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    15 April 1958, Volume 24 Issue 2 Previous Issue    Next Issue
    ON THE STABILITY CRITERION OF ALLUVIAL STREAMS
    CHIEN NING
    1958, 24 (2):  128-144.  doi: 10.11821/xb195802003
    Abstract ( )   PDF (1149KB) ( )   Save
    The analysis of this paper may be summarized as follows: 1. Streams, as an integrated part of a drainage basin, assume their characteristics in accordance with the hydrographic and geologic conditions of the basin. Giving the material which forms the boundary of the channel, the form and gradient of an alluvial river are functions of the amount and hydrograph of water and sediment carried to the reach from the upstream watershed. 2. When the capacity of the stream channel to carry the bed-material load is different from the amount of the load brought in by the watershed, erosion and depo- sition result. After self-adjustments of long duration, many of the alluvial rivers are able to carry the water and sediment imposed on them by the basin, and approach a condition of equilibrium or quasi-equilibrium. The sediment carrying capacity of these rivers actually represents the timed average of the sediment production rate of the upstream basin.
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    A PHYTO-GEOGRAPHICAL SURVEY OF NORTHWEST SZECHUAN AND REGIONS OF CHANG-TU DISTRICT
    Tsui You-Wen
    1958, 24 (2):  174-188.  doi: 10.11821/xb195802006
    Abstract ( )   PDF (2704KB) ( )   Save
    The author gives biefly in his report of the materials collected in a phyto-geographical surrey of the Scientific Expedition in Tibet which was organized in 1951 under the auspices of the Central Committee of Culture and Education.
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