To understand the river characteristics, the cause of formation and the possible measures to reform them is best way to achieve great success in river training.
Analyses and studies have been made on scouring and deposition in riverbed and accu-mulation of frazil ice under ice jam in Hequ Reach of the Huang He (Yellow River) during ice periods, based on prototype observation data of during periods.
The temperature of the water in the Changjiang River System (except the mouth region), as well as DO, pH, COD, total salts, hardness, chemical types, chemical stability, alkali capa-city and acid capacity are studied in this paper.
The profile averaged snow density in the high alpine area of Urumqi river basin is 140 kg/m3 in the period of the formation of deposit snow during early winter (Oct.), It grows to 190-21O kg/m3 in the early period of stable snow cover during the middle winter (Nov.-Feb.) and reduces to 175kg/m3 in the late period of stable snow cover during late winter and early spring (Mar.-Apr.).
On the administrative-economic map of China, Henan is situated in the central part bet-ween the east and west and the north and the south, and takes a key position in the regional development of China.
