Smart Web GIS visualization platform for urban flood prevention and emergency management

Foreword

This year, the No. 17 typhoon "Lion Mountain" (tropical storm class) landed on Hainan Island. Affected by the "Lion Mountain", heavy rains to heavy rains and local heavy rains occurred in the northern half of Hainan Island. The strong wind and rain brought about by the typhoon caused trees to fall in many parts of Hainan Island, water accumulated on the roads, and continuous heavy precipitation caused multiple dangerous warnings.

If preventive measures can be taken before the typhoon comes, losses will be effectively reduced. The focus of flood prevention work is on prevention. For the monitoring of future meteorological conditions, key defenses of geological hazards and dangerous sections are indispensable. Prepare enough emergency and disaster relief supplies in advance to build a "steel long embankment". Control the real-time water volume data of roads, bridges, tunnels and other hidden danger points, and transfer people and materials before exceeding the warning water level.

effect display

Use Hightopo's self-developed product HT for Web, combined with GIS, to realize the timely arrangement, timely arrangement, timely rescue, and timely rescue of flood prevention and disaster relief work. In the GIS system, a diversified visualization display of massive POI data, traffic flow data, planning data, current status data, etc. is carried out. Based on the collected rainfall information, deduce the arrival time of the flood, and remind the residents of the community and the reservoir staff.

Geographic Information System (GIS), with the support of computer hardware and software systems, collects, stores, manages, calculates, analyzes, displays and describes related geographic distribution data in the entire or part of the earth's surface (including the atmosphere) space Technical system. A simple latitude and longitude coordinate can only be recognized and understood by users after it is placed in specific geographic information, represented as a certain place, sign, and orientation. GIS enables emergency planners to easily calculate emergency response time in the case of natural disasters.

Taking the map of Xiamen as an example, it simulated the typhoon that caused heavy rainfall after landing, leading to flooding, and finally implemented the entire rescue process. Use GIS to display the geographic information of Xiamen City, combine Beidou, 5G, smart cameras, and cloud computing to realize the monitoring of hidden danger points and the precise positioning of trapped persons, reducing personal injuries and property losses. The impact of the typhoon is immeasurable, and the damage caused may also be unbearable. Therefore, the corresponding equipment must be inspected before the typhoon comes to avoid accidents.

system analysis

weather warning

The animation shows the movement of the typhoon. The red curve is the typhoon's transit route. The average rainfall and maximum rainfall passing through the city increase rapidly with the arrival of the typhoon.

weather conditions

In areas along the coastal lakes in the middle and low latitudes, strong weather systems such as typhoons, extratropical cyclones, strong winds from cold fronts, and sudden changes in air pressure can cause abnormal water surface elevations. It and the accompanying squally winds and waves can cause water levels to rise and trigger floods. HT can display the 24-hour weather as a line graph by accessing real-time weather data, which is convenient for managers to predict emergencies. Drag the mouse left or right to view the weather in the next 7 days, and make a long-term plan for flood prevention.

Typhoon intensity

Depending on the typhoon level, different defensive measures are taken. For example: ①Government and related departments do a good job of typhoon emergency and rescue work in accordance with their duties; ②Stop gatherings, suspension of classes, and business suspension (except for special industries); ③Ships returning to port for shelter should take active measures according to the situation and properly arrange personnel to stay behind or Move to a safe area; ④ Reinforce or dismantle structures that are easily blown by the wind. Personnel should stay in a safe place against wind. When the center of the typhoon passes by, the wind will decrease or remain static for a period of time. Remember that strong winds will blow suddenly. Continue to stay in a safe place to avoid wind, and timely transfer of people from dangerous houses; ⑤Relevant areas should pay attention to preventing mountain torrents and geological disasters that may be caused by heavy rainfall.

infrastructure

Urban emergency avoidance platforms, fire and civil air defense facilities, and emergency medical rescue facilities have become the new focus of urban infrastructure construction, and they are also the main support for people to avoid danger. Urban infrastructure must not only maintain a good operating condition, but also ensure that it will not be interrupted when natural disasters come. Improve the safety factor of urban infrastructure, build dual and multiple circuits for power supply, backup water sources, backup gas sources, backup heat sources, backup channels, etc., to improve flood resistance.

water conservancy facilities

Water conservancy facilities are a checkpoint for flood prevention. The number of sluices, pumping stations, and reservoirs shows the city's flood resistance. Install sensors in relevant flood control equipment or use F5G technology to achieve low-latency, millisecond-level data transmission, and timely drainage and flood discharge.

Warning information

The warning signals of different colors indicate the landing time and wind strength of the typhoon.

Typhoon weather is likely to cause problems such as pipe bursts, which may lead to water and power outages and other consequences. While receiving the typhoon warning, it is also necessary to reserve corresponding resources. Reserve food and water for the family for a few days in advance, as well as some essential medicines for emergency use.

