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- W2355360879 abstract ":The method of measuring the density of rivers and lakes on topographic maps isdiscussed in this paper. By the practice of measuring, the authors provide, herewith, thedirection and some methods for investigative, and regard the work on quantitatively com-parison and investigation of differences of the distribution of regional waterbodies asuseful references to national economic construction.Indexes used for showing the density of the network of river systems are generallyas follows:1. The number of rivers in a unit area.2. The lengths of rivers in a unit area.3. The area occuppied by the rivers in a unit length.4. By composing a series of squares and rectangular netblocks, eath being equalin area, with the total lengths of rivers for a region as their sides, thus taking the lengthof the sides or the area of each block as the density index.5. The number of land blocks dissected by river-nets in a unit area.Indexes for representing the density of lakes are:1) The number of lakes in a unit area.2) The ratio of the area occuppied by lakes to the total area.3) The area occuppied by each lake.As to the concrete measuring works, the following notions are given:1. Waterbodies of special large size should be listed separately.2. The measuring area for calculating density index could be classified accordingto the width of rivers and the size of lakes in order to obtain the area of waterbodies.An index of different bearing will be yielded for density measuring if waterbody areasare excluded from the measuring area.3. In order to reveal fully the distribution character of drainage networks in dif-ferent regions, one should find out not only the numerical differences of rivers and lakes,but also the ratio of the area of waterbodies to the total area of the region.4. Since the rivers and lakes are usually mixed up, one should be able to findout some combined index.In addition to the large amount of measuring and calculating work, one should de-limit beforehand the density area of the region and decide whether the measuring is tobe carried out for the whole region or only for the example area. Detailed regulationsfor measurement index cards and tables should be laid down after the careful study andexperimental work.The compiling of the density map based on the measuring results will be the finalwork." @default.
- W2355360879 created "2016-06-24" @default.
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- W2355360879 date "1964-01-01" @default.
- W2355360879 modified "2023-09-25" @default.
- W2355360879 title "THE METHOD OF MEASURING THE DENSITY OF RIVERSAND LAKES ON TOPOGRAPHIC MAPS" @default.
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