Akarsu havzalarının morfometrik özelliklerinin bilinmesi, havza potansiyelinin hesaplanmasında ve havzada yapılacak her türlü planlamada büyük öneme sahiptir. Bu çalışmada Coğrafi Bilgi Sistemleri (CBS) kullanılarak Sabuncular Deresi Havzası'nın morfometrik ve hidrografik özelliklerinin incelenmesi amaçlanmıştır. 1/25.000 ölçekli sayısal topografya haritaları kullanılarak Digital Elevation Model (DEM) (Sayısal Yükseklik Modeli) oluşturulmuştur. Sayısal Yükseklik Modeli üzerinden belirlenen havza sınırına göre gerekli veri setleri ve morfometrik haritalar elde edilmiştir. Havzaların karakteristik özelliklerinden; havza sınırı, havzanın çevre uzunluğu, havza alanı, eğimi, bakısı, akış yönleri, drenaj ağları gibi morfometrik parametreler incelenmiştir. Ayrıca akarsuyun çatallanma oranı, sıklığı, yüzeysel akış uzunluğu, hipsometrik integrali ile havzanın lemniskat oranı, tekstür oranı, engebelilik oranı, dairesellik oranı, akım toplanma zamanı hesaplanmıştır. Tüm bu özellikler dikkate alınarak havzanın hidrografik özellikleri değerlendirilmiştir.
Due to the geographical features of Turkey, it can grow in almost every region. It is a valuable product for Turkey both economically and traditionally. Vine products are generally produced for domestic consumption in Turkey, and only a small proportion of the products are exported. For this reason, it is of great importance to produce grapes in areas with the most suitable growing conditions in order to increase productivity, ensure sustainability, and increase the share of vine products in foreign trade. This study aims to determine suitable areas for viticulture in Denizli province using the GIS and AHP methods and based on the criteria determined according to natural and human factors. The study further aims to evaluate the effect of determining the appropriate places for vineyards on the wine sector. Within the scope of this study, the natural and human factors that provide the most suitable environmental conditions were determined and divided into subcategories. The correlation of each category with the existing vineyards was calculated and evaluated using the frequency ratio method. Thus, the points to be received by each criterion were determined and based on this, a reclassification was made and the percentage within the study area was calculated. The distribution percentage of each criterion classified using the GIS Tabulate Area analysis within the total area was compared with the percentage of the existing vineyards and the frequency rates were found. Approximately 31% of the surface area of Denizli was found to be very appropriate or extremely appropriate for vineyards, which means that more than 70% of the existing agricultural areas are suitable for vineyards. The areas with the highest percentage of very low and low suitability are the natural vegetation and wetlands. 94% of the existing vineyards and almost all of the wineries are located on the areas with high and very high suitability, which is the reason why Denizli is on the foreground in the production of wine grapes. The expansion of vineyards and the increase in grape production with the selection of suitable areas emphasize the economic importance of viticulture, contribute to the current situation of the wine sector based on viticulture, and support the development of the sector.
Choosing the location of organic fertilizer production facilities is a critical issue for agricultural enterprises and the agricultural sector. In this study, which is focused on how the selection of the facility location according to the results of the suitability analysis will contribute to the agricultural sector and the environment, Tekirdağ province was chosen as the study area. In this direction, basic and sub-criteria were determined in the Analytical Hierarchy Process, and the number of organic fertilizer plants in the sub-criteria groups was specified. The resulting criteria were reclassified according to their importance. Basic criteria: physical, environmental and socio-economic criteria; Sub-criteria are slope, elevation, big soil groups, land use, land use capability classes, distance to road-railways, ports, settlements and electrical energy transmission lines. Consistency rates were calculated for each criterion. The criterion weights calculated in the Analytical Hierarchy Process were overlaid with ArcGIS 10.5 software in the Geographical Information Systems environment and a suitability map for the organic fertilizer plant was obtained. In line with the findings obtained, 81.01% of Tekirdağ province shows very high-high-medium suitability and existing organic fertilizer facilities are located in these areas. 8.20% of the province has been found to be very low suitability. The reason for this is that these regions contain national parks and forests. The fact that an organic fertilizer plant is close to the agricultural area is suitable in terms of proximity to the raw material and represents sustainability within the scope of economic input to the country. In this study, AHP method in GIS environment is proposed over Tekirdağ province to be used in the decision-making mechanism of national/international agricultural enterprises. Today, environmental impact assessment reports are generally taken into account in decision-making mechanisms for choosing the appropriate area. However, AHP and similar mathematical models are not used in these reports or decision-makers. In this study, according to the data obtained from the modeling of Tekirdağ province (75.11% agricultural land, 90% insufficient organic matter), it is suggested to increase the number of facilities that will meet the organic fertilizer need in the southwest region.
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