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Laboratory study of the effects of terrestrial coastal forests on the absorption of solitary wave force

Mirzakhani Golnaz, Ghanbari-Adivi Elham, Fattahi Rohollah

Acta Geophysica

2024

Vol. 72, no. 1

449--465

One of the beach protection techniques is using natural methods based on the coastal ecosystem. Studies show the reducing effect of forest covers on wave destruction intensity in different areas. However, it is not yet well understood how various densities of terrestrial coastal forest (TCF) affect the wave attenuation and reduce their strength. Studying the impact of various forest parameters, such as density, distance, and arrangement type on the wave force attenuation, this research measures the wave forces directly. TCF model was installed in a knife edge flume, which equipped with a load cell and an acoustic Doppler velocimeter. The experiments were performed in two staggered and parallel arrangements consisting of different densities from 12 to 273 stems per unit area. Based on obtained results, TCF had significant effects on the wave force absorption. An increase in the number of trees (density) increased TCF resistance force and the absorbed wave force. In its best, the TCF could absorb the wave force 3.76 times more than the no-TCF case. It could reduce the wave height by up to 81% at the highest density and maximum wave height. The absorbed wave force and drag coefficient rose as the number of rows of trees opposing the flow decreased and the intervals between trees were shortened. Increasing tree density from 12 to 273 stems per unit area increased the drag coefficient by the average of 61.82% for parallel and staggered arrangements, which means an average increase of 9.7% for each TCF row.

Urban ecosystem services – assessment of potential at the different spatial scale: an example of Poznań

Zwierzchowska I.

Ekonomia i Środowisko

2017

nr 1

207--225

The aim of the article is the mapping and assessment of ES potential in the scale of the city and identification of site-specific elements that support or reduce the ES potential at the site scale. For this purpose, a multi-criteria spatial analysis, mapping and field vision were conducted. The results showed urban areas with the lowest ES potential that are also characterized by the highest population density. At the site scale, land cover and land-use types with other anthropogenic elements that affect the ES potential and flow were identified. The results can be used to support the transformation process of the city toward nature-based solutions.