scholarly journals KAJIAN KONDISI BIOFOSIK LAHAN DAERAH ALIRAN SUNGAI DI SUBDAS CIUJUNG HULU, PROVINSI BANTEN

2021 ◽  
Vol 9 (1) ◽  
pp. 119
Author(s):  
Egidius Naitkakin ◽  
Latief Mahir Rachman ◽  
Yayat Hidayat
Keyword(s):  
Land Cover ◽  
Carrying Capacity ◽  
Vegetation Cover ◽  
Hazard Index ◽  
Buffer Zone ◽  
Forest Land ◽  
Degraded Land ◽  
Erosion Hazard ◽  
Erosion Index ◽  
Very High

The upstream of a watershed is a buffer zone and it protects the whole watershed. The degradation of a watershed is caused by uncotrolled uses of the land and exploitation of the nature resources such as forest, land, and water. It causes the changes in the carrying capacity of the watershed, especially in biophysical aspects. This research aims to study the watershed biophysical condition in Ciujung Hulu Watershed, Banten Province. Biophysical condition analyzed using Forestry Minister Regulation P.61/Menhut-II/2014 for degraded land class, land cover percentage, and Erosion Hazard Index. The condition of the land, such as degraded land, vegetation cover, and erosion index, analyzed using modification of Forestry Minister Regulation Perdirjen BPDAS PS Nomor P.4/V-SET/2013. The result of the study showed that the percentage of degraded land, vegetation cover percentage, and erosion index were 25,85% (severe degraded land), 9,77% (very low covered), and 30,89 (Very high).

scholarly journals PREDIKSI TINGKAT BAHAYA EROSI MENGGUNAKAN SISTEM INFORMASI GEOGRAFIS (SIG) DI DAERAH TANGKAPAN AIR DANAU WISATA BANDAR KAYANGAN

2017 ◽  
Vol 12 (2) ◽  
pp. 20-28
Author(s):  
Eva Suyanti ◽  
Hadinoto Hadinoto ◽  
Muhammad Ikhwan
Keyword(s):  
Land Cover ◽  
Soil Type ◽  
Soil Conservation ◽  
Hazard Index ◽  
Crop Management ◽  
Primary Data ◽  
Survey Method ◽  
Slope Length ◽  
Land Unit ◽  
Erosion Hazard

This study aims to determine the level of erosion hazard through erosion prediction by USLE method and Geographic Information System (GIS) at Water Catchment Area (WCA) Danau Wisata Bandar Kayangan. This research was conducted at WCA Danau Wisata Bandar Kayangan, Limbungan Village, District Rumbai, Pekanbaru. The research data was collected by survey method. Secondary data collection includes a slope digital map, land cover map, rainfall data, and soil type map of WCA Danau Wisata Bandar Kayangan. While the primary data is done by field checking to know land use pattern and soil type around WCA Danau Wisata Bandar Kayangan. The result shows that the erosivity index (R) is 108. The soil erodibility index (K) in Podsolik Merah Kuning (PMK) is 0.166. Slope length index (LS) on slope <8% flatland (20), 8 -15% ramps (15), 16 - 25% slightly steep (10). Crop management and soil conservation (CP) index covers settlement (1), Bush / 0.01), plantation (0,02), and lake (0,01). The result of overlay of rainfall maps, soil type, slope class, and crop management and soil conservation obtained 46 land units at WCA Danau Wisata Bandar Kayangan. The highest Erosion Hazard Index (EHI) is found on land unit 45 of 358 on residential land cover. The largest potential erosion on land unit 44 with soil loss is 41,189.45 ton / ha / yr. Level of EHI in WCA Area of Danau Wisata Bandar Kayangan includes Class EHI1: Very Light area of 32,627 ha; EHI Class 2: Lightweight of 59.86 ha; Class EHI 3: Medium area of 247.52 ha; Class EHI 4: Weight of 977,127 ha, Class EHI 5: Very Weight of 4,549.43 ha.

scholarly journals Bank instability and erosion problems in Bishnumati River, Kathmandu, Nepal

2006 ◽  
Vol 34 ◽  
pp. 109-116
Author(s):  
Basanta Raj Adhikari ◽  
Naresh Kazi Tamrakar
Keyword(s):  
Riparian Vegetation ◽  
River Sediments ◽  
Hazard Index ◽  
Bank Erosion ◽  
Buffer Zone ◽  
Rooting Depth ◽  
Width Ratio ◽  
Surface Protection ◽  
Erosion Hazard ◽  
Bagmati River

