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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‰。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频率123456789101112P=10%1.461.321.843.497.6718.0920.0314.7013.969.894.562.98P=50%2.502.152.203.559.6520.4720.6513.8010.257.204.612.96P=90%2.352.162.303.676.6213.0318.6716.7515.7710.295.133.25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=62.82 m3/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 月份频率123456789101112P=10%10.999.9713.9126.3257.82136.38 150.98 110.83 105.26 74.5334.3822.47P=50%14.8012.7413.0121.0257.16121.26 122.31 81.7560.7442.6627.3217.55P=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 月日一二三四五六七八九十十一十二114.0710.3914.0120.4034.13109.60 180.66 78.11153.09 117.50 43.1328.11213.7910.5314.0122.2339.78107.82 191.15 80.40142.34 110.90 41.6027.36313.2310.2513.4122.2345.21111.08 173.67 71.38134.61 105.56 41.6026.37412.249.9713.8123.1438.88120.00 172.58 88.44121.65 97.3941.0924.62511.129.7013.8122.8332.55105.44 199.23 96.32111.72 98.0242.3624.13610.559.2814.0123.4433.2392.37200.54 97.14105.65 98.0240.8325.37710.699.5613.4125.8837.0787.62220.20 132.25 98.7592.0538.0223.13811.409.4213.2126.1832.5583.46197.04 146.20 94.3489.2238.2823.13911.969.1413.6125.8831.6584.65190.05 142.76 90.7587.3437.5124.131012.529.1413.8125.2735.2690.89279.62 119.95 107.58 81.6836.2423.881111.129.8413.8124.6635.0487.32280.93 132.25 110.61 76.9735.4724.871211.129.9714.0122.8340.9297.12273.94 141.77 109.51 73.8335.2223.381311.129.8414.6122.5351.77101.28 249.47 142.76 95.7270.6935.2222.391411.2610.2514.0123.1464.42109.60 204.04 150.63 88.2769.1233.4322.631510.699.8414.0123.1458.77118.81 170.17 135.70 82.2068.1733.9421.891610.559.9714.0124.0555.38146.73 146.80 116.50 88.2769.7533.9421.6411710.2710.1113.4124.0561.71155.04 131.73 97.1486.6266.2931.6421.641810.5510.6713.8124.0567.82207.62 116.44 100.59 80.8262.8331.1320.891910.5510.8114.4124.9766.23204.35 103.98 121.75 89.9362.2131.9020.892010.4110.5315.0124.0566.46186.82 96.99116.50 91.8662.2132.1521.392110.1310.6714.8123.7565.55212.37 91.09114.70 83.5861.8931.6421.39229.999.8414.4124.6673.01188.61 88.91104.20 86.3460.6331.1321.64239.999.7015.2124.3684.77166.33 83.8994.5198.7560.9530.3722.14249.719.8414.8123.7579.80145.54 79.3090.08103.44 60.3229.8620.642510.279.8414.4124.9761.49128.61 76.0293.69114.48 59.0629.6020.15269.719.9713.6131.0667.59121.78 72.0995.34121.10 59.3828.5820.89279.8510.1113.8137.1480.25118.51 71.2295.34122.48 60.3227.8220.402810.139.9712.6141.4188.16180.59 70.12114.70 119.17 60.3230.3720.152910.4113.2141.1086.35193.36 80.17120.77 113.92 56.8629.0919.153010.6913.0142.3286.80228.11 88.47106.82 110.34 57.1828.3319.403110.5513.0189.7499.8397.1453.7218.901.2 洪水1.2.1 洪水特性玉仁河洪水主要由暴雨形成，具有洪水历时短，过程尖瘦，涨落快的特点。1.2.2 ...
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