11 results about "Soil evaporation" patented technology

The invention belongs to the technical field of ecological hydrology, and particularly discloses a forest underlying surface earth surface evapotranspiration estimation and component segmentation method based on kNDVI. According to the method, based on a maximum entropy increase model, under the constraint of a surface energy balance equation, the surface state parameters of a forest vegetation-free area are used for resolving to obtain the soil evaporation capacity of the bare soil; on the basis of a maximum entropy increase model, under the constraint of a canopy energy balance equation, the vegetation transpiration amount is obtained through calculation according to the canopy state parameters of the forest vegetation coverage area; calculating the canopy interception evaporation capacity according to the leaf area index and the rainfall capacity of the forest vegetation coverage area; and finally, based on the kNDVI index, carrying out weighted summation on the bare soil evaporation amount, the vegetation evaporation amount and the canopy interception evaporation amount in the forest to obtain the total evapotranspiration of the underlying surface of the forest. Compared with an existing evapotranspiration estimation model, the forest underlying surface earth surface evapotranspiration estimation method is lower in complexity and higher in estimation precision.

The utility model relates to the field of soil detection, in particular to a desert wetland soil evaporation capacity detection device. The desert wetland soil evaporation capacity detection device provided by the utility model can be used for detecting the moisture of soil in the evaporation dish while detecting the moisture of soil at different depths, is convenient to compare, improves the accuracy and reliability of detection and is convenient to use. A desert wetland soil evaporation capacity detection device comprises a placement table, insertion rods and the like, and the left and right parts of the placement table are connected with the front and rear insertion rods. Changes of soil moisture in the evaporation dish are measured at regular time through the weighing device and recorded, meanwhile, the soil moisture sensor is moved to different depths to detect and record the moisture in the soil, and then the evaporation capacity is calculated through data comparison. Therefore, moisture of soil in the evaporation pan can be detected while moisture of soil at different depths is detected, comparison is facilitated, detection accuracy and reliability are improved, and use is convenient.

The application relates to the technical field of soil evaporation and seepage measuring systems, in particular to a soil evaporation and seepage measuring system based on hydraulic connection, which comprises a power mechanism, a hydraulic connection conveying mechanism arranged below the power mechanism, and a detection mechanism arranged at the bottom of the hydraulic connection conveying mechanism. The detection mechanism comprises a detection barrel, a first fixing frame arranged around the outer circle of the detection barrel, two first fixing frames arranged at the upper and lower ends of the detection barrel respectively, a sensing device arranged on the first fixing frame at the upper end, and a second fixing frame arranged on the first fixing frame at the lower end. The soil to be measured is contacted with the soil on the ground, the soil on the ground is loaded onto a soil loading table, the power mechanism is started to drive the hydraulic connection conveying mechanism to contact the detection mechanism, and the moisture in the soil during detection is closer to the reality, so that the test data is accurate.

The application discloses a kind of based on dynamic canopy extinction coefficient evapotranspiration calculation and component splitting method, applied to farmland crop irrigation field, the method includes: discerning the main control factor of canopy extinction coefficient change;Based on main control factor, construct canopy extinction coefficient dynamic change law quantitative representation function;It is nested into single-source Penman-Monteith model or double-source Shuttleworth-Wallace model to replace conventional extinction coefficient fixed value scheme, and then estimate farmland evapotranspiration and its components (soil evaporation and crop transpiration).The application realizes the accurate quantitative representation of the dynamic change law of extinction coefficient.Compared with the traditional fixed value scheme, although the simulation effect of total evapotranspiration is slightly improved, the accuracy of component splitting of evapotranspiration can be effectively improved, i.e.the accuracy of the proportion of evaporation and transpiration.Compared with the proportion of evaporation and transpiration, the effect is stable and reliable after being verified in many places.

The application discloses a kind of desert soil evaporation field in-situ monitoring system and data processing method and application, system includes sensor acquisition module, data transmission module and output platform.Taking soil bucket contains undisturbed soil column, bottom support is weighed on the weighing disc in weighing cylinder, and weighing module is composed of weighing disc, sensor support, weighing sensor and bottom sealing disc.Taking soil bucket and the clearance of weighing cylinder are equipped with sand and water proof sealing ring.Weighing transmitter and 4G collector are packaged in joint sealing windproof sand box, and power supply uses solar panel with local latitude plus 5 ° and buried battery combination.Output platform is based on dynamic threshold method processing quality data: mean and standard deviation are calculated in sliding time window, and k times standard deviation is dynamic threshold value;When continuous multiple data points exceed the sum of mean and threshold value and continuously rise, it is determined that it is rainfall event and data is retained, to avoid false deletion real signal.The application effectively solves the problem of evaporation calculation distortion under desert extreme environment, realizes long-term automatic monitoring.