The Bishnumati River, a major tributary of the Bagmati River in the Kathmandu basin, suffers from bank erosion, river instability, and environmental degradation. These processes are responsible for the loss of sediments, modification of river morphology, loss of vegetative buffer zone, and deterioration of stream environment. Bank erosion hazard in the Bishnumati River was assessed at ten different reaches using bank height ratio, ratio of riparian vegetation rooting depth to bank height, rooting density percentage, bank slope, and bank surface protection. Vertical and lateral stability of the river was assessed at four reference segments, namely at Bishnumatigaun, Okhaltar, Mahadevtar, and Tamsipakha, respectively from upstream to downstream. The riverbanks in the Bishnumatigaun segment show fluctuating trends of bank erosion potential from upstream to downstream. All the four segments of the Bishnumati River are vertically unstable and all the segments except the Okhaltar are entrenched. The Tamsipakha and Okhaltar segments have a high risk of lateral shifting, as they possess high values of bank erosion hazard index, meandering width ratio, and width-depth ratio. The Bishnumati river is in a degrading condition and capable of eroding sediments. The main causes of river instability are the excavation of river sediments, encroachment on riverbanks, clearing of riparian vegetation, and canalization.

scholarly journals Bank erosion of the Tŕstie stream: BANCS model predictions vs. real bank erosion

2019 ◽  
Vol 67 (2) ◽  
pp. 121-128
Author(s):  
Zuzana Allmanová ◽  
Mária Vlčková ◽  
Martin Jankovský ◽  
Matúš Jakubis ◽  
Michal Allman
Keyword(s):  
Point Source ◽  
Hazard Index ◽  
Bank Erosion ◽  
Water Stream ◽  
The Real ◽  
Erosion Hazard ◽  
Erosion Prediction ◽  
Model Predictions ◽  
Very High ◽  
Sufficient Precision

Abstract This paper focused on predicting the bank erosion through the Bank Assessment for Non-point source Consequences of Sediment (BANCS) model on the Tŕstie water stream, located in the western Slovakia. In 2014, 18 experimental sections were established on the stream. These were assessed through the Bank Erosion Hazard Index (BEHI) and the Near Bank Stress (NBS) index. Based on the data we gathered, we constructed two erosion prediction curves. One was for BEHI categories low and moderate, and one for high, very high, and extreme BEHI. Erosion predicted through the model correlated strongly with the real annual bank erosion – for low and moderate BEHI, the R2 was 0.51, and for high, very high and extreme BEHI, the R2 was 0.66. Our results confirmed that the bank erosion can be predicted with sufficient precision on said stream through the BANCS model.

scholarly journals Estimation of Erosion Using the Universal Soil Loss Equation (USLE) Method in the Ranu Pani Watershed in the Taman Nasional Bromo Tengger Semeru

2022 ◽  
Vol 9 (1) ◽  
pp. 111-119
Author(s):  
Qowam Mutashim Maulana ◽  
Zaenal Kusuma ◽  
Kurniawan Sigitt Wicaksono
Keyword(s):  
Spatial Data ◽  
Soil Structure ◽  
Hazard Index ◽  
Granular Soil ◽  
Class Iii ◽  
Hazard Class ◽  
Erosion Hazard ◽  
Index Value ◽  
Almost All ◽  
Very High

The land problem that commonly occurs in Ranu Pani Watershed is erosion. Ranu Pani Watershed is an area located in the mountains with very high soil erosion. Therefore, it is necessary to conduct good management in the upstream and downstream areas. The first step before carrying out the management is to analyze the occurrence of erosion in the Ranu Pani Watershed. The purpose of this research was to predict the potential erosion and the distribution of spatial data.. The results of the research showed that the erosivity value in the Ranu Pani Watershed was 961.44 and heavy to very heavy class (0.50-0.77) of erodibility, soil texture was dominated by silt, fine granular soil structure, and moderate dominant permeability. 56.80% of the area (158.27 ha) has a slop class III (15-30%) with the land cover are natural forest with lots of litter, grasslands, shrubs, and fields of onions and potatoes. Land management is managed cultivation follows the contour line but without conservation. The result of the calculation showed that almost all areas have potential erosion value exceed the permissible erosion determination, with the potential erosion value are 1.92-4246.28 tha-1 yr-1, the range of permissible erosion value are 0.029- 1.2 tha-1 yr-1, and the erosion hazard index value is 1.57-143442.49. The results of the spatial analysis showed that 64.39% of the area (179.41 ha) has a very heavy erosion hazard class and 69.50% of the area (193.66 ha) has a very high erosion hazard index.

