Sediment deposition is an issue affecting many rivers. To oppose it, sediment withdrawals are often used. However, this practice can trigger further problems in river and coastal sections but, on the other hand, periodic removal of deposited sediments can reduce flooding risk. Also, these sediments can be used for beach nourishment. Therefore, before carrying out a sediment withdrawal, it is necessary to analyze the whole basin to evaluate the consequences for the sediment balance. This paper describes a methodology to evaluate the effects of river sediment withdrawals through a case study on the Amendolea River, a torrential river in southern Italy. In particular, the methodology is divided into three main phases. The first phase was developed with GIS software in order to perimeter and to morphometrically characterize the river basin and its hydraulically and sedimentologically homogeneous sub-basins. The second phase was developed using the HEC-HMS software in order to evaluate the hydrological balance of the basin and its sub-basins. The last phase was developed using the HEC-RAS software (through the SIAM model) in order to identify the areas in erosion, in deposition and in equilibrium. Moreover, through this model is possible to identify the sections where sediments can be withdrawn, and to estimate the possible morphological river changes due to withdrawals. In this case study, the sediments will be taken from the sections where the bottom has elevations near or above those of adjacent lands, such as to increase the flooding risk. Sediment withdrawals will be taken without eroding the bottom and at a distance from the river banks that does not unstabilize them. Finally, the methodology described in this paper is based on the joint use of various open source software and can be used in any other river with hydrological regime similar to the Amendolea River.

沉积物沉积是影响许多河流的问题。与之相反的是，经常使用沉积物抽取。但是，这种做法可能会在河流和沿海地区引发更多的问题，但是，另一方面，定期清除沉积的沉积物可以降低发生洪灾的风险。而且，这些沉积物可用于海滩营养。因此，在进行沉积物抽取之前，有必要分析整个盆地，以评估沉积物平衡的后果。本文以意大利南部的洪流河Amendolea河为例，介绍了评估河流沉积物撤除效果的方法。特别是，该方法分为三个主要阶段。第一阶段是使用GIS软件开发的，以便对流域及其水力和沉积均匀的次流域进行周长分析和形态表征。为了评估流域及其子流域的水文平衡，使用HEC-HMS软件开发了第二阶段。最后一个阶段是使用HEC-RAS软件（通过SIAM模型）开发的，目的是确定侵蚀，沉积和平衡区域。此外，通过该模型，可以识别出可以提取沉积物的区域，并可以估算出由于提取而可能引起的河流形态变化。在本案例研究中，沉积物将从底部海拔接近或高于相邻土地海拔的剖面中提取，以增加洪水风险。沉积物的抽取将不会侵蚀底部，并且与河岸保持一定距离，但不会使它们不稳定。最后，本文描述的方法是基于各种开源软件的联合使用，并且可以在水文状况与阿门多莱河相似的任何其他河流中使用。