1玉仁电站工程基本概况 1.1水文基本资料 玉仁电站位于波密县玉仁河上。
玉仁河是雅鲁藏布江的一级支流,发源于喜马拉雅山北麓仲巴县境内, 海拔5685m,河长402km,流域呈长方形。
电站坝址以上流域面积5615.2km2,河道平均比降5%o。
流 域内地势由北向南倾斜,地形复杂,河道由高山经高原进入河谷,河谷断面由“V"型逐渐过渡到“U" 型。
设计代表年年内分配比例见表1-1。
表1-1设计代表年径流年内分配比例表 月月份123456789101112 频率 P=10%1.41.321.843.497.6718.020.014.713.99.894.562.98
69306 P=50%2.52.152.203.559.6520.420.613.810.27.204.612.96
07505 P=90%2.32.162.303.676.6213.018.616.715.710.25.133.25
537579 计算求得玉仁电站坝址处指定频率的设计代表年年径流量如下: 丰水年P=10%,K10%=1.26,Qp=62.82m3/s; 平水年P=50%,K50%=0.99,Qp=49.36m3/s; 枯水年P=90%,K90%=0.75,Qp=37.40m3/s。
表1-2设计代表年年内径流分配表单位:m3/s 月份1235689101112 频率 P=10%10.999.9713.9126.3257.82136.38150.98110.83105.2674.5334.3822.47 P=50%14.8012.7413.0121.0257.16121.26122.3181.7560.7442.6627.3217.55 P=90%10.569.6810.3016.4829.7158.4883.7875.1970.7846.1823.0514.60 表1-3玉仁电站丰水年逐日平均流量(P=10%)单位:m3/s 月三四五六七九++一十二 日 114.0710.3914.0120.4034.13109.60180.6678.11153.09117.5043.1328.11 213.7910.5314.0122.2339.78107.82191.1580.40142.34110.9041.6027.36 13.2310.2513.4122.2345.21111.08173.6771.38134.61105.5641.6026.37 412.249.9713.8123.1438.88120.00172.5888.44121.6597.3941.0924.62 511.129.7013.8122.8332.55105.44199.2396.32111.7298.0242.3624.13 610.559.2814.0123.4433.2392.37200.5497.14105.6598.0240.8325.37 710.699.5613.4125.8837.0787.62220.20132.2598.7592.0538.0223.13 811.409.4213.2126.1832.5583.46197.04146.2094.3489.2238.2823.13 911.969.1413.6125.8831.6584.65190.05142.7690.7587.3437.5124.13 1012.529.1413.8125.2735.2690.89279.62119.95107.5881.6836.2423.88 1111.129.8413.8124.6635.0487.32280.93132.25110.6176.9735.4724.87 1211.129.9714.0122.8340.9297.12273.94141.77109.5173.8335.2223.38 1311.129.8414.6122.5351.77101.28249.47142.7695.7270.6935.2222.39 1411.2610.2514.0123.1464.42109.60204.04150.6388.2769.1233.4322.63
1510.699.8414.0123.1458.77118.81170.17135.7082.2068.1733.9421.89 1610.559.9714.0124.0555.38146.73146.80116.5088.2769.7533.9421.64 1710.2710.1113.4124.0561.71155.04131.7397.1486.6266.2931.6421.64 1810.5510.6713.8124.0567.82207.62116.44100.5980.8262.8331.13...