TY - JOUR JF - JSTNAR JO - jwss VL - 12 IS - 46 PY - 2009 Y1 - 2009/1/01 TI - Evaluation of Error in Area-Increment and Area-Reduction Methods to Predict Sediment Distribution of Dez, Dorudzan and Shahid Abbaspour Reservoirs TT - ارزیابی خطای روش‌های افزایش سطح و کاهش سطح در پیش‌بینی نحوه توزیع رسوب در مخازن سدهای دز، درودزن و شهید عباسپور N2 - After construction of a dam across a river, sediments settle behind the dam. It is important for dam designers to estimate the rate and distribution of sediments in the reservoir. In this study, the accuracy of area-increment and area-reduction empirical methods to predict the sediment distribution of Dez, Dorudzan and Shahid Abbaspour reservoirs is evaluated. The last measurement of sediment in these reservoirs was in 2003 (Dez), 2005 (Dorudzan) and 2005 (Shahid Abbaspour). The comparison between actual sediment distribution and predicted sediment distribution by using area-increment and area-reduction methods showed the maximum error at the depth of sediment behind the dam. At higher elevations, the error decreased and reached zero when the elevation was maximum. For Dorudzan reservoir, which has the least sediment volume (31 Mm3), the area-reduction method is less accurate, as compared to the area-increment method (81% vs. 37.5%). For Dez and Shahid Abbaspour reservoirs, where their sediment volume is high (608 and 737 Mm3, respectively), the error of the two methods is relatively equal (in Dez, 29% for both methods, and in Shahid Abbaspour, 22% for area-reduction and 25% for area-increment methods). After long-time sedimentation, the shape factor decreased and reservoir type of all three reservoirs changed to 2. SP - 553 EP - 564 AU - Mousavi, S.F AU - Mohammadzadeh Habili, J AU - Heidarpour, M AD - KW - Sediment distribution KW - Storage capacity KW - Erosion KW - Reservoir UR - http://jstnar.iut.ac.ir/article-1-1142-en.html ER -