Experimental study on unsaturated soil water diffusivity in different soils in Hebei Piedmont Plain
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摘要
Horizontal soil column method was used to determine the horizontal diffusion rate of sandy loam, loam and clay loam under the same bulk density. The results showed that the migration rates of different lithological wet fronts were different. The sandy loam had the fastest migration rate, the loam followed, and the clay loam was the slowest, but the law of change is the same among the three lithologies. The volumetric water content affects the change of Boltzmann parameter λ. When the volumetric water content is between 0.35-0.45 cm~3/cm~3, λ approaches stability. When the volumetric water content is less than 0.35 cm~3/cm~3, the λ value decreases rapidly with the decrease of water content. The water diffusion rate is related to the volumetric water content and particle size. The greater the moisture content is, the greater the diffusion rate will be. The larger the particle size, the larger the diffusion rate. The diffusivity of sandy loam is 10-30 times larger than that of loam and clay loam. The relationship between water content and diffusion rate is in accordance with the exponential function.
Horizontal soil column method was used to determine the horizontal diffusion rate of sandy loam, loam and clay loam under the same bulk density. The results showed that the migration rates of different lithological wet fronts were different. The sandy loam had the fastest migration rate, the loam followed, and the clay loam was the slowest, but the law of change is the same among the three lithologies. The volumetric water content affects the change of Boltzmann parameter λ. When the volumetric water content is between 0.35-0.45 cm~3/cm~3, λ approaches stability. When the volumetric water content is less than 0.35 cm~3/cm~3, the λ value decreases rapidly with the decrease of water content. The water diffusion rate is related to the volumetric water content and particle size. The greater the moisture content is, the greater the diffusion rate will be. The larger the particle size, the larger the diffusion rate. The diffusivity of sandy loam is 10-30 times larger than that of loam and clay loam. The relationship between water content and diffusion rate is in accordance with the exponential function.
Horizontal soil column method was used to determine the horizontal diffusion rate of sandy loam, loam and clay loam under the same bulk density. The results showed that the migration rates of different lithological wet fronts were different. The sandy loam had the fastest migration rate, the loam followed, and the clay loam was the slowest, but the law of change is the same among the three lithologies. The volumetric water content affects the change of Boltzmann parameter λ. When the volumetric water content is between 0.35-0.45 cm~3/cm~3, λ approaches stability. When the volumetric water content is less than 0.35 cm~3/cm~3, the λ value decreases rapidly with the decrease of water content. The water diffusion rate is related to the volumetric water content and particle size. The greater the moisture content is, the greater the diffusion rate will be. The larger the particle size, the larger the diffusion rate. The diffusivity of sandy loam is 10-30 times larger than that of loam and clay loam. The relationship between water content and diffusion rate is in accordance with the exponential function.
引文
CHEN Peng,CHEN Kang,GAO Ye-xin.2018.Analysis of phreatic evaporation law and influence factors of typical lithology in Hebei Plain.Journal of Groundwater Science and Engineering,6(4):270-279.
DENG You-sheng,HE Ping,et al.2006.Experimental study of the hydraulic diffusivity of unsaturated saline soil.Journal of Glaciology and Geocryology,28(6):818-822.
DENG Jian-cai,LU Xin,et al.2005.Soil moisture diffusivity in Fengqu Region.Chinese Journal of Soil Science,36(3):317-320.
HU Shun-jun,LI Xiu-cang,et al.2009.Measurement of unsaturated soilwater diffusivity in cotton field of Araloasis irrigated district.Arid Land Geography,32(6):912-916.
LEI Zhi-dong,YANG Shi-xiu,XIE Sen-chuan.1988.Soil hydrodynamics.Beijing:Tsinghua University Press.
LIU Xin-ping,ZHANG Tong-hui,et al.2008.Water diffusivity of sandy soils of different particle sizes.Arid Land Geography,31(2):249-253.
LI Ying-qiang.1998.Unsaturated soil water diffusivity of lateritic red earth and its effect factors.Journal of South China Agricultural University,19(2):71-75.
MULIDEER·Tuohuojia,HUDAN·Tumarbay,LIZhuo-ran.2018.Determination of the water diffusivity in silt loam in typical area.Water Saving Irrigation,4:33-36.
