论文部分内容阅读
一、导言 近年来,有关土壤侵蚀和产沙量过程的研究巳取得了许多新的进展。由于人们增加了对世界上江河湖海水质下降的关心,促进了这方面的许多研究。在关心水质危害的同时,人们还对上游泥沙所引起的港湾河口疏浚和灌渠、排水沟、路沟涵洞及其他输水设施清淤等的花费更为关心。人们关心的还有人类活动造成的全球性土壤资源的降低。
I. INTRODUCTION In recent years, there have been many new advances in the research on the process of soil erosion and sediment yield. Many studies in this area have been promoted as a result of the increased interest in water quality in the world’s rivers, lakes and seas. Concerned about the water quality hazards, people are also more concerned about the dredging of dredging estuarine and irrigation ditches, drainage ditches, culverts of road ditches and other dredging of water conveyance facilities caused by upstream sediment. People are also concerned with the reduction of global soil resources caused by human activities.