The chemistry, mineralogy, and rates of transport of sediments in the ...
The chemistry, mineralogy, and rates of transport of sediments in the ...
The chemistry, mineralogy, and rates of transport of sediments in the ...
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11<br />
<strong>in</strong>creased sediment concentrations caused by terra<strong>in</strong> disturbance . However,<br />
it seems likely that variable fractions <strong>of</strong> <strong>the</strong> sediment added to <strong>the</strong><br />
stream by terra<strong>in</strong> disturbances would settle to <strong>the</strong> stream bed . This would<br />
especially affect Group 2 type streams <strong>in</strong> summer, fall, <strong>and</strong> w<strong>in</strong>ter periods<br />
<strong>of</strong> low velocity <strong>and</strong> Qi. Such added sediment may be dispersed to pool areas<br />
<strong>of</strong> <strong>the</strong> stream or <strong>transport</strong>ed out <strong>of</strong> <strong>the</strong> stream only dur<strong>in</strong>g periods <strong>of</strong> maximum<br />
velocity<br />
such as dur<strong>in</strong>g spr<strong>in</strong>g <strong>and</strong> summer floods . We have<br />
observed <strong>the</strong> .atream's Mean's fractionation <strong>of</strong> po<strong>in</strong>t-source sediment addition at<br />
Caribou Bar Creek (where a natural l<strong>and</strong>slide flowed <strong>in</strong>to <strong>the</strong> stream), at<br />
<strong>the</strong> Dempster Highway cross<strong>in</strong>g <strong>of</strong> <strong>the</strong> Rengleng River, <strong>and</strong> at <strong>the</strong> Mackenzie<br />
Highway cross<strong>in</strong>g <strong>of</strong> <strong>the</strong> Mart<strong>in</strong> River .(see Rosenberg <strong>and</strong> Snow, 1975) . In<br />
<strong>the</strong> case <strong>of</strong> <strong>the</strong> Caribou Bar <strong>and</strong> Rengleng examples, s<strong>and</strong>s <strong>and</strong> silts appeared<br />
to accumulate near <strong>the</strong> po<strong>in</strong>t <strong>of</strong> entry <strong>of</strong> <strong>the</strong> added sediment to <strong>the</strong> river<br />
channel, but f<strong>in</strong>er silts <strong>and</strong> clays were <strong>transport</strong>ed a short . distance (