干热河谷冲沟侵蚀劣地坡积区土体性质与裂缝形态发育特征
发布时间：2018-08-25 18:24
【摘要】：采用实地调查和室内分析等方法,并结合数字图像处理技术,研究了干热河谷冲沟侵蚀劣地坡脚堆积区(PJ)、坡底沉积区(PD)和平地漫流区(PM)土体性质和裂缝形态发育特征,并探讨了土体性质对裂缝形态特征的影响。结果表明,(1)侵蚀劣地坡积区不同部位土体性质差异显著,其中土壤体积质量及黏粒质量分数均表现为PDPJPM,毛管孔隙度为PMPDPJ,有机质为PMPJPD;不同部位土体性质极值比:黏粒质量分数最大(1.94),有机质(0.65)次之,再次是毛管孔隙度(0.27),土壤体积质量(0.09)最小;PJ、PD土体性质变化主要受物源特性和沉积方式的影响,而PM土体性质主要与植被分布以及漫流有关。(2)干热河谷侵蚀劣地不同部位土体裂缝形态特征差异也十分显著,其中裂缝长度密度(Lc)及连通性指数(K)均表现为PDPJ≤PM,面积率(Rc)、面积周长比(APc)及加权平均分形维数(AWMFRAC)则整体上表现为PD≥PJPM(Ⅲ号坡积区的Rc除外);表明裂缝发育强度(Rc)及复杂程度(APc、AWMFRAC)PD最高,其次为PJ,再次是PM。(3)相关分析表明,长度密度与土壤体积质量(p=-0.782)、黏粒质量分数(p=-0.626)均呈显著负相关,连通性指数与黏粒质量分数呈显著负相关(p=-0.618),这表明土壤体积质量及黏粒质量分数对裂缝发育产生了重要影响。
[Abstract]:By means of field investigation and indoor analysis, combined with digital image processing technology, the properties of soil mass and the development of cracks in (PD) soil mass and fracture morphology in (PJ), slope bottom deposit area of (PJ), slope bottom deposit area of dry and hot valley gully erosion and inferior slope foot accumulation area were studied. The influence of soil properties on fracture morphology is also discussed. The results are as follows: (1) the soil properties in different parts of the eroded slope area are significantly different. The soil volume mass and clay mass fraction showed that PDPJPM, capillary porosity was PMPDPJ, organic matter was the extreme value ratio of soil properties in different parts of PMPJPD;: clay mass fraction was the largest (1. 94), organic matter (0. 65) was the second. Thirdly, the capillary porosity (0.27), soil volume mass (0.09) and the soil properties of PJ / PD are mainly affected by the characteristics of provenance and the way of deposition. The soil properties of PM are mainly related to vegetation distribution and overflows. (2) the differences of soil crack morphology in different parts of dry and hot valley erosion are also significant. The fracture length density (Lc) and connectivity index (K) are PDPJ 鈮，
本文编号：2203726
[Abstract]:By means of field investigation and indoor analysis, combined with digital image processing technology, the properties of soil mass and the development of cracks in (PD) soil mass and fracture morphology in (PJ), slope bottom deposit area of (PJ), slope bottom deposit area of dry and hot valley gully erosion and inferior slope foot accumulation area were studied. The influence of soil properties on fracture morphology is also discussed. The results are as follows: (1) the soil properties in different parts of the eroded slope area are significantly different. The soil volume mass and clay mass fraction showed that PDPJPM, capillary porosity was PMPDPJ, organic matter was the extreme value ratio of soil properties in different parts of PMPJPD;: clay mass fraction was the largest (1. 94), organic matter (0. 65) was the second. Thirdly, the capillary porosity (0.27), soil volume mass (0.09) and the soil properties of PJ / PD are mainly affected by the characteristics of provenance and the way of deposition. The soil properties of PM are mainly related to vegetation distribution and overflows. (2) the differences of soil crack morphology in different parts of dry and hot valley erosion are also significant. The fracture length density (Lc) and connectivity index (K) are PDPJ 鈮，
本文编号：2203726
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