How Yuncheng Salt Lake was formed Salt Lake was the sea in ancient times. The famous salt lake in Qaidam Basin of China was a Wang Yang sea as early as 230 million years ago. Later, the earth's crust rose and the seawater retreated, resulting in an inland basin with no edge and developed into a salt lake.
Some salt lakes evolved from freshwater lakes. The uplift height of sandbars on the edge of lake basin is different in different periods. When the sandbar is below sea level, the lake basin is in a semi-closed state and seawater flows in. When the sandbar exceeds the sea level, the lake basin closes. The climate is dry and hot for a long time, and the lake water is strongly evaporated and concentrated, and it also becomes brine, and the salt is gradually deposited.
The formation of salt lakes requires certain natural conditions, the most important of which are the following two points:
(1) Arid or semi-arid climate. In arid or semi-arid climate conditions, the evaporation of lakes often exceeds the recharge of lakes, and the lake water is constantly concentrated and the salt content is constantly increasing, which makes various elements in the water saturated or supersaturated, and forms various sediments with different salt contents on the lakeside and lake bottom. For example, the Qaidam Basin, with an altitude of 2,600-3,200 meters, is a typical inland desert basin with deep inland and continuous mountains. It is affected by the westerly circulation in the middle latitude all the year round, with few water vapor transport and precipitation and dry air. The annual precipitation of Chaka Salt Lake in the northeast edge of the basin is about 265,438+00 mm, while the annual precipitation of Chaerhan Salt Lake in the center of the basin is only about 30 mm ... The evaporation here is much greater than the precipitation, and such climatic conditions are obviously very conducive to the formation of salt lakes, so there are many salt lakes distributed in the basin. If the climate is extremely dry, there is no rain all the year round, or the precipitation is scarce, it is not conducive to the formation of salt lakes. For example, Taklimakan Desert and Gurbantunggut Desert in Xinjiang have long sand dunes, no runoff on the surface and dispersed salt, so it is difficult to form salt lakes in these areas.
(2) Closed terrain and a certain supply of salt and water. The closed terrain makes the runoff in the basin converge into the lake, so that the lake will not leak out, and the salt will be continuously transported from the basin to the lake through runoff. Under the strong evaporation, the lake becomes more and more salty and the salt accumulates more and more. As time went on, a salt lake was formed.
In the salt lake area, you can often see a silvery white salt belt around the lake, just like a beautiful collar worn on the salt lake. This natural phenomenon is a strong evidence that salt substances migrate from the basin to the salt lake. As all kinds of salts dissolved in water migrate from the river basin to the salt lake, the water gradually evaporates and the concentration increases. Once it reaches saturation or supersaturation, precipitation will occur. However, due to the different solubility of various salts, there is a certain precipitation order. From the upstream of provenance to salt lake, all kinds of salt deposits have obvious zonal distribution law. For example, in some salt lake areas at the northern foot of Kunlun Mountain, the area near the mountain area is boron salt zone, and the area near the lake is mirabilite zone, and salt and carnallite are deposited in the lake.
Salt lakes can not only be formed on the mainland, but also evolved from bays. The average salt content of the vast ocean is 35 grams per liter of water. If the bay is isolated and closed from the ocean due to the gradual development and expansion of coastal sand bars, and the climate is dry and hot, the salinity of the water body will increase continuously under the strong evaporation, and eventually salt lakes will be formed, resulting in various salt deposits. This kind of salt lake evolved from the bay is called ocean salt lake. China modern salt lake belongs to continental salt lake.
What is the reason for the formation of Poyang Lake? According to the research of Mr. Zhu Kezhen, a meteorologist, geographer and educator, the climate in China became warmer from the Sui, Tang and Five Dynasties to the Northern Song Dynasty. At this time, the lakes in the middle and lower reaches of the Yangtze River developed significantly, expanding the area of Poyang Lake between the middle and lower reaches of the Yangtze River, and the lakes expanded rapidly after Sui and Tang Dynasties. During the hot and rainy Sui, Tang and Northern Song Dynasties, the runoff of the Yangtze River increased accordingly, especially during the flood season. Yunmengze in Jianghan Plain was once able to fully store floods, which basically disappeared in Sui and Tang Dynasties. Gu Ze, Peng Li, north of the Yangtze River, has long been replaced by a vicious pool. As a result, the flood storage capacity of the Yangtze River basin decreased significantly, the runoff of the main stream of the Yangtze River increased sharply, and the water level rose. Except for some flood diversion tunnels, most of them poured eastward. It caused two kinds of results in the hukou area: first, the flood diverted and flooded into Peng; The second is to support Peng's beating. The combination of these two results is also an important factor leading to Peng's expansion. Therefore, from the late Tang Dynasty and the Five Dynasties to the early Northern Song Dynasty, Peng expanded across Yingzikou to the southeast Xiaoyang Plain at an unprecedented speed, which basically laid the scope and shape of Poyang Lake today.