The application provides a method and device for determining the amount of surface evapotranspiration, wherein the method comprises: processing remote sensing monitoring data of a surface into remote sensing monitoring data of the surface with consistent spatial and temporal resolutions; calculating vegetation transpiration, soil evaporation, canopy interception evaporation, water body evaporation and ice and snow sublimation in a target region according to the remote sensing monitoring data of the surface with consistent spatial and temporal resolutions; and determining the total amount of surface evapotranspiration in the target region according to the vegetation transpiration, soil evaporation, canopy interception evaporation, water body evaporation and ice and snow sublimation in the target region. The above technical solution improves the accuracy of the determination of the amount of evapotranspiration and realizes continuous high-resolution estimation of evapotranspiration.

The application discloses a kind of multifunctional compound planting system evapotranspiration process dynamic monitoring device and method, lysimeter measuring cylinder is arranged in the upper portion of lysimeter filter layer, soil evaporation barrel and intercropping crop lysimeter barrel are buried in the soil of lysimeter measuring cylinder top portion, soil moisture sensor is connected to the outer wall of one side of lysimeter measuring cylinder, automatic water supply device is connected to the bottom of the outer wall of the other side, with automatic water supply device is located in the same side, groundwater supply device and water level gauge are equipped in the bottom of lysimeter filter layer, the other side is equipped with drain pipe, drain pipe is connected with leakage device, lysimeter filter layer bottom is connected with weighing sensor, drip irrigation belt is arranged in crop row;Based on lysimeter weight, soil moisture, irrigation data, automatic water supply data, groundwater recharge data, drainage data, leakage data and meteorological data, the change of soil storage water quantity is calculated.The application can accurately characterize the evapotranspiration process of compound system.

The application provides a method for dividing surface evapotranspiration components based on dual-source Penman-Monteith, which comprises the following steps: step 1, collecting meteorological data; step 2, constructing function expressions of ecosystem Penman-Monteith, vegetation canopy Penman-Monteith and soil layer Penman-Monteith based on the collected meteorological data; step 3, substituting the Penman-Monteith expressions in step 2 into energy balance equation and water vapor balance equation to deduce plant transpiration and soil evaporation division factors; and step 4, calculating plant transpiration and soil evaporation according to the division factors. The application can accurately divide the ecosystem evapotranspiration into plant transpiration and soil evaporation by only using conventional meteorological data driving. The application can provide a theoretical basis for ecosystem evapotranspiration component simulation, technical support for improving the calculation efficiency of existing global models in the process of ecosystem evapotranspiration component simulation, and a scientific basis for ecological hydrology research.

The invention discloses a sudden drought simulation device, and relates to the technical field of agricultural meteorology, and the sudden drought simulation device comprises an experiment setting and integration module, an air supply pipeline design module, a required air speed estimation module and a fan selection control module. Based on a fluid static pressure conservation principle, wind with uniform speed can be output, the uncertainty of influence of wind speed space difference on an analysis result is reduced, local wind speed sudden change is avoided, the uniformity of an evaporation process is ensured, and the wind speed required in a sudden drought process is quantified through a required wind speed estimation module. According to the device, soil evaporation is accelerated through uniform air supply, the repeatability and accuracy of an experiment are ensured, it can be ensured that the relative humidity of soil is reduced to a target value within the set time under the limited control condition, and the repeatability and precision of the experiment are improved.

The invention relates to the technical field of soil evaporation test systems, in particular to a soil evaporation test system. Comprising the steps that a soil column simulation device contains a simulation soil column; the temperature control evaporation device regulates and controls the current evaporation temperature; the precipitation device controls the current precipitation amount; the salt concentration collecting device collects the current salt concentration; the gas permeability sensor collects current gas diffusion rates of the simulated soil column at different depths; the salt concentration supply device provides a salt solution; the hierarchical data acquisition device acquires corresponding temperatures, pH values, conductivity and nitrogen migration amounts at different depths; and the electronic equipment takes the current evaporation temperature, the current precipitation, the current salt concentration and each current gas diffusion rate as input, and takes the temperature, the pH value, the conductivity and the nitrogen migration amount corresponding to each depth as output, the initial soil column data prediction network is trained, and a target soil column data prediction model is obtained. The accurate simulation of the process of water-salt migration along with nitrogen migration of the saline-alkali soil is realized.

The application discloses a kind of high-efficiency soil remediation equipment of turnover, belong to soil remediation technical field.The application includes bottom plate and be set in the stirring cavity and filter cavity of bottom plate top end, the side of stirring cavity in the top of bottom plate and be equipped with heating cavity, heating cavity is connected with stirring cavity by trachea, stirring cavity is connected with filter cavity by connecting pipe, the top of bottom plate and be equipped with support in the two sides of heating cavity symmetry, one side support is installed with heating air blowing equipment, the side of two side supports corresponding all be equipped with slide, slide middle part is connected with heating cavity by the movable shaft on support, heating cavity two sides symmetry is equipped with heating cavity ear, and in addition two sides of vertical have up-and-down staggered top plate.The application uses hydraulic cylinder to promote heating cavity to rise, utilizes gravity to make heating cavity overturn, soil continues to overturn after evaporating once, increases evaporation time, so that soil evaporation is more sufficient, improves efficiency.