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1871results about "Rainfall/precipitation gauges" patented technology

System for predicting geologic hazard based on rainfall intensity, moisture content of slope soil and deformation

The invention discloses a system for predicting geologic hazard based on rainfall intensity, moisture content of slope soil and deformation. The system comprises an automatic rainfall gauge, a soil moisture sensor, an omnibearing tilt sensor, an omnibearing vision sensor, an embedded system and a monitoring center computer, wherein the automatic rainfall gauge is used for monitoring rainfall and rainfall intensity of a geologic hazard point; the soil moisture sensor is used for monitoring moisture in soil at the geologic hazard point; the omnibearing tilt sensor is used for detecting earth surface deformation and internal deformation of the geologic hazard point; the omnibearing vision sensor is used for evaluating geologic hazard scale; the embedded system is used for wirelessly transmitting video and monitoring data; and the monitoring center computer is used for predicting and forecasting the geologic hazard and comprises a communication module, a data receiving module, a rainfall and rainfall intensity-based geologic hazard prediction module, a slope displacement-time curve-based geologic hazard prediction module, a soil moisture, rainfall and rainfall intensity-based geologichazard prediction module and a soil moisture content and slope deformation-based geologic hazard prediction module. The system has the advantages of complete monitoring means, accurate prediction andforecast, high intelligence and on-line real time.
Owner:ZHEJIANG UNIV OF TECH

Method and system for monitoring power transmission line of power grid

ActiveUS20140123750A1Reliable online monitoringPreventing and reducing accidents of the power transmission lineRainfall/precipitation gaugesWeather/light/corrosion resistanceElectric power transmissionCurrent sensor
A system for monitoring a power transmission line of a power grid, including a first comprehensive sensor (402, 502) disposed at the intermediate position of a power transmission line between two towers including an altimeter, a first acceleration sensor, a temperature and humidity sensor and a rainfall sensor; a second comprehensive sensor (404, 504) disposed at the cable connector of the power transmission line including a leakage current sensor, a tension sensor and a wind speed and direction sensor; and a second acceleration sensor (406, 506) disposed at the intermediate position of the power transmission line between the cable connector of the power transmission line and the first comprehensive sensor (402, 502). A method for monitoring a power transmission line of a power grid, including a step of monitoring the sag condition, wind yaw angle, motion and position tracking, flutter conditions, breeze vibration level, fatigue life and icing situation of a power transmission line. The method and system for monitoring a power transmission line of a power grid effectively prevent and reduce incidents of the power transmission line of the power grid based on sensor multi-dimensional sensing technology combined with the advantages of wireless sensor network technology.
Owner:STATE GRID INFORMATION & TELECOMM BRANCH

Ground daily rainfall predicting method based on satellite remote sensing and regression Kriging

The invention discloses a ground daily rainfall predicting method based on satellite remote sensing and regression Kriging. The method comprises the steps that firstly, data are fast obtained through satellite remote sensing, and a regression relation among ground-based observation values, TRMM, DEMs and geographic positions of rainfall capacities of all levels is established according to the classification of the rainfall to obtain regression estimated values and regression residual errors of all levels; secondly, the spatial agglomeration degrees of the regression residual errors of all levels are analyzed, the trend removing is carried out on the regression residual errors, and the Kriging interpolation of the regression residual errors is carried out to obtain the regression residual error spatial distribution characteristics of all levels per 1 km; thirdly, the regression estimated values of all levels and the regression residual errors of all levels are added to obtain the ground-based predicting values of rainfall of all levels per 1 km; lastly, the ground-based predicting values of the rainfall of all levels are merged to obtain a daily rainfall predicting value per 1 km. According to the ground daily rainfall predicting method, the spatial and temporal distribution characteristics of the ground-based rainfall can be accurately predicted, the predicting precision of the ground daily rainfall is improved, the predicted space resolution is improved, and the key problem that the water conservancy department predicts the ground rainfall is solved.
Owner:ZHEJIANG UNIV