scholarly journals Prediction of erosion using the USLE method in the Malino Sub Watershed

2021 ◽  
Vol 886 (1) ◽  
pp. 012104
Author(s):  
Usman Arsyad ◽  
Andang Suryana Soma ◽  
Wahyuni ◽  
Fahira Nurul Amalia ◽  
Putri Fatimah Nurdin
Keyword(s):  
Land Cover ◽  
Population Growth ◽  
Soil Quality ◽  
Rainy Season ◽  
Soil Loss ◽  
Agricultural Land ◽  
Forest Land ◽  
Erosion Hazard ◽  
Open Land ◽  
Soil Loss Equation

Abstract One of the problems that occur in the Sub DAS Malino is population growth. The increase in population in an area will increase demand to encourage the community to convert forest land into non-forest land, especially agricultural land. It has an impact on erosion and flooding during the rainy season. The amount of erosion that occurs can result in damage and a decrease in soil quality; therefore, it is necessary to predict erosion using the Universal Soil Loss Equation (USLE) method. This study aims to determine the level of erosion hazard in the Malino sub-watershed, Jeneberang watershed. The data used in this study include data on land cover, rainfall, soil, and slope. The results showed that Sub DAS Malino has high erosion on the open land cover with 800.02 ton/ha/year of 0.44% area of the Sub DAS Malino.

scholarly journals CAMPOS TÉRMICOS URBANOS:

2019 ◽  
Vol 8 (2) ◽  
pp. 65-88
Author(s):  
Michaela Campos e Silva ◽  
Thiago Alves de Oliveira ◽  
Yan Carlos Gomes Viana ◽  
Cássia De Castro Martins Ferreira
Keyword(s):  
Land Cover ◽  
Surface Temperature ◽  
Vegetation Cover ◽  
Thermal Field ◽  
Urban Climate ◽  
Temperature Mapping ◽  
High Heating ◽  
Different Types ◽  
The City ◽  
Very High

O artigo objetivou analisar o campo térmico em três regiões urbanas da cidade de Juiz de Fora-MG, com tipos de uso e ocupação diferenciados. A metodologia utilizada foi o modelo geoespacial de potencial térmico, baseado na análise das variáveis de cobertura da terra e geoambientais, proposto por Ferreira (2014). O modelo utilizado trabalha com 5 classes de potencial de aquecimento, desde o baixíssimo potencial de aquecimento ao altíssimo potencial. A partir da aplicação do modelo áreas de maior adensamento se caracterizaram com alto potencial de aquecimento e áreas no qual prevaleceram a cobertura vegetal um baixo potencial de aquecimento, estes resultados foram confirmados pelo mapeamento da temperatura de superfície. Palavras-chave: clima urbano, temperatura de superfície, modelo geoespacial.    Abstract  The article aimed to analyze the thermal field in three urban regions of the city of Juiz de Fora-MG, with different types of use and occupation. The methodology used was the geospatial model of thermal potential, based on the analysis of the variables of land cover and geoenvironmental, proposed by Ferreira (2014). The model used works with 5 classes of heating potential, from the extremely low heating potential to the very high potential. Since the application of the model higher density were characterized with high heating potential and areas  which the vegetation cover prevailed a low heating potential, these results were confirmed by the surface temperature mapping. Keywords: urban climate, surface temperature, geospatial model.

scholarly journals Rehabilitation and soil conservation of degraded land using sengon (Falcataria moluccana) and peanut (Arachis hypogaea) agroforestry system

2018 ◽  
Vol 19 (1) ◽  
pp. 222-228 ◽  
Author(s):  
SRI SARMINAH ◽  
KARYATI KARYATI ◽  
KARMINI KARMINI ◽  
JHONATAN SIMBOLON ◽  
ERIKSON TAMBUNAN
Keyword(s):  
Arachis Hypogaea ◽  
Soil Conservation ◽  
Erosion Rate ◽  
Hazard Index ◽  
Agroforestry System ◽  
Height Increment ◽  
Degraded Land ◽  
Erosion Hazard ◽  
Ground Coverage ◽  
Hazard Level