Predicted precipitation

Through the data binding of the HT visualized 2D panel and the chart, as well as the use of different styles of chart statistics to display various data information of the typhoon, predict the next 3 hours, 6 hours, and 12 hours of precipitation in various districts of Xiamen, such as certain predictions If there will be continuous heavy rainfall in districts and counties, more rescue supplies can be equipped.

Predicted precipitation area

After real-time data is connected, the water level will change with precipitation. Green means below the warning line, and orange means the water level exceeds the warning line. When the warning water level is exceeded, emergency preventive measures can be taken.

real-time monitoring

When a typhoon passes through the border, the amount of precipitation is large, and rivers and lakes and reservoirs have been running at high water levels for a long time. Water conservancy departments at all levels are under greater pressure. It is necessary to carry out monitoring at all times, effectively carry out project scheduling, pay close attention to weather changes, make timely flood forecasting and information release, and provide information support for decision-making at all levels.

real-time rainfall

The rainfall heat map is used to visually display the amount of rainfall, and the green-yellow-red represents the gradual increase in rainfall. When a large area of red area appears on the map, it indicates that the probability of flooding has increased, and countermeasures can be made in advance. Residents living in low-lying areas can be notified to adopt "small encirclement" measures based on local conditions, such as building fences, placing water baffles at gates, and installing small pumps.

precipitation statistics

Statistics on the duration of precipitation, the city's average rainfall, the city's maximum rainfall, and the real-time data of rainfall in each district, compare and analyze the current statistics of precipitation data with historical data to predict the probability and level of flooding. For example, when Shanxi encountered floods, the rainfall amounted to more than 3 times the average annual rainfall in October. The data of multiple stations broke the historical extreme value of the same period since the station was established, and the maximum accumulated precipitation was 285.2 mm.

Precipitation area

The precipitation area of each district in Xiamen is separately counted, and the radar chart is connected to real-time data to show the change of precipitation area. When there is continuous heavy precipitation in a certain area, the relevant departments should be notified immediately to prepare for flood discharge, and rescue supplies should be prepared.

reservoir water level

According to the hydrological conditions of the river, the topographic and geological conditions of the dam site and the water requirements of various water-using departments, through adjustment calculations, and comprehensive comprehensive analysis and demonstration from political, technical, economic and other aspects, various characteristic water levels and characteristics of the reservoir are determined. The corresponding storage capacity value. The characteristic water levels of reservoirs mainly include normal water storage level, dead water level, flood control limit water level, flood control high water level, design flood level, check flood level, etc. Each reservoir is replaced by a pyramid, and the water level is shown with a gradual change of color. The blue spread to the top of the pyramid indicates that the real-time water level has reached the limit of the reservoir and the flood needs to be discharged in time. The powerful rendering capability of the HT engine ensures that the "flood prevention emergency management platform" loads and runs efficiently and smoothly on the Web, and ensures excellent gradation effects.

Precipitation in each reservoir

Continuous heavy rainfall will cause the water level of the reservoir to rise rapidly, exceeding the flood control limit water level and the flood control high water level. The reservoirs in Xiamen are listed separately, and comprehensive monitoring of reservoirs in various districts can be carried out.

Reservoir flood discharge

Large and medium-sized reservoirs operating at high water levels should perform flood control operations in accordance with the forecast and actual conditions to avoid flood risks. The total discharge flow is updated in real time, the opening height of each gate and the discharge flow are separately counted, and the discharge speed and precipitation of the 2D panel are compared and analyzed. The people of the village moved.

Smart dams have higher regulation and control capabilities for water level control and flood discharge. You can learn something from the videos of the Three Gorges Dam, water conservancy and hydropower projects and other cases.

River water level

The 2D panel is used to monitor the water level and ensure the water level. Under the premise of ensuring the safety of the reservoir, reduce the flow of the downstream river, block the flood and reduce the peak and stagger the peak, and use the diversion sluice along the line to divert as much flood as possible to reduce the pressure of the river. Overall consideration of river basin water conditions, scientific implementation of river basin joint dispatching, timely distribution of floods, and ensuring that the project maximizes the benefits of flood prevention and disaster reduction. Many lakes are distributed in low-lying areas on both sides of rivers in our country, which are natural places for flood regulation and storage. However, with the increase in population and economic development, the phenomenon of land competition between people and water has become more and more serious. A large number of lakes have been reclaimed, and the storage volume has been drastically reduced, which has aggravated flood disasters.

Emergency rescue

Danger is the order, and rescue is urgent. When all the flood prevention measures are used, the floods still cannot be stopped, and we can only actively carry out post-disaster rescue. In the estuary area, when river floods, storm surge floods and astronomical tides encounter, flood disasters will become more serious.