Monitoring and Mapping of Atmospheric Phenomena

A computerized system for mapping an atmospheric phenomenon in a geographic region. Multiple free-space electromagnetic communications links are previously distributed in the geographic region. The system includes an interface to monitoring mechanisms attached respectively to the free-space electromagnetic communications links. The monitoring mechanisms respectively monitor attenuation levels of the free-space electromagnetic communications links. A processor simultaneously processes the attenuation levels, and maps in the geographic region the atmospheric phenomenon. The simultaneous processing preferably applies a non-linear model which relates the attenuation levels the atmospheric phenomenon, and solves a tomographic problem based on the non-linear model and the attenuation levels. The tomographic problem is preferably solved by an interactive algorithm based on consecutive refinement and linear inversion at each iteration. Alternatively, an interpolation is performed based on respective inverse distance from the communications links. Preferably, the interpolation is further based on respective lengths of communications links. A data interface preferably provides to subscribers temporal information related to the atmospheric phenomenon within portions of the geographic region.
Owner:RAMOT AT TEL AVIV UNIV LTD

Urban rainstorm waterlogging assessment and modeling method

The invention discloses an urban rainstorm waterlogging assessment and modeling method. The method comprises the steps that an urban earth's surface runoff producing model is established, a time-integration method is adopted to calculate accumulated infiltration and accumulated produced runoff at a moment t, wherein t represents rainfall time; according to the calculated accumulated infiltration and accumulated produced runoff at the moment t, hour-by-hour continuous simulation is conducted on a ponding zone and ponding depth of rainstorm waterlogging by obtaining the rainfall capacity hour by hour and utilizing an equal-volume method, and an urban earth's surface confluence model is established to obtain urban rainstorm waterlogging simulation result at corresponding moment. The time-integration method is adopted to respectively process a water permeable zone and a water non-permeable zone, hour-by-hour continuous simulation can be performed by inputting hour-by-hour rainfall capacities, and real-time forecasting and estimation of the rainstorm waterlogging are achieved through butt joint with rainfall forecasting. According to the method, the whole urban waterlogging and water receding process is considered, and hour-by-hour elaborate simulation of urban waterlogging can be achieved, so that real-time operation influencing the model in forecasting becomes possible.
Owner:上海市气象灾害防御技术中心

Intelligent irrigation rain sensor

An intelligent irrigation rain sensor for use in an irrigation system comprises a rain sensor unit and a sensor control unit. The rain sensor unit has a rain catcher reservoir with an open top for receiving rainwater. The rain catcher has an internal volume for holding water and tapers into a funnel with an opening for metering equally sized round water droplets at a steady-state drip rate. At least one droplet detector is positioned directly below the funnel opening that contacts the water droplets from the funnel. The droplet detector includes detection electrodes for sensing a change in an electrical property being monitored by a detection control in the sensor control unit. Each droplet detected may be counted and the droplet count retained in a memory, or excluded from counting based on certain factors, such as the drip rate between droplets from the funnel opening. Upon exceeding a rain threshold amount over measurement time period, the intelligent irrigation rain sensor issues a rain signal to the irrigation controller. The intelligent irrigation rain sensor issues a corresponding dry signal to the irrigation controller after a drying period has elapsed. The present intelligent irrigation rain sensor may issue consecutive rain signals and accumulate drying periods for each, up to a predetermined limit, before issuing a single dry signal to the irrigation controller.
Owner:TELSCO INDS

Debris flow early warning method

The invention discloses a debris flow early warning method. Aiming at the technical problem that the prior art cannot solve calculation and determination of early warning rainfall threshold value of a debris flow early warning system in a basic data information lacking region, the invention provides the debris flow early warning method applied in the basic data information lacking region. The method comprises the following steps of: arranging rainfall monitoring sites at reasonable places of a debris flow valley; taking the sum of 1hr rainfall intensity value of rainfall data of the rainfall monitoring sites and early affected rainfall value as an early warning rainfall threshold value; calculating and determining the early warning rainfall threshold value of each site based on a debris flow starting mechanism by using the data of rainfall, hydrographic characteristic, terrain in the valley, loose solid substances and the like of a debris flow early warning region, presetting each threshold value in the early warning system, and judging whether to start the early warning system for early warning through the real-time comparison result of the real-time rainfall data and the threshold values. In the method, the principle is reliable, the calculation process is scientific and simple, implementing equipment is simple and installation is convenient, and the method can be universally applied to the requirements of debris flow early warning of various debris flow regions.
Owner:INST OF MOUNTAIN HAZARDS & ENVIRONMENT CHINESE ACADEMY OF SCI

