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[1]LYU Fayou,TANG Qiang,ZHANG Shujuan,et al.Response of Purple Soil Physical Properties to Repeated Water Flooding in Water-Level Fluctuation Zone in the Three Gorges Reservoir[J].Research of Soil and Water Conservation,2018,25(01):276-281.

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Response of Purple Soil Physical Properties to Repeated Water Flooding in Water-Level Fluctuation Zone in the Three Gorges Reservoir

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 01 Page number: 276-281 Column: Public date: 2018-02-28

Title:: Response of Purple Soil Physical Properties to Repeated Water Flooding in Water-Level Fluctuation Zone in the Three Gorges Reservoir

Author(s):: LYU Fayou^1,2, TANG Qiang¹, ZHANG Shujuan^1,2, HE Xiubin¹, BAO Yuhai¹; 1. Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China

Keywords:: Three Gorges Reservoir; water-level fluctuation zone; physical properties; repeated flooding

CLC:: S151.9⁺2

DOI:: -

Abstract:: The purple soil of Three Gorges Reservoir region water-level fluctuation zone was selected to explore the response of soil physical properties to repeated flooding. The distribution pattern of soil physical properties and their response to water flooding were analyzed and compared with the non-flooded soil at 180 m. Soil samples were collected in two layers of 10 cm each for analysis. The results showed that the strongest influence on the topsoil was observed due to flooding. The soil bulk density decreased with an increase in elevation of water level, and the maximum decrease in the soil bulk density was 16.42%. After impounding, the soil bulk density increased significantly, and the maximum increase in soil bulk density was 38.42%. The soil porosity reached to the lowest point (40.77%) at 160 m. Flooding significantly reduced the porosity, and it reached its lowest point of 35.10%. The grain composition became coarser with the decrease of the water elevation level and soil layer. With the increase of elevation of the water level, percentage volume of coarse particles gradually decreased for the two layers, and decreased by 40.47% and 52.99%, respectively. Flooding had positive effects on the percent volume of sand and median diameter, and the maximum value of sand increased by 91.60% and 141.72% for the two layers, respectively. The cohesion presented the unimodal curve along the water-level fluctuation during the same period, the maximum amplitude of variation was 195.76%. Flooding resulted in the increase of soil cohesion, the maximum variation was 163.24%. There was no significant distinction in internal friction angle with elevation changes. Flooding altered the internal friction angle, and its maximum value reached to 54.42%. The results of the present study can be used as the references for analyzing the mechanism of soil erosion and controlling the soil erosion.

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