19 results about "Wetting front" patented technology

A flash flood simulation method includes: obtaining a water storage in a vegetation root zone and obtaining an actual evaporation at any point in the vegetation root zone within a target watershed; obtaining a total infiltration rate in an unsaturated zone based on an infiltration model; obtaining a saturation overland flow and an interflow based on a vertical distance from a wetting front to a slope surface; updating an average saturated groundwater table depth based on the interflow and the total infiltration rate of the unsaturated zone; constructing a flash flood model for the target watershed based on the water storage of the vegetation root zone, the actual evaporation, the total infiltration rate of the unsaturated zone, the saturation overland flow, the interflow, and the average saturated groundwater table depth; and simulating an event-based flood hydrograph of the target watershed based on the flash flood model for the target watershed.

The invention provides a method and system for quantitatively analyzing a three-dimensional resistivity tomography result, and the method comprises the steps: obtaining a three-dimensional distribution diagram of moisture content, carrying out the sectioning at a fixed interval in a manner of being vertical to an X axis and a Y axis, and correspondingly obtaining a section set containing m YZ sections and a section set containing n XZ sections; when the water content of the soil is changed due to water infiltration, drawing an isoline based on a preset water content threshold value so as to define the position of a wetting front; respectively meshing the XZ profile set and the YZ profile set, and calculating the moisture infiltration coverage degree in each grid in combination with the wetting front position; determining the matrix inflow seepage depth of each section in the XZ section set and the YZ section set, and then calculating the priority flow fraction of each section in the XZ section set and the YZ section set; and analyzing the value of the priority flow fraction to determine the difference of the infiltration mode, and quantifying the difference of matrix inflow and infiltration depth. According to the method, the problem that the infiltration mode and the spatial heterogeneity index are not judged by using the resistivity tomography method is solved.

The present disclosure relates to a method for predicting soil hydraulic properties based on an upward infiltration experiment of a cutting ring soil sample. According to the new design approach, based on an inverse process of one-dimensional water upward infiltration analytical solution of homogeneous dry soils under a boundary condition of a constant pressure, by recording the data regarding cumulative infiltration amounts and infiltration times during the upward infiltration process of the cutting ring soil sample and a time for the wetting front to reach the upper surface of the cutting ring soil sample, a saturated hydraulic conductivity of the cutting ring soil sample is measured, and the soil hydraulic properties are quickly obtained. The present disclosure overcomes the defects that the methods in the prior art for measuring soil hydraulic properties are time consuming, low in efficiency, and not suitable for rapid acquisition of large area in the field, avoids the problems of multiple solutions and non-convergence of parameters, and improves the efficiency of acquiring soil hydraulic properties, thereby providing an effective means for the investigation of soil hydraulic properties in a large area in the field.

The present application relates to the field of agricultural planting irrigation technology, in particular to a kind of citrus water-saving cultivation method based on green production.The method obtains root system spatial distribution dielectric constant matrix through multi-channel time domain reflection sensor array, obtains wet body three-dimensional volume data through soil moisture dielectric sensor;Establish the infiltration model with drip irrigation working pressure and pulse duration as independent variables;Root system spatial distribution dielectric constant matrix and wet body three-dimensional volume data are calculated by spatial overlap rate, when the overlap rate of specific depth soil layer is lower than the preset threshold, the working pressure and pulse width of corresponding depth drip irrigation pipe are calculated and adjusted according to the infiltration model, so that the wetting front migration trajectory and high-density root system distribution space coincide.The present application eliminates the spatial misplacement of fixed wet body and irregular root system distribution, reduces the non-root area invalid water infiltration and deep seepage.

This invention discloses a method for interface-controlled seepage backfilling in power transmission and transformation disturbance zones, relating to the fields of soil engineering and soil and water conservation. Addressing the problem of discontinuous interface infiltration caused by differences in particle composition and compaction between upper and lower soil layers in power transmission and transformation disturbance zones, this invention first measures the particle composition and dry unit weight of the upper root zone backfill layer and the lower support layer to construct an interface abrupt change index, thereby determining whether a transition coordination layer should be set and the number of transition sub-layers. Then, a multi-layer transition structure is constructed using a combination of particle composition gradient interpolation and incremental compaction control value design. After backfilling, the method is checked and adjusted based on the arrival time and crossing time of the wetting front, as well as changes in water content on both sides. This method helps to improve the uncoordinated phenomenon of interlayer water migration, weaken local rapid channels or stagnation trends, and improve the stability of the backfill structure in the disturbance zone.