SHAN Yu-yang,WANG Quan-jiu.2012.Simulation of salinity distribution in the overlap zone with double-point-source drip irrigation using hydrus-3D.Australian Journal of Crop Scinece,6(2):238-247.
SHAO Ming-an,WANG Quan-jiu,HUANG Mingbin.2006.Soil physics.Beijing:Higher Education Press.
TIAN Dan,QU Zhong-yi,et al.2013.Influence and mechanism analysis of biochar on water diffusivity of different soil textures.Chinese Journal of Soil Science,44(6):1374-1378.
WANG Quan-jiu,ZHANG Jiang-hui,FAN Jun.2006.An analytical method for relationship between hydraulic diffusevity and soil sorptivity.Pedo-sphere,16(4):444-450.
Waston K K.1966.An instantaneous profiles method of determining the hydraulic conductivity of unsaturated porous material.Water Resources Research,(2):709-715.
Williams R D,Ahujia Lajpat.2006.Evaluation of similar-media scaling and a one-parameter model for estimating the soil water characteristic.Journal of Soil Science,43:237-248.
XIE Sen-chuan,HUI Shi-bo,LI Hua-zhen.1982.Determination of water movement parameters in unsaturated soil.Hydrogeology Engineering Geology,5(1):8-15.
YAO Shu-xia,ZHAO Chuan-cheng,et al.2014.Soil moisture diffusivity in different habitats in Horqin Sand Land.Chinese Journal of Ecology,33(4):867-873.
DENG You-sheng,HE Ping,et al.2006.Experimental study of the hydraulic diffusivity of unsaturated saline soil.Journal of Glaciology and Geocryology,28(6):818-822.
DENG Jian-cai,LU Xin,et al.2005.Soil moisture diffusivity in Fengqu Region.Chinese Journal of Soil Science,36(3):317-320.
HU Shun-jun,LI Xiu-cang,et al.2009.Measurement of unsaturated soilwater diffusivity in cotton field of Araloasis irrigated district.Arid Land Geography,32(6):912-916.
LEI Zhi-dong,YANG Shi-xiu,XIE Sen-chuan.1988.Soil hydrodynamics.Beijing:Tsinghua University Press.
LIU Xin-ping,ZHANG Tong-hui,et al.2008.Water diffusivity of sandy soils of different particle sizes.Arid Land Geography,31(2):249-253.
LI Ying-qiang.1998.Unsaturated soil water diffusivity of lateritic red earth and its effect factors.Journal of South China Agricultural University,19(2):71-75.
MULIDEER·Tuohuojia,HUDAN·Tumarbay,LIZhuo-ran.2018.Determination of the water diffusivity in silt loam in typical area.Water Saving Irrigation,4:33-36.
SHAN Yu-yang,WANG Quan-jiu.2012.Simulation of salinity distribution in the overlap zone with double-point-source drip irrigation using hydrus-3D.Australian Journal of Crop Scinece,6(2):238-247.
SHAO Ming-an,WANG Quan-jiu,HUANG Mingbin.2006.Soil physics.Beijing:Higher Education Press.
TIAN Dan,QU Zhong-yi,et al.2013.Influence and mechanism analysis of biochar on water diffusivity of different soil textures.Chinese Journal of Soil Science,44(6):1374-1378.
WANG Quan-jiu,ZHANG Jiang-hui,FAN Jun.2006.An analytical method for relationship between hydraulic diffusevity and soil sorptivity.Pedo-sphere,16(4):444-450.
Waston K K.1966.An instantaneous profiles method of determining the hydraulic conductivity of unsaturated porous material.Water Resources Research,(2):709-715.
Williams R D,Ahujia Lajpat.2006.Evaluation of similar-media scaling and a one-parameter model for estimating the soil water characteristic.Journal of Soil Science,43:237-248.
XIE Sen-chuan,HUI Shi-bo,LI Hua-zhen.1982.Determination of water movement parameters in unsaturated soil.Hydrogeology Engineering Geology,5(1):8-15.
YAO Shu-xia,ZHAO Chuan-cheng,et al.2014.Soil moisture diffusivity in different habitats in Horqin Sand Land.Chinese Journal of Ecology,33(4):867-873.