Provision of land resources for the sustainable sengon raw material industry in Bedadung Jember Watershed

Sengon (Paraserianthes falcataria) is a mainstay commodity as an industrial raw material, so it has high economic value. The domino effect that appears is the increase in the area of ​​​​sengon land and causes changes in land use. Land conversion will be vulnerable to erosion and increase the level of erosion hazards. Inappropriate land changes will also threaten the sustainability of the agroindustry, therefore it is necessary to evaluate the suitability of the sengon plant land. This study aims to identify the suitability of sengon land in the Bedadung watershed for sustainable agro-industry development. The analyzed parameters are 14 and the method used is matching and overlay. The results of land suitability analysis on dominant sengon plants were categorized as S3 "marginally appropriate" (48.07%). The limiting factor for sengon plants is rainfall as a source of water and soil solum. Efforts to increase the rainfall factor are to build reservoirs or dams, but these improvements require a lot of money and time. Meanwhile, efforts to improve soil solum are difficult because it takes a long time. Thus, the sengon commodity in Jember Regency will experience sustainability problems if the limiting factor is not found a solution.

Land cover changes monitoring over ten years in upstream watershed of Deli Serdang Regency North Sumatra Province

Deli Serdang is one of the regencies in North Sumatra Province, experiencing relatively rapid development and population. Increasing in demand for the availability of land as living space. Two sub-districts of upstream watershed experienced changes in land cover, namely; Sinembah Tanjung Muda (STM) Hilir and STM Hulu. Monitoring changes in land cover in both sub-districts is essential, given that they are located in the upstream area of the watershed and will impact other areas in the lower watershed. This study aims to analyse land cover changes in both sub-districts over ten years (2009 - 2019). The method used in calculating land changes that occur is change detection. Field surveys were carried out to ensure that the land cover conditions on the land cover maps followed the field’s actual conditions. The research shows the period of 2009 – 2019, land cover that has increased in the area are mining, industry, open land, settlements, livestock and shrubs. The decrease in the area occurred in land cover, including dryland forest, mixed gardens and cultivated land.

Prediksi Perubahan Lahan Terbangun Dengan OBIA LCM Pada Citra Terfusi di Kota Kendari

Abstrak: Penggunaan lahan disetiap tahunnya akan mengalami perubahan. Perkembangan tersebut bisa jadi tidak terkendali, sehingga perencanaan prediksi perubahan lahan penting untuk dikaji. Dalam memprediksi dapat dilakukan dengan menggunakan citra, khususnya citra Landsat. Penelitian ini bertujuan untuk: (1) distribusi penggunaan lahan terbangun di Kota Kendari pada tahun 2014 dan 2019 dengan metode OBIA pada citra terfusi; (2) melihat arah perubahan penggunaan lahan terbangun di Kota Kendari pada tahun 2024 dan 2029 dengan metode Land Change Modeler (LCM). Metode yang digunakan dalam penelitian ini yaitu metode klasifikasi penggunaan lahan berbasis piksel OBIA dan pemodelan prediksi perubahan penggunaan lahan Land Change Modeler (LCM). Hasil penelitian ini antara lain: (1) luas lahan terbangun pada tahun 2014 di Kota Kendari seluas 6.061,85 hektar dan luas penggunaan lahan terbangun di Kota Kendari pada tahun 2019 seluas 6.716,96 hektar dengan perubahan penggunaan lahan terbangun tahun 2014 sampai dengan tahun 2019 dengan pertambahan luas 2,43%; (2) Arah perubahan penggunaan lahan terbangun di Kota Kendari diprediksikan cenderung berkembang ke arah Kecamatan Baruga karena dipengaruhi oleh dua faktor yaitu kemiringan lereng dan jaringan jalan. Kata Kunci : Penggunaan Lahan, Landsat 8 OLI, Penajaman Citra, OBIA, LCM Abstract: Land use will change every year. The development may be uncontrollable, so predictive planning of land changes is important to review. In predicting can be done using imagery, especially Landsat imagery. This study aims to:(1) the distribution of land use built in Kendari City in 2014 and 2019 with OBIA method on diffusion imagery; (2) see the direction of land use changes built in Kendari City in 2024 and 2029 with land change modeler (LCM) method. The methods used in this study are OBIA pixel-based land use classification method and land use change prediction modeling land change modeler (LCM). The results of this study include: (1) land area built in 2014 in Kendari City aswide as 6,061.85 hectars and land use area built in Kendari City in 2019 aswide as 6,716.96 hectars with land use changes built in 2014 to 2019 with an increase of 2.43%; (2) The direction of land use changes built in Kendari City is predicted to tend to develop towards Baruga Subdistrict because it is influenced by two factors, namely slope and road network. Keywords: Land Use, Landsat 8 OLI, Image Sharpening, OBIA, LCM

