2006-11-03 16:28:00 

    

The Yellow River is the second longest river in China, and it is the vital water source of north and northwest of China. Originating from the northern foot of the Bayankela Mountain in Qinghai Province, it runs through 9 provinces and autonomous regions and flows into the Bohai Sea in Shandong Province. It is 5,464 km long with a basin area of 752,000 km2. The annual mean runoff volume in years is about 58 billion m3. The precipitation situation of Yellow River: Most of precipitation in YR basin is in form of rain .The precipitation in snow is a very small part of the whole .The multi-year average precipitation is 370.1 billion m3, only 6 percent of that of the whole country. The multi-year average precipitation in depth is 465mm.Generally the precipitation is decreasing gradually from Southeast to Northwest. The largest precipitation occurs in the north slope of the Qinling Mountain. The multi-year average precipitation can be up to over 900mm in some area, and the least precipitation occurs in Hetao area of Ningxia and Inner Mongolia with only 200~300mm. Timely distribution is uneven with a year. Most of precipitation occurs in the summer (June-August), over half of the whole year. The temperature situation of YR: The temperature in Southeast is higher than that of the Northwest. The highest average lunar temperature is often in July, in most area, it¡¯s between 20oC~29oC. The highest temperature is even high to over 40 oC in some area. The lowest temperature is often in January, in most areas it¡¯s below 0 oC. The Water resources of YR: Although it is the second longest river in china, it's not rich in water resources. The multi-year average natural runoff is 58 billion m3, only about 2.1% of that of the whole China. The average runoff depth is about 70 mm, less 30% of that of the whole China. Average water quantity per person is only 593m3, about 23% of the whole country. In the recent decades, due to climate change and activities of human being, drying up, severe water pollution, environment degradation etc. are arousing more and more attention from both China and Foreign Countries. YRCC is focusing on strengthening relevant research to obtain the appropriate solutions under the background of ¡° 3 Yellow River Construction¡±