Question

Почему в речке на глубене вода холоднее чем вверху

Answer 1

Теплая вода всегда будет на поверхности,а холодная на глубине(вода при нагревании расширяется-становится легче)
источник:физика 7 класс

Answer 2

Why is the water colder at the bottom of the river than at the top?

The temperature of water in a river can vary depending on various factors, including depth, sunlight exposure, and water flow. In general, the water at the bottom of a river tends to be colder than the water at the top. This phenomenon can be explained by a few key factors:

1. Thermal Stratification: Rivers often exhibit a phenomenon called thermal stratification, where the water column is divided into distinct layers with different temperatures. The colder water tends to sink to the bottom, while the warmer water stays at the top. This is due to differences in density caused by temperature variations.

2. Sunlight Exposure: Sunlight plays a significant role in heating the water in rivers. When sunlight penetrates the water, it warms the surface layers more than the deeper layers. As a result, the top layers of the river tend to be warmer than the bottom layers, which receive less direct sunlight.

3. Water Flow: The flow of water in a river can also contribute to temperature variations. As water moves downstream, it can mix and exchange heat with the surrounding environment. This mixing process can lead to a more uniform temperature distribution throughout the water column. However, in slower-moving or stagnant areas of the river, the temperature stratification may be more pronounced.

It's important to note that these factors can vary depending on the specific characteristics of the river, such as its depth, width, and surrounding environment. Additionally, seasonal changes and weather conditions can also influence the temperature distribution in a river.

Conclusion

In summary, the water at the bottom of a river is typically colder than the water at the top due to thermal stratification, sunlight exposure, and water flow. These factors contribute to temperature variations within the water column.