According to the transport theory of soil solutes and the conditions of soil,geology and climate in the karst region of Guizhou Province,a numerical simulation model of edaphic nitrogen element transport under field c...According to the transport theory of soil solutes and the conditions of soil,geology and climate in the karst region of Guizhou Province,a numerical simulation model of edaphic nitrogen element transport under field conditions is initially established.In this model,NO-3 and NH+4 are regarded as soil solutes.Transformation mechanisms such as biological release,bio-immobilization,ammonium adsorption-desorption,nitration-denitrification and factors of crop root uptaking are considered in this model.It is hoped that the data from this model could directly be used to guide agricultural production in this region and offer feasible ways to improve the use of nitrogen element,sustainable development of agriculture in karst mountainous areas and natural environment.展开更多
In this paper, the hydraulic characteristics of the fracture-karst aquifer and the distribution patterns of petrochemical contaminants are studied. Then, a numerical model using the mixed Eulerian-Lagrangian approach ...In this paper, the hydraulic characteristics of the fracture-karst aquifer and the distribution patterns of petrochemical contaminants are studied. Then, a numerical model using the mixed Eulerian-Lagrangian approach is constructed to predict the distribution and transport of petrochemical compounds in groundwater. The results of numerical modelling and sensitivity analysis show that it may be a workable way for aquifer remediation to combine contamination sources control and capture zone establishment.展开更多
According to the theory of preferred plane, preferred planes (faults) alwayscontrol the distribution of bedrock fissure water and hold abundant groundwater. Thus, theexploration of fissure or karst water can be conver...According to the theory of preferred plane, preferred planes (faults) alwayscontrol the distribution of bedrock fissure water and hold abundant groundwater. Thus, theexploration of fissure or karst water can be converted into searching for the watery preferred plane(WPP). In the paper, the characteristic of watery preferred planes is analyzed and a series ofsuperior indices has been set up. It is introduced that WPPs are determined by the methods ofgeological analysis, superior index and complex geophysical analysis. Meanwhile, new multiple modelfor water resource development in the water-scarce areas of karst mountainous regions are advanced.展开更多
This article uses TM images in 1999 and 2006 in Dahua County,selects the driving factors having great impact on urban land use change,and conducts data processing using GIS software.It then uses CLUE-S model to simula...This article uses TM images in 1999 and 2006 in Dahua County,selects the driving factors having great impact on urban land use change,and conducts data processing using GIS software.It then uses CLUE-S model to simulate land use change pattern in 2006,and uses land use map in 2006 to test the simulation results.The results show that the simulation achieves good effect,indicating that we can use CLUE-S model to simulate the future urban land use change in karst areas,to provide scientific decision-making support for sustainable development of land use.展开更多
在贵州喀斯特地区,地表径流通过土壤裂隙、岩溶管道等途径流失,限制了地表径流的形成。文章以龙里羊鸡冲小流域为研究区,基于2013-2019年的实测数据,修正SWAT(Soil and Water Assessment Tool)模型的裂隙流模块,修改了裂缝入渗的表示方...在贵州喀斯特地区,地表径流通过土壤裂隙、岩溶管道等途径流失,限制了地表径流的形成。文章以龙里羊鸡冲小流域为研究区,基于2013-2019年的实测数据,修正SWAT(Soil and Water Assessment Tool)模型的裂隙流模块,修改了裂缝入渗的表示方法,对修正前后的日径流模拟进行对比分析。结果表明:率定期内纳什系数由0.32提升到0.60,决定系数由提高0.37提升到0.58。在验证期内,纳什系数由0.52提高到0.55,决定系数由0.56提高到0.60,修正后的模型与原模型相比具有更好的适用性。修正后模型的径流时间序列与实测数据更吻合,能合理估算研究区的入渗水量,为喀斯特小流域的水资源管理提供参考依据。展开更多
基金Granted jointly by the Ministry of Science and Technology of China (Grant No. 2006CB403200)the National Natural Science Foundation of China (Grant No. 40773069)
文摘According to the transport theory of soil solutes and the conditions of soil,geology and climate in the karst region of Guizhou Province,a numerical simulation model of edaphic nitrogen element transport under field conditions is initially established.In this model,NO-3 and NH+4 are regarded as soil solutes.Transformation mechanisms such as biological release,bio-immobilization,ammonium adsorption-desorption,nitration-denitrification and factors of crop root uptaking are considered in this model.It is hoped that the data from this model could directly be used to guide agricultural production in this region and offer feasible ways to improve the use of nitrogen element,sustainable development of agriculture in karst mountainous areas and natural environment.
基金This research project was supported by the National Natural Science Foundation of China(grants 49772162 and 40002022)the Doctoral Foundation of China(grant 1999028421).
文摘In this paper, the hydraulic characteristics of the fracture-karst aquifer and the distribution patterns of petrochemical contaminants are studied. Then, a numerical model using the mixed Eulerian-Lagrangian approach is constructed to predict the distribution and transport of petrochemical compounds in groundwater. The results of numerical modelling and sensitivity analysis show that it may be a workable way for aquifer remediation to combine contamination sources control and capture zone establishment.
文摘According to the theory of preferred plane, preferred planes (faults) alwayscontrol the distribution of bedrock fissure water and hold abundant groundwater. Thus, theexploration of fissure or karst water can be converted into searching for the watery preferred plane(WPP). In the paper, the characteristic of watery preferred planes is analyzed and a series ofsuperior indices has been set up. It is introduced that WPPs are determined by the methods ofgeological analysis, superior index and complex geophysical analysis. Meanwhile, new multiple modelfor water resource development in the water-scarce areas of karst mountainous regions are advanced.
文摘This article uses TM images in 1999 and 2006 in Dahua County,selects the driving factors having great impact on urban land use change,and conducts data processing using GIS software.It then uses CLUE-S model to simulate land use change pattern in 2006,and uses land use map in 2006 to test the simulation results.The results show that the simulation achieves good effect,indicating that we can use CLUE-S model to simulate the future urban land use change in karst areas,to provide scientific decision-making support for sustainable development of land use.
文摘在贵州喀斯特地区,地表径流通过土壤裂隙、岩溶管道等途径流失,限制了地表径流的形成。文章以龙里羊鸡冲小流域为研究区,基于2013-2019年的实测数据,修正SWAT(Soil and Water Assessment Tool)模型的裂隙流模块,修改了裂缝入渗的表示方法,对修正前后的日径流模拟进行对比分析。结果表明:率定期内纳什系数由0.32提升到0.60,决定系数由提高0.37提升到0.58。在验证期内,纳什系数由0.52提高到0.55,决定系数由0.56提高到0.60,修正后的模型与原模型相比具有更好的适用性。修正后模型的径流时间序列与实测数据更吻合,能合理估算研究区的入渗水量,为喀斯特小流域的水资源管理提供参考依据。
