干熱河谷沖溝侵蝕劣地坡積區(qū)土體性質(zhì)與裂縫形態(tài)發(fā)育特征
發(fā)布時(shí)間：2018-08-25 18:24
【摘要】：采用實(shí)地調(diào)查和室內(nèi)分析等方法,并結(jié)合數(shù)字圖像處理技術(shù),研究了干熱河谷沖溝侵蝕劣地坡腳堆積區(qū)(PJ)、坡底沉積區(qū)(PD)和平地漫流區(qū)(PM)土體性質(zhì)和裂縫形態(tài)發(fā)育特征,并探討了土體性質(zhì)對(duì)裂縫形態(tài)特征的影響。結(jié)果表明,(1)侵蝕劣地坡積區(qū)不同部位土體性質(zhì)差異顯著,其中土壤體積質(zhì)量及黏粒質(zhì)量分?jǐn)?shù)均表現(xiàn)為PDPJPM,毛管孔隙度為PMPDPJ,有機(jī)質(zhì)為PMPJPD;不同部位土體性質(zhì)極值比:黏粒質(zhì)量分?jǐn)?shù)最大(1.94),有機(jī)質(zhì)(0.65)次之,再次是毛管孔隙度(0.27),土壤體積質(zhì)量(0.09)最小;PJ、PD土體性質(zhì)變化主要受物源特性和沉積方式的影響,而PM土體性質(zhì)主要與植被分布以及漫流有關(guān)。(2)干熱河谷侵蝕劣地不同部位土體裂縫形態(tài)特征差異也十分顯著,其中裂縫長(zhǎng)度密度(Lc)及連通性指數(shù)(K)均表現(xiàn)為PDPJ≤PM,面積率(Rc)、面積周長(zhǎng)比(APc)及加權(quán)平均分形維數(shù)(AWMFRAC)則整體上表現(xiàn)為PD≥PJPM(Ⅲ號(hào)坡積區(qū)的Rc除外);表明裂縫發(fā)育強(qiáng)度(Rc)及復(fù)雜程度(APc、AWMFRAC)PD最高,其次為PJ,再次是PM。(3)相關(guān)分析表明,長(zhǎng)度密度與土壤體積質(zhì)量(p=-0.782)、黏粒質(zhì)量分?jǐn)?shù)(p=-0.626)均呈顯著負(fù)相關(guān),連通性指數(shù)與黏粒質(zhì)量分?jǐn)?shù)呈顯著負(fù)相關(guān)(p=-0.618),這表明土壤體積質(zhì)量及黏粒質(zhì)量分?jǐn)?shù)對(duì)裂縫發(fā)育產(chǎn)生了重要影響。
[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，
本文編號(hào)：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，
本文編號(hào)：2203726
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