The typhoon walk why so much water?
- Details
- Category: Ningbo News
- Published: Friday, 10 August 2012 11:39
Source 2012-8-10 8:55:06 Southeast Business
"Anemones" lopsided, but the flooding waterlogging has not followed abatement, Ningbo, there are many places water, Fenghua Eguchi, West Hollywood, Yin southeast and north cicheng and other parts of flooded gravity. Many people did not understand: that the typhoon is already in transit, the weather began to turn for the better, why so much water also? The person in charge of the municipal government of flood and drought control headquarters said that subjected to the 1956 "August typhoon after the strongest typhoon in Ningbo, coupled with the tidal range to water, location, and many other factors, making the city a number of regional flood water disaster, will take 5 to 7 days to basically drained.
Correspondent reporter Zhang Hao Hu Zhang
Rainfall to break the record
The strongest typhoon in the case of 1956
Reporters learned from the municipal flood and drought control headquarters, "anemones" 1956 "August Typhoon, landing the intensity of the strongest typhoon in the city. "Ill intent" strong typhoons bring stormy weather.
Municipal Meteorological Bureau, Zhou Fu, a senior weather experts said in an interview, "anemone" with the August 1988 landing the Xiangshan 8807 Typhoon strikingly similar to the typhoon in coastal development, the process of wind, the city's area rainfall aspects of a record.
City hydrological station data show that the eve of 20:00, the city's process of rainfall reached 237 mm, the maximum point in Ninghai Korea stand 568 mm, followed by 528 mm Mao Yang Station. There are three sites of more than 500 mm, accounting for 1% of the total, 32 sites more than 400 mm, accounting for 10% of the total, 104 sites of more than 300 mm, accounting for 31% of the total. From the township of view, the cumulative rainfall exceeding 400 mm in 12 townships (538 mm maximum Ninghai Hu Chen), over 300 mm of 26 townships, more than 200 mm, 63 townships, more than 100 mm in 112 townships .
200 mm or even four or five hundred millimeters of rain, coming down in Ningbo, Ningbo floods "culprit".
River water level forcing up
Ningbo City spillway slow
Caused by floods, in addition to heavy rainfall, as well as many other negative factors superimposed. "Person in charge of the municipal government of flood and drought control headquarters that.
Zhang Tuo, the Municipal Water Conservancy Bureau, the original said, "'anemones' storm surge has brought much more than we expected, we had originally expected to be 1 to 1.5 meters, the actual increase in water 2 to 3 m tide of Sanjiangkou 'anemones' comes up to 3.12 meters, has a record second-highest on record, only about 10 cm lower than the 1997 on the 11th typhoon period.
City Water Conservancy Bureau to provide reporters with a set of data: the Yaojiang basin rainfall of 260 mm, 262 million cubic meters of water, the Fenghua River and Yongjiang main stream rainfall of 267 mm, 701 million cubic meters of water, Yongjiang basin rainfall of 221 mm, 963 million cubic meters of water, the convergence of three rivers rapidly forcing up the water level, making the city spillway slow.
Ningbo hydrological data show a higher tide, river water to inland, a large number of river water did not break out, resulting in some sections and low-lying land plot also appeared in stagnant water.
The person in charge of the municipal government of flood and drought control headquarters said that the tidal range is also an important indicator of the affect area drainage capacity. The tidal range tidal cycle, the difference between the adjacent high tide and low tide, with the time and place. The city's coastal tidal range is small, with an average tidal range of only 0.60 meters, which is a direct result of the slow-down in the river flow rate and drainage capacity will be restricted.
Geographical impact
Coastal plain and easy a long time flood
As of August 9 at 2:00 pm, the central city is more serious in low-lying, water location 104, the third area 56. Among them, the water Haishu District, Liu Ting overpass under 21 in the Willow River under the bridge next to the pine trees near the road, the water has led to the roadside trash soaked in water.
From the day before yesterday morning, the city urban waterlogging situation an emergency, the central urban area to a large area of stagnant water, and waterlogging spread to the chip from the point of waterlogging.
The person in charge of the municipal government of flood and drought control headquarters said that the local floods more serious, as well as the geographical impact. The topography of the city from southwest to northeast tilt, eastern and northern coastal areas of less than 10 meters above sea level, the water network, rivers and lakes connected to the flat, Siming Mountains from southwest to northeast extension of, toward the basic and parallel to the coastline, every time a typhoon because of the terrain uplifting, and often heavy rains. Acute short-circuiting of the city's river source downstream tidal, whenever heavy rain, rivers upstream set flow, while the downstream drainage is poor, coupled with tidal backwater caused by prolonged floods, to the plains.
The official said that the urban part of Lot low-lying even more likely to cause stagnant water, such as low-lying areas of the Oriole Village, the dawn of a Village, Century Avenue, Ningbo East Rail overpass, new Chi community, it is still in the water status .
If there is no reservoirs storing flood consequences would be disastrous
"Anemones" the winds of relying on rain, making Ningbo the reservoir water level has soared. Last night, the reporting of all large and medium-sized reservoirs is still mostly "rosy" --- 22 more than the flood limit water level in the 30 large and medium-sized reservoirs.
30 large and medium-sized reservoir storage has been increased from 826 million cubic meters at 8 o'clock on the 7th, to 1.102 billion cubic meters in 20:00 the night before. 36 hours, 30 large and medium-sized reservoirs increased to build between 276 million cubic meters.
Zhang Tuo of the original, these large and medium reservoirs greatly to play the role of storing flood if they flood washed downstream, the consequences could be disastrous. Reservoir operation, we grasp the peak shifting and scheduling, to seize the downstream river water level and tide of flood early lower favorable discharged opportunity, and the river range of peak shifting and discharging flood of 200 million cubic meters, effectively protect the safety of reservoirs, but also greatly reduced the peak flow peak downstream played a very good protective effect. "