Why does the Nile change color?Why does the Nile flood regularly?

We all know that the Nile is the longest river in the world. I'm afraid many people don't know that the Nile is actually a river that can change color. Over the course of the year, the waters of the Nile change from clear to green, then reddish-brown, and finally green.

Why is that?It turns out that there were two rivers in the upper reaches of the Nile, the White Nile and the Blue Nile. The Nile River is dry from February to May, when the water is crystal clear.

At the beginning of June, the upper reaches of the White Nile will be mixed with a lot of plankton, floating grass, etc., so you will look like the Nile is turning green. And in July, the Nile enters a flood period. The water increased so much that the river was mixed with a lot of sediment, so the water turned reddish-brown.

September is the most flooded month, when the Nile is at its redtest. By November, the water level of the Nile will begin to drop. The reddish-brown color slowly faded and then became clear and transparent again.

Because of the change in the color of the Nile River, it also provides a message for residents on both sides of the river to sow seeds and prevent floods. The Nile River is used to determine the change of seasons and the time of sowing. <>

The Nile, which originates in central Africa, is a river that changes color. The Nile is the largest river in Africa and the second longest river in the world. It has a long history.

Ancient civilizations such as Sudan and Egypt flow through North Africa and flow north into the Mediterranean Sea. The Nile is 6,740 kilometers long, passing through numerous lakes along the way, forming six large waterfalls. The flooding of the Nile occurs every summer, when the river brings a large amount of minerals and organic matter from the upstream, forming a thick layer of silt.

The Nile delta region is known as the "land of abundance" because crops can be harvested three times a year. The Egyptians looked forward to the high water level of the Nile every year, paying special attention to the change in the color of the river, because it was possible to understand the movement of the river and move away from the flood or sow grain for farming. Over the course of the year, the river turns from clear to green to reddish-brown before finally returning to its original appearance.

Why is that?The Nile River is known to be an important river in Africa and the birthplace of ancient civilizations. It has a long history, passing through ancient civilizations such as Sudan and Egypt, and flowing north into the Mediterranean Sea.

The upper reaches of the Nile River are divided into two ends, namely the White Nile and the Blue Nile, which merge with each other, and when the river flows through Cairo in Egypt, it forms a huge delta of 10,000 square kilometers, with abundant products on both banks. Every year from February to May, it is the dry season of the Nile, and the river water is clear and transparent. Beginning in June, the White Nile River upstream is mixed with floating reeds and grasses, so that the water turns green.

In July, when the Nile entered the flood season, the Blue Nile, which accounts for four-sevenths of its flow, increased in volume and was reddish-brown with a large amount of sediment, with the reddish water in September. By November, the water level has dropped, the reddish-brown color has faded, and the Nile has returned to its time of crystal clearness. The lives and farming of the inhabitants on both sides of the river have a lot to do with the discoloration of the Nile.

When residents see the change in the color of the water, they immediately know the movement of the river, and move it up in time to avoid floods or sow grain for farming. The discoloration of the Nile River turns the land on both sides of the river into a treasure land of abundant harvest every year. <>

Why does the Nile, which flows through Egypt, change color? Originally, the upper reaches of the Nile River were divided into two sections, namely the White Nile and the Blue Nile, and when the two rivers converged and flowed through Cairo, the capital of Egypt, they formed a huge delta of 10,000 square kilometers, which was the "harvest treasure" of the Egyptians. From February to May every year, the Nile River enters the dry season, and the river water is clear and transparent.

From June, the White Nile flows through the delta with floating reeds and grass, and the water turns green. After July, the Nile River enters the flooding period, and the water volume of the Blue Nile increases dramatically, and the large amount of sediment brought from the flow area makes the Nile reddish-brown, and the river reaches its reddest in September. By November, the water level of the Nile had dropped, the reddish-brown color had gradually disappeared, and the Nile had returned to its original form of crystal clearness.

The Nile River is the largest river in Africa. Although it flows downstream through arid deserts, a "green corridor" has emerged on both sides of it. Because it has abundant water all year round, especially in summer and autumn every year, it will flood regularly, which not only brings sufficient water, but also brings a lot of sediment and humus to both banks, which is very conducive to the growth and irrigation of crops.

One has to ask: why does the Nile flood regularly? It turns out that the Nile has two headwaters:

One is the White Nile, which is fed by the Kagra River, which originates among the mountains near the equator. With rain all year round and numerous lakes in between, the Nile flows all year round. The other headwater, the Blue Nile, originates in Lake Tana on the Ethiopian plateau, where summer and autumn rainfall is abundant, accounting for more than 75% of the annual precipitation, and winter and spring are dry.

As a result, the water of the Nile floods the lower reaches of the Nile once a year in summer and autumn.

First of all, you need to understand some of the basic conditions for river flooding: Natural conditions:1The climatic zone through which the river flows (the amount of precipitation, seasonal and interannual variations in precipitation, and the concentration of precipitation).

2.The hydrological state of the river (tributaries of the river, vegetation cover - sediment content, etc.) of the river flow

Human conditions: 1: whether the flood control facilities of the river are perfect (whether there is a flood control dam, whether the river is regularly reinforced, etc.), 2. Whether the local people are indiscriminately cultivated and logged. Wait.

The question can be answered from the following aspects: Natural causes: 1. The flooding of the Nile is mainly caused by the Blue Nile River originating in the Ethiopian Plateau, and the main flow area of the Blue Nile River is the savannah climate zone, with large precipitation and mainly concentrated in summer, so that the flow of the river is relatively large, and it is easy to flood during the wet season.

2: In summer, the blue Nile and the white Nile come at the same time, which increases the flow of the river, 3: the sediment content in the middle and lower reaches of the Nile is relatively large, and the sediment accumulation blocks the river, and the river is not smooth.

Human reasons: 1. The flood control measures in the middle and lower reaches of the Nile are relatively poor, and the Aswan Dam is in disrepair and cannot withstand the violent floods. 2. People along the coast reclaim the grassland, which makes the soil erosion more serious, increases the sediment content of the river, and easily blocks the river and makes the river flow poor.

The Blue Nile River flows through the savannah climate, which is divided into dry and wet seasons, and the wet season has a lot of precipitation, so it floods. For thousands of years, the Nile River has flooded regularly from June to October every year.

The Nile River originates in central Africa, flows through ancient civilizations such as Sudan and Egypt, and flows north into the Mediterranean Sea, making it the longest river in the world.

River. The Nilojon is another river that changes color, and over the course of the year, the water changes from clear to green to reddish-brown before finally returning to its basic color. Why is that?

The upper reaches of the Nile are divided into two ends, the White Nile and the Blue Nile, and the two rivers merge with each other, and when the water flows through Cairo, it forms a huge delta with abundant products on both sides. Every year from February to May, it is the dry season, and the river water is clear. Since June, the White Nile River has been flowing with floating reeds and grass, so that the water is green.

In July, the Nile River entered the flood period, and the Blue Nile, which accounts for 4 7 of the flow, increased in water at this time, and a lot of sediment made the Nile a reddish-brown color, and the river was the reddest in September. By November, the water level has dropped and the Nile is crystal clear again.

The life and cultivation of the people on both sides of the Nile have a lot to do with the discoloration of the Nile. When people saw the change in the color of the water, they immediately knew the movement of the river and quickly moved away from the flood or sowed grain for farming. The discoloration of the Nile River makes the land on both sides of the river a treasure land of abundance.