Impact of Agricultural Land Changes on Farmers’ Income in Cirasea Watershed, Bandung Regency, West Java

Changes from agricultural land to non-agricultural land are continuously occurring, especially in areas adjacent to cities. Land changes from agricultural to non-agricultural land will eliminate crops’ hydrological function, impacting rivers, including the Cirasea River. Besides, changes in agricultural land have an impact on the resulting agricultural productivity and income. This study’s main objective is to determine land area changes, productivity, and farmers’ income in 2011 - 2018 in the Cirasea watershed. A literature study was applied to this study. Secondary data were obtained from the Central Bureau of Statistics of Ciparay, Ibun, Kertasari, Majalaya, Pacet, and Paseh Districts, Bandung Regency in Cirasea River Upstream. The study results showed an increase in land area, productivity, and agricultural income for vegetables (75%, 50%, and 68%, respectively) and rice field (16%, 0.32%, and 0.32%). In addition, there was a decrease in land area followed by a decrease in agricultural productivity and income for fruit commodities (-88%, -35%, -33%) and plantations (-97%, -1%, -1%). For eight years, farmers have relied on their income from vegetable commodities in Cirasea Watershed.

Empowering her guardians to nurture our Ocean’s future

Coastal Indigenous and Traditional communities are starting to see changes to their lives from climate change, whether this is from species range changes or displacement from land changes. For many of these communities, the ability to adequately adapt to these changes is limited by the governance structures they are required to live within, which differ from their customary practices and culture. In November 2019, a group of Indigenous and Traditional Peoples, attended the Future Seas 2030 workshop and discussed the consequences of climate change, the biggest barriers for their communities, and barriers for using traditional knowledge in order to contribute towards a more sustainable future that in the end will benefit all of earth’s people. The aim of this workshop was to highlight and give a voice to the various backgrounds and real-life situations impacting on some of the world’s Indigenous and Traditional communities whose connection with the oceans and coasts have been disrupted. This paper presents these issues of oppression, colonisation, language and agency, making it difficult for these groups to contribute to the current management of oceans and coasts, and asks scientists and practitioners in this space to be allies and enable the needed shift to earth’s guardians taking a leading role in nurturing her for our future.

Aerial Photogrammetry in the American West: Documenting the Construction of Cattle Water Tanks by Texas Cowboys

Aerial photogrammetry is increasingly being used to discover, document, and interpret the cultural heritage of landscapes. Information on the constructed cultural heritage left behind by the first cattle ranchers in the American West is being lost as the land is transformed and modified, and stewardship of the land changes across generations. An unmanned aerial vehicle (UAV) has been used in this research to record and interpret two surface water cattle tanks constructed by Texas cowboys in the mid-1880s. Similar size rocks have been used and placed in a similar pattern across the walls of both tanks. This similarity suggests both tanks were constructed at the same time. This research also demonstrates that UAV photogrammetry can be used to rapidly record and analyze the constructed cultural heritage of American West cowboys.

Construcción social del desastre detonado por el sismo 19S en las alcaldías Tláhuac y Xochimilco, Ciudad de México / / / \ \ \ Social Construction of Disaster Triggered by the 19S Earthquake in the Municipalities of Tláhuac y Xochimilco, Mexico City

Resumen: El Sismo 19S detonó un desastre en la CDMX; miles de viviendas en las alcaldías Tláhuac y Xochimilco presentaron daños. El objetivo de este texto es comprender las causas antrópicas del desastre mediante el análisis de estudios académicos, informes oficiales, variables espaciales y observación en campo. La investigación permitió vislumbrar la incidencia de causas sociales en el desastre: la expansión urbana de la Ciudad sobre el suelo de conservación ecológica, los cambios de uso de suelo de agrícola y forestal a urbano, el crecimiento de asentamientos irregulares y vivienda precaria, el incumplimiento de reglamentos de construcción y la sobreexplotación de agua subterránea en el sureste de la cuenca de México; todo esto derivado de políticas habitacionales, de gestión del agua y suelo. La importancia del estudio radica en que pone de manifiesto la necesidad de impulsar una política de mitigación y prevención de desastres vinculada al modelo de desarrollo. Palabras clave: riesgo, vulnerabilidad, amenaza, desarrollo, vivienda. Abstract: The 19S earthquake triggered a disaster in the CDMX; thousands of homes in the Tláhuac and Xochimilco municipalities were damaged. The objective of this text is to understand the anthropogenic causes of the disaster through the analysis of academic studies, official reports, spatial variables and field observation. The research provided a glimpse of the incidence of social causes in the disaster: the urban expansion of the city on ecological conservation land, changes in land use from agricultural and forestry to urban, the growth of irregular settlements and precarious housing, non-compliance with building regulations and overexploitation of groundwater in the southeast of the Mexico basin. All this derived from housing, water, and land management policies. The importance of the study lies in the fact that it highlights the need to promote a disaster mitigation and prevention policy linked to the development model. Key words: risk, vulnerability, hazard, development, housing.

