The progress of studying concerning basin systematic river discharge and
sediment yield process variation according to the
inquiry of domestic and international relevant document is looked back, has commented that the relevant problem research present situation and existence of major
sediment source area emphatically in areas of middle reaches of Yellow River.River sediment yield is the reaction of various natural factors and human action factor comprehensive role in basin, wash with sedimentation of river course to change, is related closely. Now pay attention to the problem of relation between environment and economy development extensively on world, according to increase and decrease in sediment flux of river, to study the influence impact of both human activity and climate change of basin with a global denudation system. Tens of near year come, especially since 80 decade, Yellow River mainstream discharge and sediment yield load to occurred variation, which discharge of water and sediment yield load decrease apparently, the new condition of the river course of lower reaches occurs atrophy and break to flow. To know these new conditions, will administer to Yellow River, and water resource development use bring a series of new problem, water flow and sediment variation the partial content of study from small watershed shifted to big basin area. Concerning the soil erosion of the
Yellow river basin system, and river water flow and sediment yield course variation law study have gotten plentiful accomplishment, But in view of the complexity of natural condition and human active the unceasing intervention for natural environment, the knowledge of people still has a lot of blank spots, the problem needs that still have a lot of aspects are going deep into to discuss. The relevant problem that this paper has according to now, have pointed out in basin systematic water flow and sediment process variation law to study, in recent research direction with content.