Changes in hydro-geomorphological system in Asian monsoon area

对部分湖泊沉积物的分析表明，沉积物的物理性质是水文湖沼环境的代用指标：1）日本中部与吾湖的平均矿物粒度大致反映了年降雨量，2）日本中部北陆地区泷谷池的粒度分布中的粗粒含量反映了暴雨年; 3）贝加尔湖的粒度、含水量和粒度密度与全球气候变化密切相关湖泊沉积物的物理性质也反映了各流域的水文地貌背景;在Yogo湖的沉积物中发现了盆地中的一些人为变化。在贝加尔湖沉积物中发现了一些与冰漂流有关的现象。

Analyses of some lake sediments show that the physical properties of the sediments are proxies of hydro-limnological environment : 1) average mineral grain size in Lake Yogo, central Japan, roughly indicates annual rainfall ; 2) coarse content in grain size distribution suggests heavy rainfall years in Pond Takidani-ike in Hokuriku district, central Japan ; 3) grain size, water content and grain density are closely related to global climatic changes in Lake Baikal (glacial periods and interglacial periods are shown in the physical properties).Physical properties of lake sediments also reflect hydro-geomorphological settings in each drainage basin ; some artificial transformations in the basin are found in the sediments from Lake Yogo. Some phenomena related to ice rafting are found in Lake Baikal sediments.