. Chemical composition of rivers and lakes. Water -- Composition; Rivers; Lakes. CHEMICAL COMPOSITION OF RIVERS AND LAKES G5 100-f 10 EXPLANATION Discharge Conductance -v'V. t"\ s^\ ' > - V 1/ V OCT NOV DEC FEB Figtjke 2.—Relation of specific conductance to mean daily runoff of the Saline River near Russell, Kansas, during part of 1946 and 1947. After Durum (1953). Re- printed by permission of the American Geophysical Union. fluctuations of discharge on a daily basis, but daily measurements of specific conductivity are available for many rivers in the United States. An example is provi
. Chemical composition of rivers and lakes. Water -- Composition; Rivers; Lakes. CHEMICAL COMPOSITION OF RIVERS AND LAKES G5 100-f 10 EXPLANATION Discharge Conductance -v'V. t"\ s^\ ' > - V 1/ V OCT NOV DEC FEB Figtjke 2.—Relation of specific conductance to mean daily runoff of the Saline River near Russell, Kansas, during part of 1946 and 1947. After Durum (1953). Re- printed by permission of the American Geophysical Union. fluctuations of discharge on a daily basis, but daily measurements of specific conductivity are available for many rivers in the United States. An example is provided by the Saline River, Kans., in figure 2. In addition to these temporal variations in the chemistry of rivers, there are also spatial ones. It has been known for a long time that the content of dis- solved matter of river water tends to increase from source to mouth. This tendency is particularly marked in regions of interior drainage, but it is also present in rivers emptying into the sea. A further complication is introduced by heterogeneities in river water at any particular level in the drainage profile. When two rivers meet, or when large amounts of chemically different water are introduced into a river in some other way, for example, by a large spring or a sewage outflow, there may not be complete mixing for a long distance downstream, as Heide (1952) has shown. In any large river system the composition of the dissolved salts is different in the various head-water tributaries, but these local irregularities, which reflect variations in the nature of the rocks in the various parts of the drainage system, tend to cancel each other as one proceeds downstream, and there is a tendency for the composition of the water in the down- stream parts of rivers to resemble one another. This has led to the concept of a general or mean composition of river water (Rodhe, 1949) and to some speculation that ion-exchange reactions with the suspended load or Table 5.—Mayo River near Pr
Size: 1672px × 1494px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorgeologicalsurveyus, bookcentury1900, bookpublisherwash
