The Soil Conservation Monitorins Information System (SCMIS) presented in this paper is oriented to soil erosion control, resources exploitation, utilization, planning and management for a small watershed (about 10 sq....The Soil Conservation Monitorins Information System (SCMIS) presented in this paper is oriented to soil erosion control, resources exploitation, utilization, planning and management for a small watershed (about 10 sq. km.) on the Loess Plateau. It sums up Remote sensing (RS), Geographical Information System (GIS) and Expert System (ES) and consists of a integrated system. As a basic level information system of Loess Plateau, its perfection and psreading will bring about a great advance in resources exploitation and management of Loess Plateau.展开更多
A utility equipment used in soil science is designed and installed.The equipment can be used in research pro- grams of soil water and solute transport.Pressure in pressure chamber of the equipment in which a tested so...A utility equipment used in soil science is designed and installed.The equipment can be used in research pro- grams of soil water and solute transport.Pressure in pressure chamber of the equipment in which a tested soil sam- ple is laid can be adjusted exactly so that we can determine the water content of soil sample.With the equipment we can not only study the problems related water movement in soil but also measure some solute,such as cadmi- um,plumbum and so on,adsorption on surface of soil in saturated and unsaturated state.As an illustration of the use of the equipment,we give the isothermal of cupric ion adsorption in soil.This equipment can be used in the re- search work and application of soil science.展开更多
Geotechnical studies are essential in civil engineering for all building and infrastructure projects. Typically, in-situ studies involving soil sample collection through drilling are conducted. However, these invasive...Geotechnical studies are essential in civil engineering for all building and infrastructure projects. Typically, in-situ studies involving soil sample collection through drilling are conducted. However, these invasive methods can be costly when numerous boreholes are needed to assess stratum continuity or are impractical for examining subsurface conditions beneath existing structures. Shallow geophysical exploration offers several non-invasive alternatives for subsurface characterization, with Electrical Resistivity Tomography (ERT) being particularly versatile. ERT provides detailed and accurate subsurface images through a relatively simple and fast field implementation. For this study, four 2D ERT profiles were designed and performed near three buildings at the Centro Universitario de la Costa in Puerto Vallarta, Jalisco, Mexico, using a Gito-1100 V resistivity meter from Hematec with Dipole-Dipole arrays. Basic descriptive statistics were calculated for each data set to establish criteria for outlier removal, optimizing the inversion process in Res2DInv software. The inversion results defined five geoelectric units [UG-1 (1 to 20 Ω‧m), UG-2 (20 to 40 Ω‧m), UG-3 (40 to 100 Ω‧m), UG-4 (100 to 500 Ω‧m), and UG-5 (750 to 1000 Ω‧m)], consistent with previously identified geologic materials. The 2D ERT profiles allowed for the identification of lateral variations in moisture content and saturation and determined the depth of consolidated and possibly cemented materials suitable for future infrastructure projects on the university campus. This work provides a reference framework for implementing the 2D-ERT technique in Puerto Vallarta, supporting its use as a non-invasive alternative for effective subsurface characterization in geotechnical and civil engineering contexts.展开更多
文摘The Soil Conservation Monitorins Information System (SCMIS) presented in this paper is oriented to soil erosion control, resources exploitation, utilization, planning and management for a small watershed (about 10 sq. km.) on the Loess Plateau. It sums up Remote sensing (RS), Geographical Information System (GIS) and Expert System (ES) and consists of a integrated system. As a basic level information system of Loess Plateau, its perfection and psreading will bring about a great advance in resources exploitation and management of Loess Plateau.
文摘A utility equipment used in soil science is designed and installed.The equipment can be used in research pro- grams of soil water and solute transport.Pressure in pressure chamber of the equipment in which a tested soil sam- ple is laid can be adjusted exactly so that we can determine the water content of soil sample.With the equipment we can not only study the problems related water movement in soil but also measure some solute,such as cadmi- um,plumbum and so on,adsorption on surface of soil in saturated and unsaturated state.As an illustration of the use of the equipment,we give the isothermal of cupric ion adsorption in soil.This equipment can be used in the re- search work and application of soil science.
文摘Geotechnical studies are essential in civil engineering for all building and infrastructure projects. Typically, in-situ studies involving soil sample collection through drilling are conducted. However, these invasive methods can be costly when numerous boreholes are needed to assess stratum continuity or are impractical for examining subsurface conditions beneath existing structures. Shallow geophysical exploration offers several non-invasive alternatives for subsurface characterization, with Electrical Resistivity Tomography (ERT) being particularly versatile. ERT provides detailed and accurate subsurface images through a relatively simple and fast field implementation. For this study, four 2D ERT profiles were designed and performed near three buildings at the Centro Universitario de la Costa in Puerto Vallarta, Jalisco, Mexico, using a Gito-1100 V resistivity meter from Hematec with Dipole-Dipole arrays. Basic descriptive statistics were calculated for each data set to establish criteria for outlier removal, optimizing the inversion process in Res2DInv software. The inversion results defined five geoelectric units [UG-1 (1 to 20 Ω‧m), UG-2 (20 to 40 Ω‧m), UG-3 (40 to 100 Ω‧m), UG-4 (100 to 500 Ω‧m), and UG-5 (750 to 1000 Ω‧m)], consistent with previously identified geologic materials. The 2D ERT profiles allowed for the identification of lateral variations in moisture content and saturation and determined the depth of consolidated and possibly cemented materials suitable for future infrastructure projects on the university campus. This work provides a reference framework for implementing the 2D-ERT technique in Puerto Vallarta, supporting its use as a non-invasive alternative for effective subsurface characterization in geotechnical and civil engineering contexts.