Analisis Pengaruh Perubahan Lahan terhadap Debit Banjir pada Sub Das Cibeureum, Kawasan Bandung Utara

ABSTRAKSub DAS Cibeureum merupakan bagian dari Kawasan Bandung Utara. Pertumbuhan jumlah penduduk mengakibatkan pembangunan terus meningkat dan karena kondisi udaranya sejuk serta pemandangannya indah, Kawasan Bandung Utara menyebabkan lokasi ini banyak diminati. Akibat pemanfaatan lahan untuk pembangunan villa dan kawasan wisata adalah terjadinya perubahan lahan setiap tahunnya. Kawasan Bandung Utara berada di kawasan perbukitan, tersusun oleh batuan vulkanik dan memiliki curah hujan yang cukup tinggi (±1500 - 2500 mm/tahun), sehingga lokasi ini sebagai kawasan resapan air yang baik sehingga memiliki potensi airtanah yang besar. Namun, perubahan lahan yang terus menerus terjadi mengakibatkan kawasan resapan tidak berfungsi dengan baik dan memperbesar debit limpasan permukaan. Akibatnya dapat terjadi krisis sumber daya air dan menyebabkan permasalahan baru salah satunya adalah banjir di hilir sungai. Oleh karena itu, perlu diketahui seberapa besar perubahan tata guna lahan di Sub DAS Cibeureum dan dampaknya terhadap besar debit limpasan di hilir Sub DAS. Dalam penelitian ini penulis menganalisis perubahan lahan dan besar koefisien run-off di Sub DAS Cibeureum pada tahun 2006, 2009, 2011, 2015, 2016, dan 2017. Selanjutnya penulis mengitung besar debit banjir rencana periode ulang 2, 5, 10, 20, 50, dan 100 tahun dengan menggunakan metode rasional. Dari hasil perhitungan didapat bahwa nilai koefisien run-off meningkat setiap tahunnya yang mengakibatkan perhitungan debit banjir rencana berubah dan meningkat. Oleh karena itu, dapat disimpulkan bahwa dalam perencanaan infrastruktur bangunan air atau saluran drainase untuk pengelolaan air perlu dilakukan evaluasi setiap tahunnya dikarenakan tutupan lahan dan nilai koefisien run-off dapat berubah setiap tahunnya.Kata kunci: debit banjir, Kawasan Bandung Utara, koefisien limpasan, perubahan tutupan lahanABSTRACTCibeureum sub-watershed is part of the North Bandung area. The growth in population has resulted in development continuing to increase and due to the cool air conditions and beautiful scenery, the North Bandung area has made much in demand. The result of land use for the construction of villas and tourist areas is that the land changes every year. The North Bandung area is located in a hilly area, composed of volcanic rocks, and has a fairly high rainfall (± 1500 - 2500 mm / year), so this is a good water catchment area meaning has great groundwater potential. However, land changes that continue to occur have resulted in the infiltration area not functioning properly and increasing the discharge of surface run-off. As a result, a water resource crisis can occur and cause new problems, one of which is flooding downstream of the river. Therefore, it is necessary to know the extent of land-use change in the Cibeureum Sub-watershed and its impact on the amount of run-off discharge downstream of the Subwatershed. In this study, we analyzed land changes and the run-off coefficient in the Cibeureum sub-watershed in 2006, 2009, 2011, 2015, 2016, and 2017. Next, we calculated the flood discharge plans for the return period of 2, 5, 10, 20, 50, and 100 years using the rational method. From the results, it was found that the run-off coefficient value increases every year and it causes the design flood discharge to changes and increases as well. Therefore, it can be concluded that in planning water infrastructure or drainage channels for water management it is necessary to evaluate every year because the land cover and run-off coefficient values can change every year.Keywords: flood discharges, North Bandung Area, run-off coefficient, land-use change