Applications of Remote Sensing and GIS in Hydrological and Hydrogeological Studies

Integrated watershed management is a holistic approach aimed at linking upstream and downstream areas. It encompasses preventing the watershed from being polluted and maintaining the quality of water and prevention of soil erosion. Remote sensing and GIS techniques play a crucial role in assessing watershed conditions through modeling. These techniques are also very helpful in acquiring the spatial information of the land use, land cover, vegetation, water resources, etc. With the available data, characteristics of aquifers can easily be deciphered. Remote sensing aids in identifying and assessing the topographical features and alienates the unnecessary ones. Integration of GIS with remote sensing along with hydrological, hydrogeological, geomorphologic studies will make the practice of integrated watershed management more effective. The primary aim of this chapter is to encompass the remote sensing and GIS technologies currently in use for watershed monitoring and management.

Kajian Peran Stakeholder Pada Implementasi Kebijakan Pengelolaan DAS Terpadu, Studi Kasus DAS Krueng Aceh

Kerusakan daerah aliran sungai (DAS) semakin meningkat, disamping karena faktor perubahan tutupan lahan, faktor pengelolaan DAS juga menjadi pemicu. Peraturan Pemerintah (PP) No.37 Tahun 2012 dan Perda (Qanun) No. 7 tahun 2018 merupakan landasan pengelolaan DAS di Aceh. DAS Krueng Aceh merupakan DAS prioritas yang kondisinya kritis, pengelolaan DAS Krueng Aceh memerlukan penanganan terpadu oleh stakeholders terkait. Kajian ini bertujuan untuk menganalisis PP, Qanun, stakeholders pengelola DAS Krueng Aceh dan implementasi kebijakan berdasarkan perubahan kondisi biofisik DAS. Analisis yang digunakan kajian ini adalah analisis perubahan kondisi biofisik DAS, analisis stakeholders, serta analisis implementasi kebijakan. Berdasarkan hasil analisis kondisi biofisik DAS, tutupan lahan DAS Krueng Aceh dalam 10 tahun terakhir menunjukkan perubahan yang sangat signifikan pada tahun 2020, perubahan ini berdampak pada kondisi hidrologi DAS dimana terjadi perubahan debit sungai maksimum pada tahun 2020 sebesar 15.78 m³/detik dibandingkan tahun 2019 sebesar 10.09 m³/detik. Dari pendalaman isi PP dan Qanun diketahui hal pokok kegiatan pengelolaan DAS yakni ; peningkatan daya dukung DAS, pengelolaan sumber daya air, dan penataan ruang. Terdapat 20 stakeholders yang terlibat pengelolaan DAS Krueng Aceh, stakeholders pemerintah memiliki kepentingan yang tinggi dan sumber daya untuk melaksanakan kegiatan. Bila dilihat dari kondisi biofisik DAS tahun 2020 dan dikaitkan dengan peraturan perundangan, analisis stakeholders, serta analisis implementasi kebijakan dapat dikatakan bahwa kegiatan pengelolaan DAS secara terpadu belum berjalan sesuai isi kebijakan. Untuk mewujudkan hal tersebut perintah PP dan Qanun harus dilaksanakan secara tegas, Tim Koordinasi Pengelolaan DAS Terpadu (TKPDAS-T) yang sudah dibentuk harus sesegera mungkin difungsikan untuk mewujudkan implementasi kebijakan pengelolaan DAS terpadu.ABSTRACTWatershed damage is increasing, in addition to changes in land cover, watershed management factors are also a trigger. Government Regulation (PP) No.37 of 2012 and Perda (Qanun) No. 7 of 2018 is the cornerstone of watershed management in Aceh. Krueng Aceh watershed is a priority watershed whose condition is critical, the management of Krueng Aceh watershed requires integrated handling by relevant stakeholders. This study aims to analyze PP, Qanun, stakeholders of Krueng Aceh watershed management and policy implementation based on changes in watershed biophysical conditions. The analysis used by this study is an analysis of changes in the biophysical condition of the watershed, stakeholder analysis, and policy implementation analysis. Based on the results of the analysis of the biophysical condition of the watershed, the cover of the Krueng Aceh watershed in the last 10 years showed a very significant change in 2020, this change has an impact on the condition of watershed hydrology where there is a maximum river discharge change in 2020 of 15.78 m³ / second compared to 2019 of 10.09 m³ / second. From the deepening of the contents of PP and Qanun, it is known that the main things of watershed management activities are; increased watershed carrying capacity, water resource management, and spatial arrangement. There are 20 stakeholders involved in the management of the Krueng Aceh watershed, government stakeholders have high interests and resources to carry out activities. When viewed from the biophysical condition of the watershed in 2020 and associated with legislation, stakeholder analysis, and policy implementation analysis, it can be said that integrated watershed management activities have not been run with the contents of the policy. To realize this, the PP and Qanun orders must be implemented strictly, the Integrated Watershed Management Coordination Team (TKPDAS-T) that has been established must be as soon as possible to realize the implementation of integrated watershed management policies.

