This paper outlines the various approaches used to calculate bedload transport. As bedload transport exhibits considerable spatial and temporal variations, computing the bedload transport rates and morphological changes experienced by streambeds is difficult. A large body of experimental work has revealed scaling laws relating the mean transport rate to hydraulic conditions (that is, water discharge , bottom shear stress or stream power ω): , or . The most common approach used to calculate bedload transport has thus long involved determining the one-to-one function (or any other dependence of on or ω) from experiments or theoretical considerations. However, the predictive power of such relationships is limited: scientists are unable to predict to within better than one order of magnitude, and morphodynamic models based on fail to explain the development of bedforms without the use of additional assumptions. Progressively, other calculation approaches have appeared, with many relying on the idea that bedload transport is a macroscopic transport process that primarily reflects random particle motion at the grain scale. The present paper reviews the main ideas being explored today.

中文翻译：

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Bedload 运输：随机性和确定性之间的行走。第 1 部分. 最先进的技术

本文概述了用于计算底物运输的各种方法。由于底泥输送表现出相当大的时空变化，因此很难计算河床经历的底泥输送速率和形态变化。大量实验工作揭示了将平均传输速率与水力条件（即排水量、底部剪应力或河流功率 ω）相关的比例定律： , 或 。因此，用于计算床载传输的最常用方法长期以来一直涉及从实验或理论考虑中确定一对一函数（或 ω 或 ω 的任何其他依赖关系）。然而，这种关系的预测能力是有限的：科学家无法在一个数量级以内进行预测，和基于形态动力学的模型在不使用额外假设的情况下无法解释床型的发展。逐渐出现了其他计算方法，其中许多方法依赖于床载输运是一个宏观输运过程，主要反映颗粒尺度上的随机粒子运动的想法。本文回顾了今天正在探索的主要思想。