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|Other Titles: ||Fractal analysis of miscanthus floridulus root system|
|Authors: ||黃瀚瑱;Huang, Han-chen|
|Keywords: ||芒草植生;邊坡穩定;凝聚力增量;安全係數;方格維度;Vegetation with Miscanthus Floridulus;Slope stability;Cohesion increasement;Safety factor;Box dimension|
|Issue Date: ||2010-01-11 05:26:54 (UTC+8)|
In the light of Miscanthus Floridulus, this study undertakes sampling in the field and portrait analysis as auxiliary and obtains basic data of appearance of Miscanthus Floridulus; such as: shoot height, stem diameter, root length and so on. Also, making use of fractal concept to calculate complexity (Db) of root distribution; as well as using box dimension to find out different depth cross section of box dimension Db(A). At the another aspect, laboratory direct shear test of root-connected soil has been undertaken to seek for relations of Miscanthus Floridulus complexity and soil strength increase of root. Also, enhancement of cohesion (Δc) has been considered to confer slope side soil parameter of vegetation improvement; and to harmony with Stabl to analyze changes of slope side safety factor. Conclusions are listed below:
(1) The geometry distribution of Miscanthus Floridulus
actually has fractal character. Although laboratory analysis after being disturbed, total capacity of root and its fractal parameter are not influenced. And, Db of root projection of any location is almost same and complexity still closes to root fractal situation in the field.
(2) Although different growth direction of upper slope surface or slope face, shoot height (H) and root distribution complexity have positive correlation. Different root area but its root fractal character is same. The root distribution of shoot height 10cm-134.5cm, its Db value is between 1.0-1.55.
(3) The longer of the shoot height(H), the larger scope of the root bottom and its distribution is more complicated. Therefore, shoot height and capacity of root have positive correlation. When the largest of cross section Db(A) of underground 0-5cm shoot, it is meant that root in this area is the most complicated and the largest function of root-connected are provided.
(4) The main function of root-connected is to promote soil cohesion (Δc), no bigger change to friction angle. To comply with the higher of shoot height, the more of cohesion increasement (Δc) will be. It will go along with root growth and enlarge improvement. Therefore, making use of complicated knot of vegetation slope protection and enlargement of root growth, no doubt, the effect of slope side will be stabilized.
(5) When vegetation at the slope side of cohesionless soil (c=0), its effect is better than that of cohesive soil (c≠0). To follow growth of shoot height of Mmiscanthus Floridulus to increase shear strength, the safety factor of slope side will be comparatively risen.
|Appears in Collections:||[Graduate Institute & Department of Civil Engineering] Thesis|
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