In the flood season of the Yangtze River, "thirsty", tens of millions of acres of arable land encountered a rare high temperature drought | high temperature shock wave
Since the flood season this year, many provinces and cities along the Yangtze River Basin have continued to experience little rainfall, and the highest temperature has broken through historical extremes one after another, causing the water level of the Yangtze River to continue to decline. The drought-affected area of arable land in 6 provinces (municipalities directly under the Central Government) in Sichuan has reached 9.67 million mu, and 830,000 people have been affected by drought and water supply.
The mid-season weather report issued by the Central Meteorological Observatory on the 15th pointed out that in the next 10 days (August 15-24), Jianghuai, Jianghan, Jiangnan, Sichuan Basin and southern Shaanxi will experience less rainfall, and there will be continuous high temperature weather.
The Yangtze River withered during the flood season
The Yangtze River Beach in Wuhan during the flood season does not see the surging river, and the hydrophilic platform also exposes a large beach.
At 17:00 on the 15th, the water level recorded at the Hankou Station of the Yangtze River was only 17.22 meters, which was the lowest in the same period in history since the Wuhan section of the Yangtze River had hydrological records.
Wuhan Flood Control and Drought Relief Headquarters said that the water level of the Yangtze River continued to decline after the main flood season this year, and there was a rare phenomenon of "reverse dryness during the flood season". This is because the rainfall in the Yangtze River Basin was significantly less, the inflow of water from the upper reaches decreased, and the continuous high temperature led to evaporation volume increases.
Data show that since July 9, the precipitation in Wuhan City has been 11.7% lower than the same period of the previous year; in the first and mid-July, the water inflow from Hankou Station, the control station in the middle reaches of the Yangtze River, was 59.184 billion cubic meters, which was 18% less than the 30-year average.
Not only Wuhan, but along the Yangtze River, from Chongqing in the upper reaches, to Wuhan and Jiujiang in the middle reaches, and then to Nanjing in the lower reaches, the Yangtze River Basin, which should have entered the flood season during the Meiyu period, has changed from more to less precipitation. In late June It is 20% less, and more than 30% less in July, especially in the lower reaches of the Yangtze River and the Poyang Lake water system, which is about 50% less, which is the least in the same period in the past 10 years.
According to the "Report on Important Water and Rain in the Yangtze River Basin" issued by the Yangtze River Hydrological Information Forecast Center on the 15th, on the 15th, among the five stations in the three mouths of the Jingjiang River, the Ouchi (Kangsan) station has been running continuously since 18:00 on July 9. Cut off for 37 days.
A reporter from China Business News found that due to the continuous high temperature weather, 7 rivers in Chongqing stopped flowing and 1 reservoir dried up. Several main rivers have also been reported without flow.
At the same time, affected by the reduction of upstream water and the continuous high temperature and little rain, the water level of Qilishan Station at the exit of Dongting Lake dropped to below 24.50 meters, and Dongting Lake entered the dry season 4 months ahead of schedule.
As early as 2:00 on the 6th of this month, the water level of the representative station of Poyang Lake at Xingzi Station retreated to 11.99 meters, marking that Poyang Lake entered a dry season, 100 days earlier than the hydrological record in 1951.
So far, the two lakes in the Yangtze River Basin have entered a dry season.
In addition, the water level in the middle and lower reaches of the Yangtze River continued to recede and was significantly lower than the same period in history.
At 8:00 on the 15th, the water levels of the main control stations of the Yangtze River were 17.30 meters in Hankou, 6.84 meters in Datong, 2355 meters in Qilishan, and 10.37 meters in Hukou, which were 6.08 meters, 4.96 meters, 5.87 meters, and 6.37 meters lower than the same period in history.
Among them, the flow rate of Datong Station of the Yangtze River was 21,200 cubic meters per second, 52% lower than that of the same period of the previous year. The high tide level of Nanjing was 5.29 meters, which was 2.18 meters lower than the same period of the previous year. Hongze Lake, one of the main water sources in northern Jiangsu.