Sarminah S, Karyati, Karmini, Simbolon J, Tambunan E. 2018. Rehabilitation and soil conservation of degraded land using sengon (Falcataria moluccana) and peanut (Arachis hypogaea) agroforestry system. Biodiversitas 19: 222-228. Rehabilitation and soil conservation effort on degraded lands is not always a success. Multiple factors, such as the field’ biogeophysical conditions and the choice of suitable plant species determine the effectivity of the rehabilitation program. Our research aimed to implement agroforestry system of sengon (Falcataria moluccana) and peanut (Arachis hypogaea) on degraded land at different soil slopes (a steep and a slightly steep slope gradient) and to analyze the effect of the system on silvicultural and hydro-orological aspects of the degraded land. The silvicultural parameters examined in this study were the ground coverage of peanut growth and the stem diameter and height of sengon trees. Meanwhile, the hydro-orological parameters included potential erosion rate, erosion hazard index, and erosion hazard level. Our study revealed that on the land with the slightly steep slope (15-25%), the survival rate of sengon reached 90%, the ground coverage of the peanuts was 70-80%, the diameter and height increment of sengon trees reached 2.47 cm/year and 17.58 cm/year, respectively. Meanwhile, the potential erosion rate was 20.05 ton/ha/year, with an erosion hazard index of 0.80 (low) and a low hazard level. In the steeper ground (25-40%), the survival rate of sengon reached 90%, the peanut coverage was 50-60% and the diameter and height increment of the sengon were 2.37 cm/year and 16.41 cm/year, respectively. In the steep ground, potential erosion rate was 45.50 ton/ha/year, with an erosion hazard index of 3.25 (moderate) and a low hazard level. We concluded that the rehabilitation and soil conservation using sengon-peanut agroforestry system effectively suppressed erosion rate to a low erosion hazard.

scholarly journals Impact of Land Cover Change on Soil Erosion Hazard in Northern Jordan Using Remote Sensing and GIS

2013 ◽  
Vol 19 ◽  
pp. 912-921 ◽  
Author(s):  
M.Minwer Alkharabsheh ◽  
T.K. Alexandridis ◽  
G. Bilas ◽  
N. Misopolinos ◽  
N. Silleos
Keyword(s):  
Remote Sensing ◽  
Soil Erosion ◽  
Land Cover ◽  
Land Cover Change ◽  
Remote Sensing And Gis ◽  
Erosion Hazard ◽  
Northern Jordan

scholarly journals Land Use and Land Cover Change Assessment in the Context of Flood Hazard in Lagos State, Nigeria

Water ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1105
Author(s):  
Dorcas Idowu ◽  
Wendy Zhou
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Flood Hazard ◽  
The State ◽  
Land Cover Type ◽  
Lulc Change ◽  
Cover Type ◽  
Lulc Changes ◽  
Lagos State ◽  
Very High

Incessant flooding is a major hazard in Lagos State, Nigeria, occurring concurrently with increased urbanization and urban expansion rate. Consequently, there is a need for an assessment of Land Use and Land Cover (LULC) changes over time in the context of flood hazard mapping to evaluate the possible causes of flood increment in the State. Four major land cover types (water, wetland, vegetation, and developed) were mapped and analyzed over 35 years in the study area. We introduced a map-matrix-based, post-classification LULC change detection method to estimate multi-year land cover changes between 1986 and 2000, 2000 and 2016, 2016 and 2020, and 1986 and 2020. Seven criteria were identified as potential causative factors responsible for the increasing flood hazards in the study area. Their weights were estimated using a combined (hybrid) Analytical Hierarchy Process (AHP) and Shannon Entropy weighting method. The resulting flood hazard categories were very high, high, moderate, low, and very low hazard levels. Analysis of the LULC change in the context of flood hazard suggests that most changes in LULC result in the conversion of wetland areas into developed areas and unplanned development in very high to moderate flood hazard zones. There was a 69% decrease in wetland and 94% increase in the developed area during the 35 years. While wetland was a primary land cover type in 1986, it became the least land cover type in 2020. These LULC changes could be responsible for the rise in flooding in the State.

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