Laserfiche WebLink
<br /> <br />(A) <br />w <br />0) <br />ot <br /> <br />RAINFALL SIMULATION STUDY OF WATER, SEDIMENT, AND SALT YIELDS ON THREE SOIL- <br />LANDFORM UNITS ON MANCOS SHALE3 <br /> <br />Background <br /> <br />We used the BLM large-plot rainfall simulator in the summer of 1981 to quanti- <br />fy re1 ative yi e1 ds of water, sediment, and sa1 t from three soi 1-1 andform uni ts <br />common in the Mancos shale regions of east-central Utah. The rainfall simu- <br />lator study site was located near Woodside, Utah, approximately 16 km (10 mil <br />northwest of Green River Utah (Fig. 2). The site was the location of the <br />detailed soil-geomorphology study (Schafer, 1981) summarized earlier in this <br />report. <br /> <br />We located plots measuring 6.1 x 6.1 m (20 x 20 ft) on 1) a low-relief shale <br />pediment on a gray, crusted, fine, loamy shale-derived soil (soil A), and on <br />2) the same low-relief shale pediment on a light brown, cracked'2fine, loamy <br />aeQ1ian soil (soil D). A larger plot encompassing a small 185 m (2,000 <br />ftZ) microbasin was located on steep, dissected, raw shale badlands. All <br />plots had less than 20% vegetative cover, which is representative of the <br />region. Two simulated rainfall runs were made on each plot. Rainfall was <br />applied at about 5 cm/hr (2 in/hr) for 35-40 minutes (approximately a 10-year, <br />30-minute storm for the region). Rainfall intensities were lower on the <br />larger badland plot. Upland transects were used to quantify the relative <br />magnitudes of rill erosion, interri11 erosion, creep, and microchannel erosion <br />on the steep badland plot. <br /> <br />.. <br />~ <br /> <br />Salt Lake City <br />* <br /> <br />UTAH <br /> <br /> <br />Grand Junction <br /> <br /> <br />Figure 2. Location of Rainfall Simulation Study, Woodside, Utah. <br /> <br />3 Detailed study results provided in Jackson and Ju1ander (1982). <br /> <br />18 <br />