from the Lanlong Formation, the only exposed formation on Mt. Langshan. In addition, four rock slices were created for analysis under a polarizing microscope. A detailed reconstruction of the geometry and restraint conditions of the stone pillar in place before the rockfall occurred permitted an estimation of the stress state before collapse using 3D finite-element code. The results show that the rapid retreat of soft, intercalated rock layers due to weathering can profoundly change the stress state within the rock body, causing compressive or tensile stresses to rise above compressive or tensile strengths in specific sections of a rock body, and causing partial or complete collapse.
[PengHua, WuZhicai.A priliminary study on the characteristics and the distribution of red beds. , 2003, 42(5): 109-113.]
PengHua.The concept, research history and existing problems of Danxia. , 2009: 172-182.http://www.dxdm.com/IAGdxwg/documents/files/03_Peng_Hua._The_Concept,_Research_History_and_Existing_Problems_of_Danxia.pdf
Abstract: Danxia is a kind of red beds landform characterized by scarp slope slope. This concept includes two basic elements: the red beds and scarp slopes. To the end of 2008, more than 790 Danxia landforms have been found in China. In recent decade years, researches on China Danxia landform present an unprecedented active development situation. However, Danxia basic research is still relatively weak. This paper puts forwarded a proposal that set a research base for a deep fundamental research based on regional studies. Thus systematically reveals the growth process and formation mechanism of Danxia landform. So impels the maturity of Danxia disciplines, and forms the window for international contrast research.
In the context that China Danxia landform went into the world and began the research of a new phase, it is necessary to make a review on the research progress of red beds and Danxia landform in and outside China. It is revealed that the domestic study was focused on the characteristics of red beds, engineering geology, features of Danxia landform and the basic problems of development. In general, in China there were no integrated studies of red beds concerning the field of geology and geomorphology, and the differences between lithologic characteristics of red beds and their related geomorphic development processes under the influence of exogenetic force were not well understood. However, research outside China were limited in the field of geology, and relevant studies of red beds and Danxia landform were conducted in the field of sandstone landform, with a microscopic, quantitative and experimental analysis. This paper suggests that most of the existing studies on red beds and Danxia landform were focused on single factor, and lack of subject system, and the integration of related subjects was also insufficient. Then, a new agenda for the future research was put forward, in which a clear discipline classification of red beds and Danxia landform and further basic research should be made, and the integration of related subjects, international communication and the global comparative research should also be strengthened.
PengHua, PanZhixin.Study on the weathering pattern and evolution process of Danxia bedding caves. Sandstone Landscape, Proceedings of the 3rd International Conference on Sandstone Landscape. , 2013: 140-145.
This study focuses on the mineralogical composition and texture of redbed soft rock. On the basis of the statistical analysis of the redbed soft rock characteristics, such as the composition, grain size observed under polarized light microscope, the effects of composition and texture on the mechanical properties were discussed respectively. The study on rock samples has shown that: ① the compressive strength and modulus of elasticity show a rising trend with the increase of mineralogy content and grain size; ② as average grain size increases, its compressive strength and modulus of elasticity become stronger accordingly. When the average grain size reaches a numerical range (diameter is about 025 mm), the compressive strength and modulus of elasticity would bump up at the same time, according to which we can speculate that mineralogical composition has a bigger effect on the mechanical properties than the grain size.
[ChenZhi, PengHua, GreifVladimir, et al.Analysis of mineralogical composition and texture to quantify the mechanical properties of red bed soft rock: A case study of Leipi Rock at world heritage site, Mt. Langshan in Hunan province. , 2015, 54(4): 139-149.]
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