Yellow River Estuary Coastline Change Analysis before and after the Water and Sediment Regulation in 12 Years

2014 ◽  
Vol 955-959 ◽  
pp. 3883-3886
Author(s):  
Hai Bo Yang ◽  
Yun Fei Li ◽  
Jia Hua Wei
Keyword(s):  
Yellow River ◽  
River Estuary ◽  
Yellow River Delta ◽  
Change Analysis ◽  
Water Index ◽  
Coastline Change ◽  
Water And Sediment ◽  
Before And After ◽  
Normalized Difference Water Index ◽  
Water And Sediment Regulation

Based on the Landsat TM images of the Yellow River Delta from 2002 to 2013, the coastlines before and after water and sediment regulation in each year were extracted by the Normalized Difference Water Index (NDWI) with RS and GIS software. The dynamic changes of coastlines were analyzed in combination with the conditions of water and sediment regulation. The results show that the coastlines were generally pushed ahead though it changed ahead and back alternately in the past decade. The coastline near the estuary changed more obviously than other area. There is a positive linear relationship between the rate of the coastline pushing ahead and the ratio of the water and sediment quantity discharged into the sea in this region.

Effect of Ecological Water Supplement on Land Use and Land Cover Changes in Diaokou River

2013 ◽  
Vol 864-867 ◽  
pp. 2403-2407 ◽  
Author(s):  
Guo Tao Dong ◽  
Kui Huang ◽  
Su Zhen Dang ◽  
Xiao Wei Gu ◽  
Wen Li Yang
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Large Scale ◽  
Yellow River ◽  
Yellow River Delta ◽  
The Yellow River ◽  
Land Cover Changes ◽  
Water And Sediment ◽  
Before And After ◽  
The Impact

Diaokou River is one of the old courses of the Yellow River access to the sea before 1976 and its estuarine delta is an important part of National Nature Reserve of Yellow River Delta. The Yellow River Conservancy Commission decided the ecological water supplement to the wetland during the water and sediment regulation period in 2010. In this study, we analyzed the land use and land cover changes before and after the ecological water supplement in Diaokou River by using HJ-1B CCD data. The impact of the ecological water supplement on land use and land cover changes in Diaokou River was remarkable. The expansion of shrub-grassland and water body at large scale is conspicuous, while decreasing areas of shallows was 15.03 km2 and unutilized land decreasing amplitude was 28%. The main area of land use change was in Yiqianer protected areas, where concentrated in the estuary of the Diaokou River.

scholarly journals ANALISIS PERUBAHAN GARIS PANTAI UJUNG PANGKAH DENGAN MENGGUNAKAN METODE EDGE DETECTION DAN NORMALIZED DIFFERENCE WATER INDEX (UJUNG PANGKAH SHORELINE CHANGE ANALYSIS USING EDGE DETECTION METHOD AND NORMALIZED DIFFERENCE WATER INDEX)

2018 ◽  
Vol 14 (2) ◽  
Author(s):  
Nanin Anggraini ◽  
Sartono Marpaung ◽  
Maryani Hartuti
Keyword(s):  
Edge Detection ◽  
Detection Method ◽  
Shoreline Change ◽  
Landsat 8 ◽  
Landsat Data ◽  
Change Analysis ◽  
Water Index ◽  
Normalized Difference Water Index ◽  
Landsat 7 ◽  
Edge Detection Method

Besides to the effects from tidal, coastline position changed due to abrasion and accretion. Therefore, it is necessary to detect the position of coastline, one of them by utilizing Landsat data by using edge detection and NDWI filter. Edge detection is a mathematical method that aims to identify a point on a digital image based on the brightness level. Edge detection is used because it is very good to present the appearance of a very varied object on the image so it can be distinguished easily. NDWI is able to separate land and water clearly, making it easier for coastline analysis. This study aimed to detect coastline changes in Ujung Pangkah of Gresik Regency caused by accretion and abrasion using edge detection and NDWI filters on temporal Landsat data (2000 and 2015). The data used in this research was Landsat 7 in 2000 and Landsat 8 in 2015. The results showed that the coastline of Ujung Pangkah Gresik underwent many changes due to accretion and abrasion. The accretion area reached 11,35 km2 and abrasion 5,19 km2 within 15 year period. Abstrak Selain akibat adanya pasang surut, posisi garis pantai berubah akibat adanya abrasi dan akresi. Oleh karena itu diperlukan adanya deteksi posisi garis pantai, salah satunya dengan memanfaatkan data Landsat dengan menggunakan filter edge detection dan NDWI. Edge detection adalah suatu metode matematika yang bertujuan untuk mengidentifikasi suatu titik pada gambar digital berdasarkan tingkat kecerahan. Filter edge detection digunakan karena sangat baik untuk menyajikan penampakan obyek yang sangat bervariasi pada citra sehingga dapat dibedakan dengan mudah. NDWI mampu memisahkan antara daratan dan perairan dengan jelas sehingga memudahkan untuk analisis garis pantai. Penelitian ini bertujuan untuk deteksi perubahan garis pantai di Ujung Pangkah Kabupaten Gresik yang disebabkan oleh adanya akresi dan abrasi dengan menggunakan filter edge detection dan NDWI pada data Landsat temporal (tahun 2000 dan 2015). Data yang digunakan pada penelitian ini adalah citra Landsat 7 tahun 2000 dan Landsat 8 tahun 2015. Hasil penelitian menunjukkan bahwa garis pantai di Ujung Pangkah Gresik banyak mengalami perubahan akibat adanya akresi dan abrasi. Luas akresi mencapai 11,35 km2 dan abrasi 5,19 km2 dalam periode waktu 15 tahun.

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