Identify duty-free items via HS code

List of contents of this article:

• 1,Identify duty-free items via HS codeIntroduction to flood forecasting system
• 2, How can China's flood forecast whistle accurately in advance?
• 3, What is the purpose and significance of flood forecasting?

Introduction to the flood forecasting system

The operating system that realizes the online operation of flood forecasting on the computer is called the flood forecasting system. The development of modern computer and communication technology has integrated the collection, transmission and processing of rain information, the calculation and analysis of the mathematical model of flood forecasting, and the distribution services of forecast information.

The operating system of the flood forecasting system that realizes the online operation of flood forecasting on the computer is called the flood forecasting system.

The flood forecasting system generally includes 6 subsystems, namely: historical and real-time data collection system; data transmission system; database management (data processing and storage) system; forecasting model (or empirical forecasting scheme) calculation and correction system; forecasting release system;Forecast and evaluation system.

A flood forecasting system can be large or small, simple or complex due to the differences in its development purpose, requirements and scale. Use mathematical models to realize online forecasting operations and reduce the heavy labor of forecasters, which is the most basic function of the flood forecasting system.

How can China's flood forecast whistle accurately in advance?

It is mainly for scientific researchers to establish a flood forecasting system to simulate the whole process of rainfall from the beginning to the end to judge the occurrence of floods and their development trends, and then achieve advance forecasting.

Meteorological warning Meteorological early warning is one of the most commonly used methods for predicting Bairan disasters at present. Through ground observation, satellite remote sensing and other means, meteorological disasters, such as typhoons, rainstorms, snowstorms, etc., can be accurately predicted.At the same time, measures can also be taken in advance according to the weather forecast to minimize the harm caused by natural disasters to human beings.

Model establishment: According to the data collected and analyzed, a hydrometric forecasting model can be established. These models can include flood models, rainfall runoff models, etc. The model can predict the future hydrological situation based on historical data and future weather forecast and other information.

The flood forecast is generally 2 to 3 days in advance, and the warning accuracy is high. It is notified to people by provinces, municipalities and towns. The information channels are mainly TV, the Internet and newspapers, and it can also be inquired by phone.

is to use satellites, radars and computers to comprehensively process the hydrometeorological data collected by telemetry before the flood arrives, and accurately forecast the flood peak and flood volume., flood characteristic values such as flood level, flow rate, flood arrival time, flood duration, etc., carry out flood scheduling and organize residents to evacuate and rescue, so as to reduce flood losses.

Improve the ability to cope with floods. Improve the accuracy of flood forecasting and warning: Accurate flood forecasting can preview flood peak transit in advance, find problems and solve problems. The flood control plan generated based on accurate forecast data will be more scientific, which can reduce flood losses and ensure the safety of people's lives and property.

What is the purpose and significance of flood forecasting?

The purpose is to predict the occurrence and change trend of short-term, medium-term and long-term river floods. It is the decision-making basis for the scheduling and application of flood control and rescue and flood control systems, for water resourcesRational utilization and protection, construction, management and application of water conservancy projects, and safe production services for industry and agriculture.

Flood forecasting and dispatching is an important non-engineering measure in the construction of water conservancy and hydropower projects. It plays an important role in ensuring the safe operation of the project.

The significance is as follows: improve the scientificity of flood control and rescue command and decision-making: accurate flood forecasting and predictive analysis can provide a timely and accurate basis for the scheduling of flood control projects.

The forecast items generally include the flood peak water level or flood peak flow and its occurrence time, the process of flood rise and fall and the total amount of flood. Most of the flood forecasting methods are empirical methods based on the theory of production flow and confluence. At present, the combined application of satellite remote sensing technology and rain radar with the hydrological forecasting model has further improved the predictability and accuracy of the forecast.

Hydrology forecasting is an important aspect of hydrology for economic and social services, especially for forecasting disastrous hydrological phenomena and short-term, medium-term and long-term forecasting for the comprehensive use of large-scale water conservancy hubs, which plays a great role.