A study of rationality of slopeland use in view of land preservation |
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| Authors: | Li-Ling Lin Chao-Wen Wang Cheng-Lung Chiu Yung-Chuan Ko |
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| Institution: | (1) Department of Soil and Water Conservation, National Chung-Hsin University, No.250, Kuo-Kuang Rd, Taichung, Taiwan;(2) Central Geological Survey, Ministry of Economic Affairs, No.2, Lane 109, Huashin Street, Chungho, Taipei County, Taiwan;(3) Soil and Water Conservation Bureau, No.6, Guang-Hua Rd. Chung-Hsing New Village, Nantou, Taiwan;(4) National Chung-Hsin University, No.5, Alley 30, Lane 3, Fengle Rd., Beitun Dist, Taichung, 40673, Taiwan, ROC; |
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| Abstract: | In recent years, frequent attacks of heavy rain and typhoon have severely devastated the vulnerable mountains of Taiwan; slopelands
are artificially disturbed by improper development and utilization. People are getting more aware of the importance of slopeland
preservation as well as disaster prevention and mitigation. The government, realizing the criticality of gradually worsened
land safety issues, has also set forth the “Draft of National Land Planning Act” and the “Draft of Regulations on Land Preservation
Act” in the purposes of rehabilitating the excessively explored ecosystems and diminishing the development extent of environmentally
susceptible areas, so as to effectively preserve soil, water, and organism resources and to achieve perpetual development
of national lands. “Classification of Slopeland Utilization Limitations” is a critical link to national land preservation.
The classification is based on four factors, namely average slope, effective soil depth, soil erosion, and parent rock, with
different utilization zones defined as bases of landuse planning. However, current classification results of the environmentally
susceptible and disaster-prone mountain lands are mostly defined as suitable for forestry or husbandry. Scattered allocation
of these lands results in critical issues such as segmented landuse and impaired landscape and ecotype. It is necessary to
re-adjust land resources planning and usage management. Therefore a review of the current standards for classifying slopeland
utilization limitations is proposed to facilitate rational allocation of slopeland use. Jhuoshuei River is selected as the
scope of the case study, with data of debris flows induced by the typhoon Toraji in 2001 as the training data. Eight susceptibility
factors, which include form factor of watershed, integral hypsometric, slope of main stream, density of stream network, density
of road network, area ratio of historical landslide, and area ratio of triggered landslide, together with the total rainfall
of the storm event as the triggering factor, are selected for creating the debris flow susceptibility model by employing the
logistic regression within the multivariate geostatistics analysis. This model interprets the curve of success ratio of debris
flows triggered by typhoon Toraji, of which the area under the curve is as high as 74.3%. The debris flow susceptibility model
created in the study takes the Feng-Chiu section of Sinyi Township, Nantou County, Taiwan within the Jhuoshuei River as the
scope of research. GIS technology has been applied in the feasibility study of classification standards. New concepts have
been further proposed in view of national land preservation addressing the medium and high elevation disaster-prone areas
that are not suitable for agricultural use, for standard revision reference. |
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