This invention discloses a method for estimating the size of soil wet bodies in drip irrigation. The process is as follows: Step 1, establish a soil wet body size estimation model; Step 2, simplify the model established in Step 1 into a dimensionless equation using dimensional analysis; Step 3, assume the relationship between the parameters in the dimensionless equation obtained in Step 2; Step 4, substitute the dimensionless equation obtained in Step 2 into the assumed relationship in Step 3 to obtain the soil wet body size estimation equation; Step 5, conduct simulation experiments using HYDRUS-2D / 3D software, and perform nonlinear regression analysis on the simulation results to determine the coefficients and exponents in the soil wet body size estimation equation obtained in Step 4. This invention solves the limitations of existing technologies that do not consider the influencing factor of initial moisture content, as well as the problems of inconvenient observation of the vertical wetting front movement distance of soil wet bodies during field irrigation, complex wet body size estimation methods, and low estimation accuracy.

The invention relates to the technical field of agricultural water-saving irrigation, in particular to a corn root zone water control infiltrating irrigation method which comprises the following steps: executing short pulse trial irrigation to generate a pulse response dictionary and a soil body structure parameter set by constructing a directional capillary structure on a root layer and arranging a negative pressure reference cavity; a threshold band is configured by taking root layer soil matrix potential as a control object, and a valve closed loop is realized by combining pulse shaping, a hysteresis switch and barrier constraint; carrying out sequential test on adjacent row bands by connecting a root layer soil matrix potential difference value with a stem flow decreasing amplitude in parallel so as to publish switching, integrating membrane flux according to a diffusion control model, and writing back transition parameters; and constructing hybrid automaton protection, and reconstructing a wetting front arrival time field by a fast marching method for self-calibration. The root zone water potential is stabilized, deep layer leakage is inhibited, and the water and fertilizer utilization efficiency is improved.

The application discloses a method for monitoring soil water infiltration and wetting front advance in situ, and vertically inserts a TDR probe into soil; uses a time domain reflectometer to measure TDR reflection signals before and during the infiltration process; extracts apparent position information of the probe head, tail and wetting front in the TDR reflection signal waveform, and then calculates the apparent length of the TDR probe and the wetting zone; and uses electromagnetic wave transmission theory to calculate the total infiltration water amount and the wetting front position. The application is simple to operate, and can realize the monitoring of the infiltration process only by inserting the probe into the infiltration area; the method is flexible, does not need to prepare special infiltration devices, and is suitable for any form of field infiltration conditions; the application has high integration, does not need other measurements, and can realize the high-frequency monitoring of the cumulative infiltration amount and the wetting front advance simultaneously by using one probe; and the application has strong applicability, and can be used in different texture soils. The application provides a powerful tool for soil hydrological property investigation and multi-scale soil hydrological process research.

The invention relates to the technical field of data processing, in particular to an agricultural production process monitoring and management system which comprises an environment analysis module, a wetting front module, a root zone analysis module, a collaborative gain module and an execution management module. According to the method, a time sequence is formed for multi-depth soil water content and environment signals, sequence smoothing is carried out, so that the soil state presents continuous change characteristics, boundary classification is constructed through water content difference, wetting promotion information is extracted, and a corresponding relation is formed between the wetting diffusion process and root zone absorption change. Root zone absorption characteristics are merged and analyzed through the change rate, management parameters are formed in combination with the wetting propulsion offset proportion, irrigation regulation and control are established on the basis of the continuous moisture dynamic and root zone response relation, moisture supply meets the root zone requirement, a control instruction has real-time performance and pertinence, and the irrigation efficiency is improved. The management result better conforms to the crop physiological process; and the resource utilization efficiency is improved.

The invention relates to a slope ecological restoration layer soil multi-mode intelligent irrigation moisture migration testing device and method. The method comprises the following steps: introducing characteristic value parameters of a wetting body, and testing and monitoring the moisture content and nutrients of the soil body; and a control variable method is combined to obtain a wetting front migration rule under the conditions of different gradients, different irrigation flows and different irrigation amounts and a soil moisture and nutrient distribution rule in a wetting body under the conditions of different gradients and different dripper flows. The system and the method have the beneficial effects that the problems of poor slope adaptability, insufficient monitoring precision and the like in the traditional technology are solved, and accurate testing and monitoring of a wetting front migration rule of a multi-mode irrigation ecological restoration layer with different gradients, irrigation amounts and irrigation flows and a soil moisture and nutrient distribution rule in a wetting body are realized; scientific guidance and data support can be provided for slope ecological restoration soil layer irrigation system design and optimization, ecological restoration layer material ratio optimization and maintenance irrigation work.