River rescue

The 3D scene of the river channel adopts a lightweight modeling scheme, and the accurate restoration of the river channel position is realized through the Hightopo self-developed engine combined with GIS. The GIS engine can accurately synchronize with the 3D scene, which not only retains the effects and functions of the GIS engine, but at the same time does not limit the designer's performance in the 3D scene; the corresponding 2D drawings adapt to screens of various scales and solve different screens. The display problem under the ratio.

The green, blue, and pink dots in the scene represent the response time of relevant departments, the local garrison, and the People's Armed Forces Ministry. The pink covered area is the submerged area on both sides of the river. The progress bar below shows the progress of the river flooding and the response speed of the rescue department. The response speed will vary depending on the road conditions, and the response time can be different, and nearby personnel can be dispatched.

Disaster situation

Master flood information based on monitoring data and disseminate it to the people through various media. People can choose the best route to evacuate calmly in light of their location and conditions to avoid the passive situation of "people come first before they go through the water", and people who have been affected should be sent to emergency resettlement points as soon as possible. The number of houses collapsed, circuit interruption, highway interruption, number of people affected, economic loss, etc. are the primary statistical data after the disaster. The data of various departments lined with chimneys are unifiedly presented through HT for Web, and then integrated and analyzed, so that scientific rescue can be carried out. .

Water accumulation points in various districts

After the flood, low-lying areas will produce stagnant water. Count the accumulation of water in roads, underground wells, and tunnels and upload them to the relevant map APP. Fully implement the dynamic real-time information interaction between vehicles, vehicles and roads, and carry out active vehicle safety control and road collaborative management based on the collection and fusion of all-time-space dynamic traffic information, fully realize the effective coordination of people, vehicles and roads, ensure traffic safety, and improve Traffic efficiency.

Water accumulation point

Accurately locate the water accumulation point through HT for Web GIS, and place the mouse on the cylinder representing the water accumulation point to view the depth of the water accumulation, the location of the water accumulation, the trapped people and vehicles, and whether there are people in emergency rescue, etc. Cylinders with varying heights represent the depth of stagnant water. The higher the column, the deeper the stagnant water.

stagnant point treatment

The processed and unprocessed numbers are notified in time, and the data is updated in real time. If the pavement with stagnant water is closed in advance, perhaps the tragedy of the commuter car wading and overturning in Pingshan, Hebei will not be staged. People have mastered the location of the stagnant point, and they can also go around in advance to avoid falling into the stagnant area. For tunnels and other areas prone to water accumulation, the depth of water accumulation can be notified through smart monitoring.

relief supplies

Medical resources are a powerful guarantee for people’s health. Living materials such as mineral water, instant noodles, ham sausages, tents, quilts, raincoats and rain boots are the hope of people’s lives. Emergency shelters provide shelter from the wind and rain. Inflatable life jackets and non-inflatable life jackets. , Water safety belts and other life-saving equipment can save lives. Statistics and scientific management of the use of various materials are truly prepared.

Material warehouse occupancy rate

Access real-time data to display material stacking conditions, and make rational use of warehouse resources and rescue materials.

Rescue personnel

Rescue personnel in each district are counted separately, and personnel are allocated according to the degree of disaster, so that the trapped personnel can be treated quickly.

personnel trapped

The position obtained from the Beidou satellite navigation system, the data collected by cameras, digital scanners, lidars, aircraft and satellites, can be directly input into the GIS to determine the location information of the trapped persons. Check the number of people trapped in different areas in time to facilitate the distribution of rescue materials and the dispatch of rescue equipment.

Click on the orange circle to drill down to the secondary page to view the full path of rescuers receiving rescue missions-rescuing the victims-sending them to the resettlement site. Rescuers can upload photos of the rescue scene so that other search and rescue personnel can judge the area. The degree of difficulty of rescue.

summary

This year, the 17th typhoon "Lion Rock" and the 18th typhoon "Compasses" landed successively. The interval between the two typhoons is less than 5 days, and their impact ranges are highly overlapped. The superimposed effects are obvious, which poses a greater threat to people's lives. Tupu's flood prevention emergency management platform can effectively predict risks and notify the people to prepare medicines and food in advance. Real-time data detection can shorten rescue time and is an important tool for managers to conduct scientific management and control during flood seasons.

Tupu has always insisted on localization for many years. The core product HT for Web independently developed by itself has independent intellectual property rights and does not rely on third-party commercial or open source libraries. It satisfies the modern, high-performance, cross-platform (desktop Mouse/Mobile Touch) of the Industrial Internet of Things. /Virtual reality (VR) data visualization requirements. Based on partial refresh, batch aggregation, image caching, minimizing DOM elements, etc., the ultimate performance is pursued from the bottom of the design. The components can withstand tens of thousands or even 100,000 levels of data, breaking the application limits of many traditional industries.

For more industry application examples, please refer to the case link of Software's official website: 161a8ae4a74694 https://www.hightopo.com/demos/index.html