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 Predicting the annual erosion rates on a small stream by the BANCS model

2019 ◽  
Vol 14 (No. 4) ◽  
pp. 200-211
Author(s):  
Zuzana Allmanová ◽  
Mária Vlčková ◽  
Martin Jankovský ◽  
Michal Allman ◽  
Helena Hlavatá
Keyword(s):  
Hazard Index ◽  
Bank Erosion ◽  
Strong Relationship ◽  
Real Relationship ◽  
Small Stream ◽  
The Real ◽  
Erosion Rates ◽  
Erosion Prediction ◽  
Small Streams ◽  
The Relationship

The erosion of streambanks causes soil loss and degrades the stream habitat. To optimize the prevention of bank erosion, we first need to determine the most vulnerable places on banks. This can be done by the BANCS model. However, data are still missing on its accuracy in small streams. We measured the real annual erosion rates on 18 experimental sections established on the Lomnická stream. Using the Near Bank Stress (NBS) and Bank Erosion Hazard Index (BEHI) we developed the erosion prediction curves and evaluated the relationship between these two indices and the real annual erosion rates. We found a strong relationship between BEHI and real annual erosion rates, with R<sup>2</sup> = 0.72. The relationship between the NBS index and real annual erosion rates was also strong, with R<sup>2</sup> = 0.53. Then we constructed erosion prediction curves for very high and extreme BEHI and for moderate and high BEHI. Despite the strong correlation between BEHI and annual erosion rates, the prediction curves had no real relationship with real annual erosion rates, with R<sup>2</sup>= 0.004 and 0.15, respectively.  

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 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 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 Assessing the instability of Dong Nai River in Bien Hoa District using Bank Erosion Hazard Index (BEHI) and Remote Sensing and GIS

2019 ◽  
Vol 2 ◽  
pp. 1-5
Author(s):  
Pham Thi Huong Lan ◽  
Le Minh Nguyet ◽  
Le Thi Viet Hoa
Keyword(s):  
Hazard Index ◽  
Bank Erosion ◽  
Strong Relationship ◽  
Quantitative Prediction ◽  
Rooting Depth ◽  
Left Bank ◽  
River Bank ◽  
Surface Protection ◽  
Erosion Hazard ◽  
River Bank Erosion

<p><strong>Abstract.</strong> In this study, a method for developing a quantitative prediction of river bank erosion in Bien Hoa district in Dong Nai River is presented. The river bank erosion hazard index (BEHI) was estimated to assess the stability of the river bank erosion in consultation with bank height, bank slope, rooting depth, rooting density and surface protection. The estimated BEHI of Dong Nai River in Bien Hoa district are high which indicates the riverbank instability. The estimated BEHI along the left bank is about 25&amp;ndash;30. The satellite data of LANSAT TM 5, LANDSAT ETM 7 for the year 1995, 2005 and 2015 were used to assess the nature of shifting of the river bank and to estimate the land loss from river bank. All the derived images were transported on GIS environment to extract the course of the river. 13 sites were considered along the Dong Nai River in Bien Hoa District to estimate the leftward shifting of the bank line and to assess the shifting distance of the river bank line. There is a strong relationship between bank instability BEHI, shifting distance of the bank line and eroded bank area in this study.</p>

scholarly journals Kajian Tingkat Bahaya Erosi Untuk Arahan Konservasi Tanah Pada Berbagai Tipe Penggunaan Lahan Di Kecamatan Merdeka Kabupaten Karo

2018 ◽  
Vol 10 (1) ◽  
pp. 51
Author(s):  
Parlin Hotmartua Putra Pasaribu ◽  
Abdul Rauf ◽  
Bejo Slamet
Keyword(s):  
Land Use ◽  
Cover Crops ◽  
Soil Conservation ◽  
Secondary Forest ◽  
Hazard Index ◽  
Survey Method ◽  
Organic Mulch ◽  
Erosion Hazard ◽  
Erosion Prediction ◽  
Erosion Level

AbstrakTujuan penelitian ini untuk mengetahui tingkat erosi guna mendapatkan acuan konservasi tanah pada berbagai tipe penggunaan lahan di Kecamatan Merdeka. Penelitian ini menggunakan metode survei analisis prediksi erosi yang dilakukan dengan metode USLE. Hasil penelitian menunjukan bahwa laju erosi tertinggi terdapat pada penggunaan lahan tegalan yaitu sebesar 2.959,018 ton/ha/tahun, sedangkan erosi terendah terdapat pada penggunaan lahan permukiman yaitu sebesar 29,810 ton/ha/tahun. Erosi terbolehkan tertinggi dan terendah terdapat pada penggunaan lahan semak belukar yaitu masing – masing sebesar 36,96 ton/ha/tahun dan 6,81 ton/ha/tahun. Indeks bahaya erosi tertinggi terdapat pada penggunaan lahan Hutan sekunder yaitu sebesar 342 ton/ha/tahun, sedangkan indeks bahaya erosi terendah terdapat pada penggunaan lahan semak belukar yaitu sebesar 1,08 ton/ha/tahun. Ada 3 (tiga) kategori tingkat bahaya erosi di Kecamatan Merdeka yaitu tingkat bahaya erosi level sedang, tinggi, dan sangat tinggi. Teknik konservasi tanah mekanik yang digunakan seperti teras bangku, guludan, saluran penampungan air, saluran pengelak, dan penanaman sejajar kontur  sedangkan teknik konservasi vegetatif yaitu seperti tumpang sari, mulsa organik, pengkayaan tanaman keras, pohon serbaguna, kebun campuran, dan tanaman penutup tanah.  Kata kunci : Erosi Tanah metode USLE, Indeks Bahaya Erosi, Konservasi Tanah Abstract The purpose of this research is to know the level of erosion to get the reference of soil conservation on various types of land use in Merdeka District. This research used erosion prediction analysis survey method with USLE method. The results showed that the highest erosion rate was found on the using of  land, of 2,959,018 tons/ha/ year, while the lowest erosion was found on the use of settlement land of 29,810 tons / ha / year. The highest and lowest permissible erosion was found in the use of scrubland, of 36.96 ton / ha / year and 6.81 tons/ha/ year respectively. The highest erosion hazard index was found in secondary forest land use of 342 tons/ha /year, while the lowest erosion index was 1,08 tons /ha/year. There are 3 (three) categories of erosion hazard in Merdeka District, they are medium, high, and very high erosion level. Mechanical soil conservation techniques are used such as bench terraces, bunds, water reservoirs, ducts, and parallel planting of contours while vegetative conservation techniques such as intercropping, organic mulch, hardwood enrichment, multipurpose trees, mixed gardens, and cover crops. Keywords :  Soil Erosion USLE method, Erosion Hazard Index, Soil Conservation

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