What is the reason for the formation of Qinghai Lake? At 1, the structural fault of Qinghai Lake depressed the lake, and the edge of the lake basin was mostly connected with the surrounding mountains by faults. The lake was formed 2 million to 2 million years ago.
2. Due to the blockage of the leakage passage, Qinghai Lake has evolved into a closed lake. Coupled with the dry climate, Qinghai Lake has gradually changed from a freshwater lake to a saltwater lake.
Qinghai Lake
1, Qinghai Lake, also known as "Cuowumbu", which means "blue sea" in Tibetan, is located in the Qinghai Lake Basin in the northwest of Qinghai Province. It is not only the largest inland lake in China, but also the largest saltwater lake in China. It is formed by the fault subsidence between Datong Mountain, Sun Moon Mountain and Nanshan Mountain in Qinghai.
2. Qinghai Lake is located in the plateau, and the average daily temperature in July and August is only about 15 degrees. At this time, it is the most beautiful time in Qinghai Lake. Thousands of acres of rape flowers around the lake are in full bloom, and golden yellow is scattered around the blue sky. Wild flowers in alpine pastures are colorful and silky, and countless cattle and sheep are fat and strong.
3. 2065438+On July 30th, 2002, the latest remote sensing monitoring results of Qinghai Institute of Meteorological Science showed that the area of Qinghai Lake continued to increase for 8 years.
Yuncheng Salt Lake is rich in salt? Yuncheng Salt Lake, located in the south of Yuncheng City in the southwest of Shanxi Province and at the northern foot of Zhongtiao Mountain, is the largest lake in Shanxi Province. In ancient times, this place was the land of Xie Xian and Hezhou, so it was also called Xiechi and Hedong Salt Pond. Yuncheng Salt Lake is famous for its salt production since ancient times. The salt produced is called "Xie Yan", "Lu salt" or "Hedong salt". Yuncheng Salt Lake is an ancient and typical inland saltwater lake. Geological research shows that Yuncheng Salt Lake was born in Cenozoic Himalayan tectonic movement, about 50 million years ago. Extending from northeast to southwest, it is about 30 kilometers long, 3 to 5 kilometers wide, 324.5 meters above sea level, and the deepest part is about 6 meters, with a total area of 132 square kilometers.
Yuncheng Salt Lake is comparable to the world-famous Dead Sea in Israel. The black mud in the lake contains seven kinds of constants and sixteen kinds of trace elements. People can row boats in the lake, and the black mud in the lake can beautify the skin, so Yuncheng Salt Lake is called the sea of death.
Yuncheng Salt Lake is the third largest inland lake of sodium sulfate type in the world, with an area of 65,438 0.32 square kilometers and a development history of more than 4,000 years. Salt Lake is bounded by Zhongtiaoshan in the south, Mingtiaogang in Emei in the north, Yaotai in Sushui in the east and the old capital of the Yellow River in the west. The lake is covered with silver, vast and boundless, surrounded by reed wetlands, and waterfowl and migratory birds gather.
Yuncheng Salt Lake has been rich in "Luyan" for more than 4,000 years, and many cultural landscapes have been derived around it. Yanchi Temple built in the Tang Dynasty, the revered Guan Gong Jia Fu, Guandi Temple, the largest martial temple in China, Sima Wengong Temple, Yongle Palace murals, Pujiu Temple, Yellow River Tieniu and the ruins of the ancient capital of Zhou Pu are all dotted around the salt lake like pearls.
Since ancient times, Yuncheng Salt Lake has been famous for its rich "Lu salt". According to research, the development history of "Luyan" can be traced back to a beach of snow thousands of miles ago.