Integrated Watershed Management Framework and Groundwater Resources in Africa- A Review of West Africa Sub-region

Human activities mostly impact the trend and direction of surface water, groundwater, and other river basin resources in the watershed in Africa. Human activities influence river flows and the water quality at both highlands and lowlands. A watershed is indeed a conserved area of land that collects rain and snow and empties or penetrates into ground water sources. The act of managing the activities around the watershed is the Integrated Watershed Management while considering the social, economic, and environmental issues, as well as community interests to manage water resources sustainably. These watersheds, river basins, and groundwater resources provide important services for communities and biodiversity. This paper reveals that the best way to protect groundwater resources is on a watershed basis using IWM. This technique enables us to handle a variety of concerns and objectives while also allowing us to plan in a complicated and uncertain environment. IWM involves cooperation and participation from a wide range of community interests and water users, including municipalities, companies, people, agencies, and landowners, for stakeholders' input to be successful. All of the strategies and plans are produced concerning one another, as well as the overall conditions of the watershed, local land uses, and specific issues.

Water Security: A Geospatial Framework for Urban Water Resilience

Urban water issues impacting sustainable development can be analyzed, modeled, and mapped through cutting-edge geospatial technologies; however, the water sector in developing countries suffers various spatial data-related problems such as limited coverage, unreliable data, limited coordination, and sharing. Available spatial data is limited to the aggregate level (i.e., National, State, and District level) and lacks details to make informed policy decisions and allocations. Despite significant advancements in geospatial technologies, its application and integration at the policy and decision-making level are seldom. The current research provides a unique, holistic Geospatial Framework to measure and monitor water security through geospatial technologies. The study demonstrates the application of the proposed Geospatial Framework from technical and institutional perspectives in water-stressed zones in Pune city showing where and how to solve problems and where proposed actions can have the most impact on creating a sustainable water-secured future. The research encourages cross-disciplinary collaboration, decentralized activity, employing traditional and indigenous knowledge, green infrastructure, watershed management, and nature-based solutions through Geospatial Framework to solve the primary challenges of water and build our cities' resilience. The current research can collaborate with Municipal Corporation mutually beneficial and work towards open-linked geospatial data for water security.

Multidimensional scaling approach to evaluate sustainability status of belawan watershed management

Sustainability is currently a global issue, population growth and damage to natural resources, and environmental quality issues. This study will evaluate the sustainability of Belawan watershed management to develop sustainable watershed management planning. Watershed sustainability evaluation uses the MDS approach with rapfish (Rapid Appraisal for Fisheries) program modification to 5 dimensions and 42 attributes. From the assessment, the sustainability status of the Belawan watershed for ecological, economic, social culture, institution and legal dimensions is less sustainable. In contrast,the level of technology dimension is not sustainable. With the scenario of moderate improvement obtained, the status of sustainability ecological dimension, economic dimension, social culture dimension, and institutions legal dimension are reasonably sustainable.In contrast,the technology dimension is less sustainable. For optimistic improvement scenarios, all dimensions are reasonably sustainable. Sustainable watershed management needs to be done in an integrated manner that covers all institutions and related stakeholders.

Effects of biological works within the integrated watershed management of torrent catchments in the area of Grdelica Gorge and Vranjska Valley (Serbia)

Integrated watershed management is based on the application of various biological and technical works, and administration measure to reduce the degradation process. The paper presents an analysis of the effects of performed biological works as part of integrated watershed management within the Grdelica Gorge and Vranjska Valley. Extensive erosion control works were carried out in the second half of the 20th century. As vegetation is one of the key factors in mitigating the erosion process, the paper presents the trend of connecting the surface with the vegetation cover, which results from implemented biological measures. Using multispectral satellite imagery (Landsat missions) for 1972, 1986, 1996, and 2017, the vegetation index (Normalized Difference Vegetation Index – NDVI) was analyzed in torrent basins, which were afforested to control severe erosion processes. The increasing trend of vegetated areas was recorded in period from 1986 to 1996 (very low vegetation coverage 40.19 % in 1986 and 8.19 % in 1996, respectively), which continues to grow until 2017 when the very low vegetation coverage was 0.26 %, and moderately high vegetation coverage was 50.63 %.