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首页> 外文会议>2007 IYRF;International Yellow River Forum on Sustainable Water Resources Management and Delta Ecosystem Maintenance >A New Method for Estimating the Instream Ecological Water Requirement--Ecological Hydraulic Radius Approach
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A New Method for Estimating the Instream Ecological Water Requirement--Ecological Hydraulic Radius Approach

机译：估算河道生态需水量的新方法-生态水力半径法。

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This essay proposes an ecological hydraulic radius approach (EHRA) which considers both the watercourse information (including hydraulic radius, roughness coefficient and hydraulic gradient) and the required stream velocity necessary for maintenance of certain ecological functions all together. The EHRA not only meets the requirement of flow velocity for adequate fish spawning migration, but also is applicable to the ecological flows in regard with other ecological issues (such as the calculation of the instream flow requirements for transporting sediment (IFRTS) and for pollution self-purification, etc.). It has been illuminated that the computational process taking the estimation of ecological water requirement of Zhuba Hydrologyical Station watercourse in Niqu branch of the Yalong River as an example. The result shows that the Zhuba Hydrological Station ecological water requirement calculated by EHRA lies between the minimum and favorable instream ecological water requirement (IEWR) calculated by the Tennant approach. This is due to the fact that the ecological flow velocity (such as the fish spawning migration flow velocity) was taken into consideration, producing results applicable to the practical situation. Moreover we defined the permitting flow velocity by the conception of IFRTS, also put forward the ecological hydraulic radius approach (EHRA) to estimate IFRTS. The result shows that the IFRTS occupied 29.7%~59.5% of annual mean discharge in flood season, the average of IFRTS is about 100.2m 3/s during 1966~1987, it is close to the IFRTS 90m 3/s calculated by IFRTS conception. Hence, it is feasible to calculate IFRTS by using EHRA.
机译：本文提出了一种生态水力半径方法（EHRA），该方法同时考虑了河道信息（包括水力半径，粗糙度系数和水力梯度）以及维持某些生态功能所需的水流速度。 EHRA不仅满足流速要求，以使鱼类产生适当的产卵迁移，而且还适用于与其他生态问题有关的生态流量（例如，计算输沙沉积物的内河流量要求（IFRTS）和自身污染-净化等）。以雅long江泥渠支流竹坝水文站河道的生态需水量估算为例，说明了该计算过程。结果表明，EHRA计算得出的竹坝水文站生态需水量介于Tennant方法计算出的最小和有利河内生态需水量之间。这是因为考虑了生态流速（例如鱼卵产卵迁移流速），从而产生了适用于实际情况的结果。此外，我们根据IFRTS的概念定义了允许流速，并提出了生态水力半径法（EHRA）来估算IFRTS。结果表明，IFRTS占汛期年平均流量的29.7％〜59.5％，1966〜1987年IFRTS平均值约为100.2m 3 / s，接近IFRTS概念计算的IFmTS 90m 3 / s。 。因此，使用EHRA计算IFRTS是可行的。

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