More than 4000 years ago. In ancient times, when Shun Di visited Yuncheng Salt Lake, he couldn't help singing "Song of the South Wind": "The south wind can solve the worries of our people; The south wind can enrich the people, which highly summarizes the unique social and economic value of Yuncheng Salt Lake. To some extent, the development of "Lu Yan" has made great contributions to the end of the era of cannibalism and blood consumption for the Chinese nation and the birth of Chinese civilization. After nearly 3000 years of development, "Luyan" has been exposed to the sun in the early stage of development and has become a natural jade. By the Tang Dynasty, a complete "ploughing and pouring" salt shovel method had been formed, which was an epoch-making symbol of the production of "Lu salt" in Yuncheng Salt Pond. The farming and watering methods in the Tang Dynasty were nearly 1000 years earlier than those in Europe, which reflected that the productivity development level of China in the Tang Dynasty was in a leading position in the world. In 1980s, on the basis of fully studying Yuncheng Salt Lake resources, relevant departments began to focus on the development and utilization of sodium sulfate series, and the production of "Luyan" basically stopped. However, as an advanced production technology that has been passed down for thousands of years, the salt shovel method of "cultivating soil and watering" is still widely used in sea salt production. Yuncheng Salt Lake is located in the hinterland of Jinnan Basin, at the intersection of Qin, Jin and Henan Yellow Rivers, surrounded by Zhongtiao Mountain and the Yellow River. It is not only unique in scenery, but also rich in cultural background and humanistic landscape. Yuncheng is Guan Yu's hometown, where Guandi Temple, the largest martial arts temple in China, is located. In addition, there are Sima Wengong Temple, Yongle Palace mural, Pujiu Temple, Yellow River Tieniu, Zhou Pu ancient capital ruins, etc., which are dotted around the salt lake like pearls. Yuncheng Salt Lake complements the surrounding historical sites and the scenery of the Yellow River. Yuncheng Salt Lake is rich in tourism resources and has great development potential. I believe that in the near future, a world-class saltwater floating, black mud bathing center and "Luyan" cultural tourism center will be built here.
Yuncheng Salt Lake [Sea of Death] The body of the sea of death:
During the summer vacation, I went to many places to play, such as Jiulonggou, Lianghekou, Pingle Ancient Town, etc., but what impressed me the most was the Dead Sea and the Sea of Death in Daying County.
It's interesting to see the sea of death in the newspaper a long time ago. You can lie on the water and float! So I look forward to visiting the sea of death one day. Unexpectedly, my luck is very good. I went to the sea of death with my parents this summer vacation. The sea of death is divided into indoor activity rooms and outdoor floating fields. We first bought three air cushions as pillows to float and rest on the outdoor floating field. Don't say it feels good to float on water! The sun shines on me so comfortably that it is 1000 times more comfortable than sleeping in a soft bed! It is said that soaking here for more than 20 minutes can also treat colds and some skin diseases with small pimples on the face!
After floating on the water, we came to the indoor activity room. We won't know how big it is until we get in. As soon as we went in, I was shocked. "How big!" I couldn't help but let out a cry. It was almost the size of a football field. It went directly to the "high-altitude slide", which was fun! I quickly slid down the current, as fast as the wind and as straight as an arrow. At that time, I thought to myself: What if this slide suddenly breaks down? I'm a little scared anyway. After the slide, I went to the indoor brackish water lake. Just then, waves of "tsunami" descended like a fierce beast, which made me choke a few mouthfuls, but it was * * *! Then, I went to "Children's Paradise" and "Rush Forward". In the afternoon, because of time, we had to leave the sea of death reluctantly.
The Dead Sea is an exciting ocean, a place where people don't want to go home. I will definitely remember you-the sea of death.
What are the reasons for the formation of a city? The main factors affecting the formation of a city are: socio-economic conditions and natural conditions.
Social conditions:
1. The influence of social development on urban formation
2. The influence of political factors on the formation of cities Some political events have a great influence on the formation and development of some cities, and even have a decisive influence on some cities.
3. The influence of traffic conditions on urban formation. Transportation is an important means of regional contact and material exchange. All important cities are transportation hubs, which are connected with the hinterland through the transportation network.
4. Cultural factors affect the formation of cities, and human cultural activities can often promote the formation and development of cities.
Natural conditions:
1. Geological conditions and urban formation geological conditions are the solid foundation for urban construction and development. Rocks are not convenient for urban construction, and sand, gravel and clay layers formed by weathering of rocks are convenient for human activities and urban development.
2. Topographically, the plain is most suitable for the formation and development of cities. Flat terrain is conducive to the expansion of cities, the development of various means of transportation and the development of agriculture. Therefore, most important cities in the world are located in plain areas, such as Shanghai, Beijing, Guangzhou and Hankou. In China, the world's big cities, such as new york, London, Berlin, Paris, Tokyo, Chicago, Moscow, Kolkata and so on.
3. Climate and urban formation From a global perspective, most cities, especially big cities, are located in temperate regions suitable for human life. Climatic conditions often affect the nature of cities. Osaka, Japan and Lancashire, England became famous textile industrial cities in the early days of the world, which had a certain relationship with local climatic conditions (warm, rainy, high air humidity, etc.). ).
4. Water is closely related to the formation and development of cities. Riverside, lakeside and coastal zone are all favorable areas for urban formation. Rivers have always been an important transportation channel and the best source of industrial water and drinking water, providing important favorable conditions for the formation and development of cities.
5. After the mineral and urban industrial revolution, some large mineral areas developed rapidly into newly-built industrial cities.
The formation of early cities is basically a supplement to natural conditions: the atmospheric inverse radiation is strengthened, so that the ground temperature will not drop too much. The answer is a.