The invention relates to the technical field of ecological environment restoration, in particular to a method for low-disturbance improvement of soda salinized grassland, which comprises the following steps: applying a surfactant solution to determine that the infiltration promotion effect of a surfactant meets the requirement or does not meet the requirement, and determining a main limiting factor according to the pH value; a modifier solution is applied according to the adjusted improvement parameters, the modifier solution comprises organic acid and desulfurized gypsum, the wetting front advancing depth of the soil is obtained according to the initial detection period, and whether the wetting front of the soil can reach the target improvement depth or not is estimated; and according to the synergistic effect index, determining whether the degree that the combined use effect of the components is greater than the sum of the independent use effects of the components meets the expected requirement or not, and determining the judgment standard that the permeation promotion effect of the surfactant for adjusting the subsequent improvement circulation process does not meet the requirement and the initial detection period. The surfactant is combined with the modifier, so that the salinity and alkalinity of the soda salinized grassland are reduced, and the soil structure is improved.

The application discloses a high-precision small-interval soil wetting front monitoring system and relates to the technical field of soil moisture monitoring.The system comprises a plurality of high-resolution FDR or TDR moisture sensors, a laying mechanism and the like.The high-resolution FDR or TDR moisture sensors adopt a short-size probe structure and are suitable for small-interval laying scenes.The laying mechanism adopts a flexible support or a stepped module structure and can adapt to complex environments of different terrains and soil conditions.Meanwhile, each component module has good anti-interference capability and can be long-term stably operated in a harsh natural environment, thereby meeting the demand of long-term soil moisture monitoring of slope stability analysis, water and soil conservation and ecological restoration and the like in various complex environments.

A method for quickly acquiring soil hydraulic properties in situ based on a ponded infiltration experiment is provided. The method adopts a novel derivation method, and is based on a Richards' equation and a Brooks-Corey model to derive an analytical solution that accurately describes one-dimensional infiltration into homogeneous soil under ponded conditions. The method, for the first time, provides a detailed description of a developing saturated zone in the soil water profile, which is the most vital infiltration characteristic during ponded infiltration. The method proposes an optimized estimation method for parameters based on an inverse process of the analytical solution. The method can quickly acquire soil hydraulic properties in situ field by measuring a cumulative infiltration amount and a length of a wetting front over time during one-dimensional ponded infiltration experiment through a time-domain reflectometer (TDR).

The invention provides a method for analyzing time-varying stability of a side slope of a power transmission tower under the action of rainfall, which belongs to the technical field of engineering geological analysis and comprises the following steps: analyzing water content distribution of soil during rainfall, and constructing a method for acquiring unit weight of soil in a transfer layer according to the water content distribution; establishing a slope rainfall infiltration process analysis model considering the soil moisture content layering phenomenon; the slope body stress is vertically and equivalently divided into a plurality of strip blocks; on the basis of the analysis model, obtaining wetting front data of the slope at different rainfall moments, soil body layered moisture content distribution and unit weight of soil in a transfer layer, and further obtaining gravity distribution of each block at different rainfall moments; and the time-varying safety coefficient of the slope in the rainfall process is solved through iterative calculation. The method has the advantages that based on the water content gradient distribution characteristics of a soil saturation layer, a transfer layer and a natural layer, the time-varying distribution rule of the soil gravity in the rainfall infiltration process is quantified in combination with a wetting front dynamic propulsion model, and the gravity calculation accuracy is improved.

The invention relates to the technical field of water and soil simulation analysis, in particular to a slope infiltration and stability analysis method, medium and equipment under a double rainfall algorithm, and the method comprises the following steps: describing a water binding capacity parameter A by using saturated water content, initial water content and underground water burial depth; introducing a water binding capacity parameter A, and deducing an empirical formula of soil moisture content to obtain a side slope moisture content distribution model after rainfall; the rainfall process is divided into a complete infiltration stage and an incomplete infiltration stage, and a segmented expression of the rainfall infiltration rate is obtained; deducing the change relation of the wetting front depth along with rainfall time according to the law of conservation of rainfall; according to the change relation of the wetting front depth along with the rainfall time, the safety coefficient of the side slope at a certain rainfall moment is calculated. According to the method, high-precision simulation of the process of slope instability induced by heavy rainfall is realized by introducing a water binding capacity parameter fitting soil moisture content formula, rainfall subsection infiltration analysis and a double rainfall calculation method, so that slope disaster early warning is performed.