Regional automatic weather station hourly rainfall data quality control method

ActiveCN106950614AImproving Observational Data QualityRainfall/precipitation gaugesICT adaptationWeather radarRainfall estimation
The invention discloses a regional automatic weather station hourly rainfall data quality control method. The method comprises the steps that a discriminant model is established according to historical data; raindrop spectrometer data, weather radar data and automatic weather station rainfall data are collated in real time; the data of a number of raindrop spectrometers are used to evaluate and revise a radar echo intensity result; the relationship between the radar echo intensity and the rain intensity is fitted according to different precipitation types; the fitted relationship is substituted into a radar quantitative estimation precipitation module to realize radar quantitative rainfall estimation to acquire hourly rainfall; the set of weather radar estimated hourly rainfall and regional automatic weather station hourly rainfall is established; and comparing with the pre-established discriminant model is carried out to judge whether the regional automatic weather station hourly rainfall data are abnormal. The automatic weather station rainfall data are accurate and reliable. The observation data quality is improved. The method lays a good foundation for weather monitoring, early warning, forecasting and other businesses.
Owner:中船鹏力(南京)大气海洋信息系统有限公司

Rainfall measurement method based on video images

The invention provides a rainfall measurement method based on video images. For rainfall videos acquired by a video camera, the logarithmic image processing (LIP) method is adopted to replace the brightness value with gray tone and build gray tone constraint conditions to extract candidate raindrops; the principal component analysis (PCA) method is utilized to build a probability density distribution function of the inclination directions of the candidate raindrops, the Mean-shift method is adopted to derive and solve the peak value of the distribution function, and the inclination directions of the candidate raindrops are constrained to remove interference; defocusing raindrops are removed through constrain on the included angle between color vectors of both the scene background and the raindrop foreground; the size of each focusing raindrop is demarcated and calculated by parameters of a camera, a raindrop spectrum is built and the rainfall is derived by utilizing a Gamma raindrop spectrum distribution model in a fitting manner. According to the invention, a traditional rainfall measurement method is broken through, and the video-based measurement method is innovatively provided; rainfall data acquired by adopting the video-based measurement method has very high time resolution and spatial resolution; and economization and rapidness are realized.
Owner:南京汇川图像视觉技术有限公司

X-band dual-polarization weather radar quantitative precipitation measurement method and system

An embodiment of the invention provides an X-band dual-polarization weather radar quantitative precipitation measurement method and an X-band dual-polarization weather radar quantitative precipitationmeasurement system. The X-band dual-polarization weather radar quantitative precipitation measurement method comprises the steps of: utilizing an X-band dual-polarization radar to obtain radar data in a detection range, and using a laser raindrop spectrograph to obtain an actually measured raindrop spectrum of a detection point; acquiring a radar reflectivity factor and an attenuation rate; acquiring an actually measured rainfall rate and a radar reflectivity factor true value of the detection point based on the actually measured raindrop spectrum, acquiring an attenuation rate true value ofthe detection point through T matrix scattering simulation, acquiring a rainfall function in the detection range through fitting the actually measured rainfall rate and the attenuation rate true value, and further acquiring a rainfall rate; inverting the rainfall rate by using the attenuation rate if the radar reflectivity factor is greater than a first set threshold value; and acquiring an attenuation rate function in the detection range through fitting the radar reflectivity factor true value and the attenuation rate true value is the radar reflectivity factor is not greater than the first set threshold value, and then acquiring a rainfall rate in the detection range based on the attenuation rate function. The X-band dual-polarization weather radar quantitative precipitation measurementmethod and the X-band dual-polarization weather radar quantitative precipitation measurement system can acquire more precise predicted rainfall rates.
Owner:INST OF ATMOSPHERIC PHYSICS CHINESE ACADEMY SCI
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