Changes in hydro-geomorphological system in Asian monsoon area

对一些湖泊沉积物的分析表明，沉积物的物理性质是水湖环境的代表：1)日本中部约果湖的平均矿物颗粒大小大致指示年降雨量；2)粒度分布的粗含量表明日本中部北国地区的Takidani-Ike湖多雨年；3)沉积物的粒度、含水率和颗粒密度与贝加尔湖的全球气候变化密切相关(冰期和间冰期的物理性质)。湖泊沉积物的物理性质还反映了每个流域的水文地貌背景；在约果湖的沉积物中发现了盆地的一些人为变化。在贝加尔湖沉积物中发现了一些与冰筏有关的现象。

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.