The invention relates to the technical field of cotton cultivation management, and discloses a cotton dry sowing and wet output precise management method based on water and fertilizer space-time matching, which comprises the following steps: starting a drip irrigation pipe network after dry sowing, adjusting fluid flow, and utilizing wetting front pushing to drive salt to move towards a non-planting area; monitoring soil matrix potential and water evaporation rate, and identifying an evaporation stage switching point; the liquid organic fertilizer is connected to the distribution channel at the switching point, an organic colloid component is utilized to generate an adsorption layer on the inner wall of a soil micropore, a pore wall surface contact angle is changed, a capillary path for moisture conduction is blocked, and meanwhile multivalent cations are utilized to induce clay particles to form a flocculation structure and generate microcracks. And the crusting continuity is destroyed by utilizing the self-constriction characteristic of a flocculation structure, the mechanical resistance of seedling emergence is eliminated, and the water-salt environment of a root domain is improved.

The application discloses a special mixing equipment for emulsification of spreadable cheese sauce and a preparation process thereof, relates to the technical field of emulsification preparation of cheese sauce, and comprises a tank body, a shearing emulsification head arranged in the tank body and a powder injection system. The tank body is provided with a temperature control system for heating or cooling materials in the tank. The application further comprises a liftable eccentric flow guide cylinder. In the application, the flow field is positioned by a barrier, and the intelligent closed-loop control of the barrier being broken by the flow field fundamentally solves the coupling problem of powder caking and circulation dead zones. The three-dimensional motion of the liftable eccentric flow guide cylinder reconstructs the macroscopic flow field, accurately guides the main fluid to the barrier area to form directional impact, the angle-adjustable nozzle accurately delivers the powder jet to the preset wetting front in front of the barrier in the form of pulses, the eccentric design of the bottom of the auxiliary stirring paddle and the partial disturbance of the side wall effectively prevent deposition and enhance local mixing, and the three forces are concentrated in the barrier area to realize active tracking and directional breaking of the rheological barrier.

The invention discloses an unsaturated soil foundation strength deterioration evaluation method and system considering a water immersion effect, and relates to the technical field of geotechnical engineering and electric power infrastructure safety, and the method comprises the following steps: obtaining water content state monitoring data of a foundation under a water immersion condition, determining a wetting front position based on the monitoring data, and extracting a propagation characteristic quantity of the wetting front position; based on the propagation characteristic quantity and the change rate of the water-containing state, matrix suction is corrected, and evolution suction is obtained; comparing the water content state with a preset structure starting criterion, determining an over-threshold water content increment, and accumulating to obtain a structure damage state quantity; based on the structural damage state quantity, an attenuation function is constructed to carry out attenuation modulation on the evolution suction, and equivalent shear strength is obtained; and outputting a foundation strength deterioration evaluation result based on the equivalent shear strength. According to the invention, a closed loop from data monitoring to safety early warning is realized, and a dynamic and accurate evaluation means is provided for foundation safety in an operation period.

The present application relates to the technical field of slope stability evaluation in geotechnical engineering, and particularly relates to a multi-layer soil infiltration and slope stability analysis method considering dynamic correction of infiltration coefficient, which can be used for prediction and prevention and control of shallow landslide disaster. S1: obtaining basic parameters of a multi-layer soil slope to be analyzed; S2: constructing a single-layer Green-Ampt infiltration model with transition layer correction; S3: constructing an enhanced multi-layer Green-Ampt infiltration model; S4: constructing a multi-layer soil slope stability analysis model; S5: result verification and comparative analysis. The method process of the present application is simple, the simulation accuracy is improved through dynamic correction of the transition zone infiltration coefficient, the retarding effect of the low-permeability interface on the wetting front is quantified, the stability coefficient is corrected by multiple factors, the traditional method is avoided to overestimate the safety of the slope, and the present application can directly provide quantitative basis for landslide early warning, anti-seepage design of the multi-layer soil slope.