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Reservoir Sedimentation Study for the Bunakha Hydro-electric Project

机译：布纳卡哈水电站水库泥沙淤积研究

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This thesis presents a study on the sedimentation of the reservoir of the Bunakha Hydro-electric Project in Bhutan. Although the Detailed Project Report for this peaking reservoir scheme has already been completed, it has been used for further and additional investigations related to reservoir sedimentation. The sediment inflow into the reservoir was determined through two independent studies: i) Application of Pacific Southwest Interagency Committee (PSIAC) and Revised Universal Soil Loss Equation (RUSLE) approach integrated with Geographic Information System (GIS), ii) Data analysis of available suspended sediment data of Tamchu gauging station. The application of the PSIAC approach taking into account three different boundary conditions related to catchment properties resulted in estimates of the average annual sedimentation rate for the Bunakha catchment/watershed at the location of gauging station as 0.4 mm/year, 0.18 mm/year, and 0.63 mm/year, respectively. The determination of sedimentation rates based on the RUSLE approach was implemented in a GIS and estimated in two stages. First, the annual soil loss was determined using the RUSLE Model and in the second stage, the Sediment Delivery Ratio (SDR) was applied to estimate sediment yield. Using three different empirical SDR-equations, the estimated average annual sedimentation rate at the gauging station location using this approach was 0.303 mm/year, 0.203 mm/year, and 0.226 mm/year, respectively. The sediment load to the reservoir was also estimated from available data for the period 2009-2015 employing two approaches. In the first approach, the measured suspended sediment load was combined with bed load transport rates estimated from various computational approaches. In the second approach, both the suspended and bed load were computed. The average annual sedimentation rate resulted from these approaches ranged from 0.13-1.22 mm/year and that of bed load calculated ranged from 10-25% of the suspended sediment load. The comparison of the results from the different approaches showed that the estimated sedimentation rate ranged from 0.13-0.63 mm/year. For the subsequent prediction of the reservoir sedimentation, a mean value of 0.50 mm/year was used taking into consideration a safety factor of 1.3 to account for potential extreme events resulting from landslides due to glacier lake outbursts. New Zero-capacity Elevation (NZE) determined with the application of Empirical Area Reduction method for 30, 50 and 70 years are 1908 m, 1926 m and 1944 m respectively indicating that even after 70 years of reservoir operation, the sediment deposit level will be well below the Minimum Draw Down Level (MDDL) if there is no flushing of the sediments. However, the sediment will be flushed during monsoon season with low level spillway sluice that will be installed at 1915 m, whereby sediment will never rise beyond this level (DHPS, 2013). The perspective downstream impact due to reservoir sedimentation were studied through literature reviews.
机译：本文对不丹布纳卡水电站的水库沉积进行了研究。尽管已经完成了该峰值储层方案的详细项目报告，但已将其用于与储层沉积有关的进一步研究。通过两项独立研究确定了流入水库的泥沙流入量：i）太平洋西南地区跨部门委员会（PSIAC）的应用以及与地理信息系统（GIS）集成的经修订的通用土壤流失方程（RUSLE）方法，ii）可用悬浮液的数据分析潭中站的泥沙资料PSIAC方法的应用考虑了与流域特性有关的三种不同边界条件，得出的测量站布纳卡河流域/集水区的年平均沉积速率估计为0.4毫米/年，0.18毫米/年和每年0.63毫米。在GIS中实施了基于RUSLE方法的沉降速率测定，并分两个阶段进行了估算。首先，使用RUSLE模型确定年土壤损失量，然后在第二阶段中应用泥沙输送比（SDR）估算沉积物产量。使用三个不同的经验SDR公式，使用该方法在测井站位置估计的年平均沉积速率分别为0.303 mm /年，0.203 mm /年和0.226 mm /年。还使用两种方法从2009-2015年期间的可用数据估算了水库的泥沙负荷。在第一种方法中，将测得的悬浮沉积物负荷与根据各种计算方法估算的床层负荷输运速率相结合。在第二种方法中，既计算了悬架荷载又计算了床荷载。这些方法产生的年平均沉积速率范围为0.13-1.22 mm /年，计算的床层载荷的范围为悬浮沉积物载荷的10-25％。不同方法结果的比较表明，估计的沉积速率为0.13-0.63 mm /年。对于随后的储层沉积预测，使用了0.50毫米/年的平均值，并考虑了1.3的安全系数，以考虑冰川湖爆发导致的滑坡导致的潜在极端事件。应用经验面积减少法确定的30年，50年和70年的新零容量高程（NZE）分别为1908 m，1926 m和1944 m，这表明即使在水库运行70年后，沉积物的沉积水平仍为如果没有冲洗沉积物，则应远低于最低汲水量（MDDL）。但是，在季风季节，将在1915 m处安装低水位溢洪闸冲刷沉积物，从而使沉积物永远不会超过该水位（DHPS，2013）。通过文献综述研究了由于储层沉降对下游影响的观点。

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    Duba Choten;

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  • 年度 2016
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  • 正文语种 eng
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