36 results about "Groundwater depth" patented technology

The portable groundwater depth-determining sampling device, sampling system and sampling method of the present invention belong to the field of site pollution investigation and risk assessment. By setting a movable barrier air bag, the stagnant water located at the upper and lower ends of the groundwater sampling probe in the well pipe is effectively blocked. It can accurately collect groundwater samples at the depth where the sampling probe is located, avoiding the problem of sample dilution caused by the mixing of upper and lower water samples in the well pipe during the traditional method of well cleaning and sampling, and improving the accuracy of concentration detection. The invention can accurately collect groundwater samples at different depths in the same monitoring well, realize fixed-depth sampling, and significantly reduce costs. In addition, the present invention effectively blocks stagnant water in the upper and lower layers of the groundwater sampling probe in the well pipe, which can reduce the volume of well washing before sampling, save sampling time, improve sampling efficiency, reduce the production of well washing waste water, and further reduce sampling costs. Reduce the disturbance to the groundwater in the well pipe and ensure the accuracy of the detected concentration.

The invention discloses a groundwater depth-fixed sampling probe, a sampling system and a sampling method using the probe. The groundwater depth-fixed sampling probe comprises: a quick-connect joint; The joint is arranged at the opening; the bottom threaded cap; the inner liner, the inner liner is arranged between the top threaded cap and the bottom threaded cap, and the inner liner is provided with a plurality of holes; and the outer sleeve, The outer casing is set between the top threaded cap and the bottom threaded cap, the outer casing is set outside the inner liner, and a plurality of holes are arranged on the outer casing; wherein, the top threaded cap and the bottom threaded cap It is connected with the outer sleeve through the inner liner, and the diameter of the multiple holes on the outer sleeve is smaller than the diameter of the multiple holes on the inner liner; among them, the quick-connect joint, the top threaded cap, the bottom thread The plug cap, inner liner, and outer sleeve are made of stainless steel.

The invention discloses a partition optimization method for crop irrigation systems in shallow groundwater buried areas. It includes: obtaining local historical data; using the Aquacrop model based on local historical data to obtain the first simulated yield and simulated water consumption at each growth stage of crops and wheat under different irrigation systems in different regions, and the set groundwater depth is used as the divisional boundary in different regions ;According to all the first simulated yields and the corresponding simulated water consumption in each growth stage, the second simulated yield and the stage sensitivity coefficients of different growth stages of all regional crops under each water production function model are obtained by using the set multiple water production function models or index; calculate the coefficient of determination between the first simulated yield and the second simulated yield; use the stage sensitivity coefficient or index and the determination coefficient to determine the best water production function model corresponding to each region; put the stage under the best water production function model The sensitivity coefficient or index is used as the irrigation decision-making variable, and combined with setting the irrigation quota, the irrigation system is obtained by using Aquacrop.

The invention relates to a quick method for relieving water deficit of plants in arid desert areas. According to the method, the stimulation effect of water supply on a soil seed bank, the range in which soil condensate appears easily, the influence of a canopy structure on condensed water and a condensing surface made of dense nylon screens are used, so that the formation of hydroscopic water in different ranges, atmospheric water vapor condensed water and soil water vapor condensed water is promoted, an effective water supply is provided for the germination and seedling emergence of the soil seed bank, the plants are helped to overcome drought, and then the aim of relieving the water deficit of the plants in the arid desert areas is fulfilled. By the method, the survival rate of annual plants in the arid desert areas in which the amount of precipitation is less than 150mm, the amount of evaporation is more than 2,000mm and the groundwater depth is large (3 to 4m) is improved, and the invalid dissipation of the condensed water is avoided.

The invention discloses a soil profile water utilization calculation method based on profile water content and groundwater burial depth. The main steps are as follows: data preparation and inspection; Calculate the moisture content of the profile; select the calculation area to calculate the soil profile water storage; finally use the difference between the soil profile water storage at the beginning and the end of the calculation period to obtain the soil profile water utilization; at the same time, use the water storage change in the groundwater depth variation zone to calculate The groundwater utilization in the saturated zone is obtained, and the soil water utilization in the unsaturated zone is further reversed to obtain the vertical distribution of water utilization in the soil profile. The invention uses the measured water content data and extends it to the entire calculation section, and calculates the groundwater utilization in the saturated zone and the soil water utilization in the unsaturated zone by segmenting the calculation area, which is the source of distinguishing the water utilization in the soil profile. Data support is provided.

