The paper addresses the influence of intense sediment transport (bed load and debris flow) on the efficiency of the structures aimed at the interception of wood logs. In the literature different devices designed to intercept woods are proposed: steel barriers, net barriers, check dam with steel bars positioned in the opening. In this paper we firstly define some fundamental dimensionless parameter governing the phenomenon, in order to determine a rational criterion to evaluate the efficiency of the different kind of devices. In particular, we deepen the interaction between slit check dams and driftwood, in both bed load and debris flow conditions. Starting from the results of this first analysis, we propose some arrangements of steel bars be installed in the check dam. Through a laboratory experimental investigation, by now conduced in simplified conditions (i.e. spherical mono-dispersed sediments), we define some criteria to obtain the best design parameters for the bars, that is their optimal disposition and spacing, in function of the logs characteristics (mainly the lengths). We investigate also the influence of different lengths of the transported woods, finding a general criterion to evaluate an overall length representing the logs ensemble.

中文翻译：

---

开放式止水坝和防泥石流和浮木保护条的实验分析

本文探讨了强烈的泥沙输送（床荷载和泥石流）对旨在拦截木原木的结构效率的影响。在文献中，提出了设计用于拦截木材的不同装置：钢制护栏，网状护栏，带有开口的钢筋的防渗坝。在本文中，我们首先定义一些基本的无量纲参数来控制这种现象，以便确定一个合理的标准来评估不同类型设备的效率。特别是，在床荷载和泥石流条件下，我们加深了裂隙止水坝与浮木之间的相互作用。从第一个分析的结果开始，我们建议在止回坝中安装一些钢筋的布置。通过实验室实验调查 到目前为止，在简化的条件下（即球形的单分散沉积物），我们定义了一些标准，以根据测井曲线的特征（主要是长度）来获得棒的最佳设计参数，即棒的最佳布置和间距。我们还调查了运输的木材不同长度的影响，找到了一个通用标准来评估代表原木合奏的总长度。