ABSTRACT:The Bumiaji area is an upstream river basin that has undergone land changes from an undeveloped to a developed area, which may cause a disturbance in the river basin. This research investigates the river basin using secondary data covering land use, land slope, rainfall, and soil types. The quality indicator of a river basin is measured from the quantity of surface runoff. The bigger the scale of the surface runoff is, the lower the quality of the river basin. This research aims to examine the effect of land use changes on the river basin condition, using surface runoff as the indicator. The result shows that the change of land use at Bumiaji affects the surface runoff coefficient and river discharge increment in the Bumiaji river basin. It is concluded that the runoff coefficient (C) increased in sub-river basins one to four, while it decreased in sub-river basin five.
Water spring (WS) conservation in the upstream area of Brantas River is intended to protect the potency of the main water spring in East Java Province that is being threatened. The threat occurred is caused by a lot of dry water springs, the lowering of river discharge in the dry season, the dam shallowness leading to the flood and the lack of water. Although the conservative activity has involved many agencies, a non-profit organization, local people and the higher education, the achievement rate is still low. The partial activities in the form of the pilot project, in the end, give priority to togetherness that is the establishment of village conservation. The variety of conservative village has been developed by many agencies in accord with the goal and its concept. For the recent time, the conservative village which has been established does not have any capability to take the roll as the pilot that led to the spirit of the other village society conservation. The physical condition variety of the river stream area and social society in upstream Brantas River influence the condition of the conservative village. Therefore, the research is done the research to find the formulation of conservative village condition in upstream Brantas which is conditioned to establish the conservative culture as the implementation of daily activity part. The evaluation result of middle-term village development planning by comparing the conservative need from the analysis shows that conservation has not become the important issue. Therefore it is suggested a regulation to compose village RPJM in order to pay attention to the rules of water spring resources conservation. Thus, composed village RPJM, if it is implemented, will improve the flow coefficient value without decreasing the importance of the other sector development.
Kemuning river flood is caused by watershed (DAS) quality factor, river capacity, and tidal influence. Effort of controlling that has been done is by making reservoir in upper stream, river normalization in the urban area, and pump installation in the mouth of river. Yet those efforts are not significantly decreasing the frequency of flood. In this paper, it proposed the installation of controlling gate in the downstream of the pump location as a means of controlling, so the current can only move one direction to the downstream of the river. The gate design is planned according to the topography of the local riverbed and utilized it as a long storage. To know the effectiveness of the plan, the performance analysis of long storage and the gate on flood of Kemuning river is conducted. The result of analysis shows that the peak of maximum hydrograph discharge Q2; Q5; Q10; Q25; Q50, is (m3/second): 121.608; 192.720; 220.258; 241.605; 263.558. The combination of long storage and one direction gate cannot control the discharge of flood for two years, therefore to control flood it needs additional water reservoir and or flood pump.
<span lang="ZH-CN">Kawasan Pertanian Pangan Berkelanjutan (KP2B) merupakan salah satu amanat untuk perlindungan pertanian pangan berkelanjutan </span><span lang="EN-US">berdasarkan </span><span lang="ZH-CN">U</span><span lang="EN-US">ndang-Undang Nomor</span><span lang="ZH-CN"> 41 Tahun 2009. Namun</span><span lang="EN-US">,</span><span lang="ZH-CN"> masih belum </span><span lang="EN-US">ditemukan</span><span lang="ZH-CN"> model pengembangan KP2B</span><span lang="EN-US"> dalam implementasinya</span><span lang="ZH-CN">. Pemerintah pusat dan pemerintah daerah </span><span lang="EN-US">cenderung</span><span lang="ZH-CN"> hanya dapat menentukan luas KP2B dalam bentuk tabular. Padahal</span><span lang="EN-US">,</span><span lang="ZH-CN"> diperlukan persebaran KP2B secara spasial</span><span lang="EN-US"> untuk kebutuhan perencanaan tata ruang wilayah untuk menjamin akurasi pengendalian</span><span lang="ZH-CN">. Ketidakjelasan persebaran KP2B secara spasial</span><span lang="ZH-CN">menjadi salah satu permasalahan dalam </span><span lang="EN-US">rencana </span><span lang="ZH-CN">peruntukan pemanfaatan ruang</span><span lang="EN-US">yang mengarah pada semakin sulitnya pengendalian</span><span lang="EN-US">p</span><span lang="ZH-CN">erubahan peruntukan sawah ke bukan sawah. Sehingga, diperlukan model persebaran KP2B sebagai cara dalam pengendalian alih fungsi peruntukan sawah abad</span><span lang="EN-US">i</span><span lang="ZH-CN"> untuk mewujudkan kemandirian, kedaulatan, dan ketahanan pangan. </span><span lang="EN-US">Penelitian ini bertujuan untuk</span><span lang="ZH-CN"> melakukan prediksi KP2B Jawa Timur melalui metode <em>cellular automata</em>. Tujuan tersebut dapat dicapai melalui</span><span lang="EN-US"> tiga</span><span lang="ZH-CN"> tahapan: (1) Menentukan sawah potensial untuk KP2B Jawa Timur; (2) Menghitung luas minimal sawah produktif Jawa Timur;</span><span lang="EN-US"> dan</span><span lang="ZH-CN"> (3) Membangun model spasial KP2B Jawa Timur. </span><span lang="EN-US">Hasil</span><span lang="ZH-CN"> penelitian ini menunjukkan bahwa lahan potensial untuk pengembangan KP2B adalah sebesar 852.892,82 </span><span lang="EN-US">h</span><span lang="ZH-CN">a</span><span lang="EN-US">. Dengan</span><span lang="EN-US">k</span><span lang="ZH-CN">ebutuhan pangan minimum sebesar 4.983.888,5 </span><span lang="EN-US">t</span><span lang="ZH-CN">on</span><span lang="EN-US">, maka</span><span lang="ZH-CN"> kebutuhan sawah minimum adalah seluas 767.617,01 </span><span lang="EN-US">h</span><span lang="ZH-CN">a. Model KP2B dibangun melalui metode <em>cellular automata</em> dan telah dilakukan validasi dengan tingkat akurasi sebesar 87%.</span>
The area of Jenon Water Source has been determined as tourism development area. This research is aimed to arrange the spatial development brief of Jenon Water Source. The method used in this research is descriptive qualitative method. The research result show that regional arranfement is needed. Where in the area arrangement in Sumber Jenon carried out in this project has a positive effect in Gunungronggo Village, which can improve the economy of the Gunungronggo Village community and improve the quality of Human Resources in Gunungronggo Village by adding a central souvenir in Sumber Jenon.
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