The invention discloses a sampler for underground water at a fixed depth. The sampler sequentially comprises at least two connecting pipes, a sampling base pipe and a one-way water stop device from top to bottom, wherein the sampling base pipe and the connecting pipes are detachably fixed to form an interpenetrating sampling cavity; the sampling base pipe is communicated with the one-way water stop device through a sleeve type telescopic joint; the one-way water stop device comprises a funnel and a funnel bushing; the upper end of the telescopic joint and the lower end of the sampling base pipe are hermetically fixed; the lower end of the telescopic joint is in threaded connection with the funnel bushing; the funnel is arranged in the space formed by the funnel bushing and the telescopic joint; the lower part of the funnel extends out of the funnel bushing, and the upper end part of the funnel is clamped with the interior of the funnel bushing; and the funnel is tightly sealed with thelower edge of the funnel bushing. During sampling, the funnel moves upward by virtue of the thrust force of water, and the funnel is separated from the lower edge of the funnel bushing to form a water inlet channel; and when the sampling is finished, the sampler is lifted, and the funnel moves downward and is tightly sealed with the funnel bushing to reach a water stop state. The sampler is simple in structure, diverse in sampling mode, convenient to carry, easy to operate, high in controllability and capable of sampling water at the fixed depth.

The invention relates to a soil salinization critical groundwater depth calculation method. The method comprises the steps that a soil type is determined; soil texture is determined; a soil capillaryequivalent pore diameter is calculated; a temperature range is determined; surface tension of water is determined; a salinization critical value is determined; and critical depth is calculated. According to the method, by analyzing the principle that salt is brought to the surface under the action of groundwater capillaries, the soil salinization process is elaborated, and the critical depth causing soil salinization is defined; and a calculation function of a key parameter, namely the soil equivalent pore diameter, in a rise height theoretical formula of capillary water is derived, the maximum rise height of the capillary water is used as a calculation objective, and a salinization model is constructed to determine the soil salinization groundwater critical depth. The method is clear in physical process and action mechanism, has universality for solving the soil salinization problem caused by excessively high groundwater and provides reliable theoretical and technical support for guiding reasonable development and utilization of groundwater resources and governance of soil salinization.

The invention discloses an artificial drainage and dewatering, cushion and low-energy replacement dynamic compaction shallow foundation strengthening method. The method mainly comprises the construction steps that (1) surface cleaning and field leveling are carried out; (2) surveying and positioning are carried out; (3) artificial drainage and dewatering are carried out, wherein artificial vacuum well-point dewatering can be adopted; (4) a cushion, such as mountain skin stone or gravel, with the thickness ranging from 500 mm to 1000 mm is paved; (5) low-energy dynamic compaction replacement construction is carried out, wherein the manners of dynamic compaction replacement, two times of point compaction and one time of full compaction are adopted, a column hammer is firstly adopted for impact holing, layered filling and layered punching and enlarging compaction is adopted to form a replacement pillar body, and after a dynamic compaction replacement point is completed, the manners of two times of point compaction and one time of full compaction are adopted for conducting dynamic compaction until the process is completed; and (6) dynamic compaction monitoring and detecting are carried out. According to the artificial drainage and dewatering, cushion and low-energy replacement dynamic compaction shallow foundation strengthening method, the strengthening effect on shallow foundation soil is obvious, the constructing cost is low, and the practicability is high. The strengthening method is particularly suitable for shallow strengthening of large-area treatment zones with small groundwater depth and low shallow foundation soil bearing force and incapable of achieving safe walking of construction machines and engineering requiring the foundation bearing force not larger than 80 KPa.

The invention discloses a method for estimating ground water reasonable buried depth of a planted forest and belongs to the technical field of intersection of the forestry ecological project technology and the environmental monitoring technology. The method includes the following steps: determining a plurality of ground water sampling points in small areas representing different landforms, soils, plants and growth condition backgrounds of planted forest areas in the different areas of the planted forest, measuring actual ground water buried depth of the ground water sampling points, collecting plant types and growth condition grade of the plants that the ground water sampling points correspond to, acquiring a group of ground water reasonable buried depth ensuring normal growth of the plants under the ground of specified sample areas according to the collected information and further estimating the ground water reasonable buried depth of the planted forest. The method provides a new model and a new way for quantified checking of the ground water buried depth under the background of planted forest and provides reasonable effective accordance for sustainable management of the planted forest.