ABSTRACT

In Sweden, drainage and the construction of water infrastructure have influenced agriculture in the last few centuries both positively and negatively. Recently, a trend has set in where wetlands are constructed to retain water, retain and reduce nutrients and to enhance the biodiversity. This study aimed to use remote sensing techniques to study landscape water retention over time. In this pilot study, water retention structures in Gotland (57°28′35.0′′N18°29′ 13.9′′E) and Kalmar Län (56°39′41′′N16°21′46′′E) for 2000/2001 and 2020 were identified and analyzed using Landsat data. In this study, it was found that the number of water retention structures (>0.8 ha) increased from 44 to 101 for Gotland Län and from 44 to 127 for Kalmar Län. Most water retention structures were <4 ha and were located in mid- and downstream areas. A comparison of the remote sensed results with the Swedish Meteorological and Hydrological Institute (SMHI) database showed a disagreement of the spatial coordinates of the wetlands in the database with the water retention structures. This pilot study has shown that remote sensed data can be used to identify water retention structures, although higher resolution imagery would be highly advisable in these kinds of studies.

摘要

在瑞典，排水和水利基础设施的建设在过去几个世纪对农业产生了积极和消极的影响。最近，建造湿地以保留水分、保留和减少养分以及增强生物多样性的趋势已经形成。本研究旨在使用遥感技术来研究随时间变化的景观保水性。在这项试点研究中，Gotland (57°28′35.0″N18°29′13.9″E) 和 Kalmar Län (56°39′41″N16°21′46″E) 的 2000/使用 Landsat 数据识别和分析 2001 年和 2020 年。在这项研究中，我们发现 Gotland Län 的保水结构（>0.8 公顷）从 44 个增加到 101 个，Kalmar Län 从 44 个增加到 127 个。大多数保水结构小于 4 公顷，位于中下游地区。遥感结果与瑞典气象水文研究所 (SMHI) 数据库的比较表明，数据库中湿地的空间坐标与保水结构不一致。这项试点研究表明，遥感数据可用于识别水潴留结构，尽管在这类研究中更建议使用更高分辨率的图像。