中文摘要：

通过河流输沙量计算出三峡地区短周期的剥蚀速率为0.084mm/a,将剥蚀速率、下切速率以及隆升速率对比研究,确定了长江流域三峡段极短周期内下切速率与地表隆升速率之间的线性关系,并得出侵蚀基准面及气候变化的约束系数大约是0.4。基于前人对三峡地区一级阶地的数据,计算出一级阶地的下切速率约为3.025mm/a。现代地壳变形测量和GPS测量结果,发现黄陵穹隆现今地表相对于周边地区其地表隆升速率最大可达5～10mm/a。取其平均值7.5mm/a作为三峡地区极短周期的地表隆升速率,对比分析三峡地区剥蚀速率、下切速率与隆升速率,结果该区隆升速率大于剥蚀速率,大约是剥蚀速率的89倍;下切速率也大于剥蚀速率,大约是剥蚀速率的36倍;隆升速率同样大于下切速率,大约是下切速率的2.5倍。三峡地区隆升大于剥蚀,也大于下切速率,三峡地区地表仍然在不断地升高;而地表剥蚀速率小于下切速率,地表切割进一步加深,因此地貌出现高低起伏、山高谷深的形态,并有进一步加剧的趋势。

英文摘要：

This paper calculates the denudation rate of the Three Gorges of the Yangtze River.It is 0.084mm/a in short-period.The paper compares and analyses the denudation rate,erosion rate and uplift rate,and finds the linear relationship between the erosion rate and the uplift rate,and that the constraint factor of the base level of erosion and climatic change is approximately 0.4.Based on the data of the first terrace,the calculated erosion rate of the first terrace is about 3.025mm/a.Modern crustal deformation measurements and GPS measurements find that the largest surface uplift rate is up to 5～10mm/a in the Huangling dome hill.The authors take the average 7.5mm/a as the surface uplift rate of the Three Gorges region in short-period.The comparison and analysis of the erosion rate,the erosion rate and uplift rate for the Three Gorges area find that the uplift rate is about 89 times greater than the erosion rate.The incision rate is also about 36times greater than the denudation rate,and the uplift rate is about 2.5times greater than the incision rate.The uplift rate is not only greater than the denudation rate in The Three Gorges region,but also larger than the incision rate,indicating the surface of the Three Gorges region is constantly increasing,while the denudation rate is less than the incision rate,and the surface cutting will further deepen,so the landscape of high mountains and deep valleys will further strengthen.