https://terra.journal.fi/issue/feed Terra 2021-06-22T09:36:42+03:00 Maarit Sireni maarit.sireni@uef.fi Open Journal Systems <p><em>Terra</em> on Suomen johtava maantieteellinen aikakauskirja. <em>Terra</em> ilmestyy neljä kertaa vuodessa sekä painettuna lehtenä että elektronisena Open Access -julkaisuna, jonka koko sisältö on avoimesti luettavissa välittömästi julkaisemisen jälkeen. <em>Terrassa</em> julkaistaan suomen- ja ruotsinkielisiä alkuperäistutkimuksia esitteleviä artikkeleita ja katsauksia sekä datankuvausartikkeleita, joiden julkaisemisesta päätetään nimettömän asiantuntija-arvioinnin jälkeen (kaksoissokko). Lisäksi julkaistaan opetusideoita ja -aineistoja, keskustelupuheenvuoroja, uutisia ja kirja-arvosteluja.<br><br><em>Terra</em>&nbsp;on indeksoitu Elsevierin ylläpitämässä Scopus-viittaustietokannassa. Lehti on arvioitu Julkaisufoorumin tasolle 2.&nbsp;</p> https://terra.journal.fi/article/view/99435 Maisematason geodiversiteetti Suomessa 2021-03-22T15:53:54+02:00 Helena Tukiainen helena.tukiainen@oulu.fi Jan Hjort jan.hjort@oulu.fi <p>The diversity of nature consists of two complementary components: biological diversity (biodiversity) and abiotic diversity (geodiversity). Biodiversity is widely acknowledged in both research, and conservation and management practices, whereas geodiversity (the variety of abiotic features and processes of the land surface and subsurface) is just emerging as a research and practical issue. In this study, we introduce the geodiversity concept in Finnish context and explore how landscape-scale geodiversity varies in Finland and between Finnish municipalities. In addition, we study how geodiversity varies between nature areas and human impacted areas and how Finnish strict nature reserves and national parks succeed in capturing geodiversity. According to the results, there is distinct geographical variation in geodiversity in Finland. The geodiversity of municipalities varies through the country but, on average, municipalities in the southern and northern parts of the country have especially high geodiversity values. Interestingly, human impacted areas have slightly higher geodiversity than nature areas. Nature conservation areas manage especially well in capturing geomorphological richness. This study emphasizes the need for the investigation of geodiversity on a national and sub-national level. Study of geodiversity provides information on nature beyond current biodiversity-focused perspectives, which can be further utilized in e.g., land-use and nature conservation planning.</p> 2021-06-22T00:00:00+03:00 Copyright (c) 2021 Terra https://terra.journal.fi/article/view/101421 Jokiuoman kartoitus ja virtausolosuhteiden mallinnus tukena perkauksen suunnittelussa: esimerkkinä Eurajoki 2021-05-18T22:18:36+03:00 Linnea Blåfield lmebla@utu.fi Teija Kirkkala teija.kirkkala@pji.fi Petteri Alho mipeal@utu.fi <p>Dredging has a significant effect on sediment transportation, water quality and flow conditions in a river channel. However, often the effects of dredging are not studied carefully in advance. One reason for this is the lack of suitable study approach. Studies on river dynamics require high quality geometric models of riverbed, banks and floodplain. Accurate terrain and bathymetric data are also crucial components of reliable hydraulic modelling. In this study, we created an approach to model the presumable impacts of dredging. We modelled high discharges and annual flooding magnitudes in Eurajoki River, SW Finland in its current form and after dredging. As the low-sloped channel is heavily vegetated, the aim of the dredging is to improve flow conditions by removing sediment and vegetation within a reach of 8 km. First, we created a geometric model of the riverine environment by combining riverbank topography from national Airborne Laser Scanning (ALS) data by the Finnish National Land Survey and bathymetry, gathered with an Acoustic Doppler Current Profiler (ADCP). The ADCP was attached to a kayak to enable access to shallow areas as well. This way, we were able to model the geometry of the fluvial forms within a few centimetres’ accuracy. Next, we modified the model of the river geometry using GIS software according to the dredging plan. Finally, we used a 2D Computational Fluid Dynamics to model the current and after dredging flow conditions during various flow events. We analysed the effects on dredging on the flood magnitudes and flow conditions based on the models and compared these to the present situation. These models offer improvements on river management and observing the effects on dredging.</p> 2021-06-22T00:00:00+03:00 Copyright (c) 2021 Terra https://terra.journal.fi/article/view/109373 Uutisia ja tiedonantoja 2021-06-10T16:43:39+03:00 Oskar Rönnberg oskar.ronnberg@helsinki.fi 2021-06-22T00:00:00+03:00 Copyright (c) 2021 Terra https://terra.journal.fi/article/view/107282 Motivointia maantieteen opintoihin 2021-04-26T10:40:50+03:00 Sirpa Tani sirpa.tani@helsinki.fi 2021-06-22T00:00:00+03:00 Copyright (c) 2021 Terra https://terra.journal.fi/article/view/107995 Säästä sivistävästi – Ilmatieteiden vaiheita ja vaikuttajia Suomessa 2021-05-17T10:20:34+03:00 Ismo Björn ismo.bjorn@uef.fi 2021-06-22T00:00:00+03:00 Copyright (c) 2021 Terra https://terra.journal.fi/article/view/107448 Tiedeneuvo on tarpeen 2021-04-26T10:45:15+03:00 Eerika Albrecht eerika.albrecht@uef.fi 2021-06-22T00:00:00+03:00 Copyright (c) 2021 Terra https://terra.journal.fi/article/view/109116 Kaupunkikokemuksen äärellä – teos arjen tutkimuksesta 2021-05-30T21:04:31+03:00 Anna Hakala anna.hakala@helsinki.fi 2021-06-22T00:00:00+03:00 Copyright (c) 2021 Terra https://terra.journal.fi/article/view/109052 Uutta tutkimuspohjaa itämerensuomalaisten kansojen alkuperän selvitykseen 2021-05-25T10:50:23+03:00 Jussi Kinnunen jpkinn@utu.fi <p>Kirjakatsaus prof. Valter Langin 2020 suomennettuun teokseen Homo Fennicus - Itämerensuomalaisten etnohistoria.</p> 2021-06-22T00:00:00+03:00 Copyright (c) 2021 Terra https://terra.journal.fi/article/view/108064 Yliopistojen uudet strategialinjaukset antavat mahdollisuuksia maantieteelle 2021-05-17T10:12:41+03:00 Tommi Inkinen toalin@utu.fi 2021-06-22T00:00:00+03:00 Copyright (c) 2021 Terra