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A method for improving predictions of bed-load discharges to reservoirs

机译：一种改进储层床荷排放量预测的方法

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摘要

Effective management options for mitigating the loss of reservoir water storage capacity to sedimentation depend on improved predictions of bed-load discharges into the reservoirs. Most predictions of bed-load discharges, however, are based on the assumption that the rates of bed-load sediment availability equal the transport capacity of the flow, ignoring the spatio-temporal variability of the sediment supply. This paper develops a semiquantitative method to characterize bed-load sediment transport in alluvial channels, assuming a channel reach is non-supply limited when the bed-load discharge of a given sediment particle-size class is functionally related to the energy that is available to transport that fraction of the total bed-load. The method was applied to 22 alluvial stream channels in the USA to determine whether a channel reach had a supply-limited or non-supply-limited bed-load transport regime. The non-supply-limited transport regime was further subdivided into two groups on the basis of statistical tests. The results indicated the pattern of bed-load sediment transport in alluvial channels depends on the complete spectrum of sediment particle sizes available for transport rather than individual particle-size fractions represented by one characteristic particle size. The application of the method developed in this paper should assist reservoir managers in selecting bed-load sediment transport equations to improve predictions of bed-load discharge in alluvial streams, thereby significantly increasing the efficiency of management options for maintaining the storage capacity of waterbodies.
机译：减轻水库蓄水能力因沉积而损失的有效管理方案取决于对流向水库的床荷排放的改进预测。然而，大多数对床荷排放的预测都是基于这样的假设，即床荷沉积物的可利用率等于水流的输送能力，而忽略了泥沙供应的时空变化。本文提出了一种半定量方法来表征冲积河床中的底泥沙运移，假设当给定沉积物粒度等级的底泥沙排放与可利用的能量在功能上相关时，河道的覆盖范围不受供应限制。运输总床载的那一部分。该方法已应用于美国的22个冲积河道，以确定河道的河段是否具有受供应限制或不受供应限制的河床负荷运输制度。在统计检验的基础上，非供应受限运输制度进一步细分为两组。结果表明，在冲积河道中床载沉积物的输送方式取决于可用于输送的沉积物粒度的完整谱，而不是由一个特征粒度代表的单个粒度级分。本文开发的方法的应用应有助于油藏管理者选择床荷输沙方程，以改进对冲积河床中床荷排放的预测，从而显着提高维持水体存储能力的管理选择的效率。

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