The weather forecast shows that the high temperature in the southern region will continue, and the temperature in the eastern Sichuan Basin, southern Shaanxi, northwestern and eastern Hubei, central and southeastern Anhui, southern Jiangsu, and central and northern Zhejiang is 40-43 °C, and the temperature in Beibei District of Chongqing is as high as 44.5 °C .
Many provinces in the Yangtze River Basin enter the drought-resistant mode during the flood season
Faced with the severe drought-resistance situation such as continuous fine, hot and high temperature, generally less rainfall, and a significant drop in incoming water, Sichuan, Chongqing, Hubei, Hunan, Jiangxi, Anhui and other provinces in the Yangtze River Basin have launched a four-level emergency response to drought.
The Ministry of Water Resources released news on the 11th that the drought situation in the Yangtze River Basin is developing rapidly. The 6 provinces and cities of Anhui, Jiangxi, Hubei, Hunan, Chongqing and Sichuan are affected by the drought with an area of 9.67 million mu, and 830,000 people have been affected by the drought.
Li Guoying, deputy commander-in-chief of the National Defense General and Minister of Water Resources, requested that water conservancy projects should be scientifically dispatched, and drought-relief plans and bottom-line measures should be implemented in various places to ensure the safety of drinking water for the masses, as well as the needs of large livestock and seasonal irrigation water for crops.
The First Financial Reporter learned from the Hubei Provincial Department of Agriculture that as of August 12, crops in Hubei Province had been affected by drought with an area of 4.158 million mu, 1.984 million mu of disaster, and 201,000 mu of crop failure.
The affected crops are mainly rice, corn, soybean and other food crops, accounting for 67.3% of the total affected area.
In order to alleviate the drought and meet the water demand for agricultural irrigation, the River-Jihan Project in Jingzhou City, Hubei Province is increasing water diversion efforts to protect the "Hubei Granary".
Currently, a total of 4,891 reservoirs in Hubei have opened gates to release water, and the daily supply of irrigation water is about 100 million cubic meters.
289 large and medium-sized irrigation areas have been irrigated, with a cumulative water supply of nearly 5.245 billion cubic meters and an irrigated farmland of about 37.3 million mu.
Xingshan County, Yichang City, Hubei Province, which has ranked first in the country's high temperature list for many days, plans to artificially increase rainfall.
According to local media reports, from 12:00 p.m. to night time from August 15th to 17th, Xingshan will continue to carry out artificial rainfall enhancement operations.
All parts of Anhui are also going all out to transfer water to fight drought and protect seedlings.
Tongcheng City, Anhui Province mobilized villages along the river to adopt the method of digging river infiltration to store water for irrigation.
According to the staff of the Fangang Town Water Conservancy Station in Tongcheng City, since the Trailer River is a sandy riverbed with very rich water quality, the villages along the river actively organize excavators, adopt the method of scouring the river, and carry out self-rescue production to ensure 7,000 mu of fertile land (irrigation). .
The continuous high temperature in Sichuan caused drinking water difficulties in some villages and towns. Fire rescue teams from all over Sichuan delivered water to people's doorsteps, pig farms and fields to solve the people's urgent need for water.
From August 8th to 11th, Luzhou Fire Protection received a total of 42 drought-fighting water supply alarms, and a total of more than 240 fire rescue personnel were dispatched, and a total of more than 400 tons of water was delivered.
The Jiangsu Provincial Department of Water Resources has launched three major water diversion systems, namely, the north-to-north diversion of the river, the diversion of the river to the east, and the diversion of the river to the Taizhou region, to divert the river to supplement the regional water volume.
In response to the low water level in the Qinhuai River Basin, in addition to supernormal dispatching to preserve water and store water, emergency installations have been set up to supply rivers and lakes. Drought-resistant overturning water line has been activated, and the reservoir is replenished through the water-lifting station.
The Ministry of Finance, together with the Ministry of Water Resources, has recently studied carefully, and timely dispatched the area of arable land affected by drought and the number of large livestock that have temporary difficulties in drinking water due to drought. 200 million yuan of water conservancy and disaster relief funds in 8 provinces and autonomous regions will be provided to subsidize water conservancy and drought-relief water transfer in disaster-stricken areas, and construction of drought-relief water sources needed for disaster relief.