A novel flood management strategy to plan eco-industry development in areas of coastal land-subsidence in Taiwan

2010 ◽  
Vol 37 (4) ◽  
pp. 553-561 ◽  
Author(s):  
Hui-Chen Su ◽  
Hau-I Lin
Keyword(s):  
Land Subsidence ◽  
Management Strategy ◽  
Ground Surface ◽  
Flood Management ◽  
Saline Soils ◽  
Salt Tolerant ◽  
Rural Regions ◽  
Novel Concept ◽  
Coastal Land ◽  
Wetland Habitats

Because of limited freshwater resources, urban and industrial areas in Taiwan are often given priority for allocation of water resources. Accordingly, residents in rural regions usually pump groundwater for irrigation and daily needs. Continuous land subsidence has resulted in the elevation of the ground surface to be lower than the sea level, which has led to frequent flooding and created wetland habitats. In addition, seawater intrusion has damaged the soil, which has made the land difficult to farm. This study proposes a novel concept called the Island Lake Eco-town Program that would send the surface runoff from stormwater into a flood buffer wetland through land elevation modification and the necessary levee construction. Except for the use of stormwater to leach salt from the soil, we propose growing salt tolerant crops. Yunlin County of Taiwan has been selected as a study area to evaluate the feasibility of the proposed method. This study also demonstrated how to evaluate the available production of rice growth in saline soils.

Deciphering Diversity of Salt-Tolerant Bacilli from Saline Soils of Eastern Indo-gangetic Plains of India

2014 ◽  
Vol 32 (2) ◽  
pp. 170-180 ◽  
Author(s):  
Anjney Sharma ◽  
Preeti Singh ◽  
Sudheer Kumar ◽  
Prem Lal Kashyap ◽  
Alok Kumar Srivastava ◽  
...  
Keyword(s):  
Saline Soils ◽  
Salt Tolerant ◽  
Gangetic Plains

Detecting land deformation due to groundwater changes with InSAR observations - the case of the island of Gotland, Sweden

2021 ◽  
Author(s):  
Mehdi Darvishi ◽  
Fernando Jaramillo
Keyword(s):  
Land Subsidence ◽  
Groundwater Level ◽  
Ground Deformation ◽  
Soil Depth ◽  
Ground Surface ◽  
Groundwater Depletion ◽  
Groundwater Levels ◽  
Small Baseline Subset ◽  
Small Baseline ◽  
The Baltic

<p>In the recent years, southern Sweden has experienced drought conditions during the summer with potential risks of groundwater shortages. One of the main physical effects of groundwater depletion is land subsidence, a geohazard that potentially damages urban infrastructure, natural resources and can generate casualties. We here investigate land subsidence induced by groundwater depletion and/or seasonal variations in Gotland, an agricultural island in the Baltic Sea experiencing recent hydrological droughts in the summer. Taking advantage of the multiple monitoring groundwater wells active on the island, we explore the existence of a relationship between groundwater fluctuations and ground deformation, as obtained from Interferometric Synthetic Aperture Radar (InSAR). The aim in the long-term is to develop a high-accuracy map of land subsidence with an appropriate temporal and spatial resolution to understand groundwater changes in the area are recognize hydroclimatic and anthropogenic drivers of change.</p><p>We processed Sentinel-1 (S1) data, covering the time span of 2016-2019, by using the Small BAseline Subset (SBAS) to process 119 S1-A/B data (descending mode). The groundwater level of Nineteen wells distributed over the Gotland island were used to assess the relationship between groundwater depletion and the detected InSAR displacement. In addition to that, the roles of other geological key factors such as soil depth, ground capacity in bed rock, karstification, structure of bedrock and soil type in occurring land subsidence also investigated. The findings showed that the groundwater level in thirteen wells with soil depths of less than 5 meters correlated well with InSAR displacements. The closeness of bedrock to ground surface (small soil depth) was responsible for high coherence values near the wells, and enabled the detection land subsidence. The results demonstrated that InSAR could use as an effective monitoring system for groundwater management and can assist in predicting or estimating low groundwater levels during summer conditions.</p>

scholarly journals The Effect of Suffusion Phenomenon in the Increasing of Land Subsidence Rate

2016 ◽  
Vol 2 (7) ◽  
pp. 316-323 ◽  
Author(s):  
Elmira Khaksar Najafi ◽  
Hadi Faghihmaleki
Keyword(s):  
Land Subsidence ◽  
Alluvial Soil ◽  
Ground Surface ◽  
Seepage Flow ◽  
Internal Erosion ◽  
Alluvial Soils ◽  
Sedimentary Deposits ◽  
Subsidence Rate ◽  
Internal Instability ◽  
Ground Surface Settlement

Land subsidence is defined as gradually ground surface settlement in an aquifer due to the compaction of unconsolidated sedimentary deposits. Since in an aquifer, deposits consist of cohesive or non-cohesive alluvial soil layers. The consolidation theory cannot be explained as the only reason for land subsidence. According to the susceptibility of alluvial soils to suffusion, internal erosion is also considerable to enhance the rate of the local settlement. Suffusion is explained as a process of soil particle movement in the soil body due to the effect of seepage flow on it. The subsidence rate in southwest and south of Tehran in Iran is very considerable whereby some structures have suffered significant damages due to this phenomenon. In this research, the contribution of suffusion and land subsidence was investigated in damaged building located at Ghale Morghi Street in southwest of Tehran, as a case history. Because of the incapability of available methods, in this article, a probability pattern is also proposed using statistical analysis for determination the likelihood of internal instability in alluvial soils in regard to soil cohesiveness.

scholarly journals Relative Salinity Tolerance of Turf-type Saltgrass Selections

HortScience ◽  
2007 ◽  
Vol 42 (2) ◽  
pp. 205-209 ◽  
Author(s):  
Y.L. Qian ◽  
J.M. Fu ◽  
S.J. Wilhelm ◽  
D. Christensen ◽  
A.J. Koski
Keyword(s):  
Salt Tolerance ◽  
Culture System ◽  
Hydroponic Culture ◽  
Distichlis Spicata ◽  
Saline Soils ◽  
Salt Tolerant ◽  
Saline Irrigation ◽  
Turf Quality ◽  
Salinity Levels ◽  
Irrigation Waters

Salt-tolerant turfgrass is highly desirable in areas associated with saline soils or saline irrigation waters. To determine the salt tolerance of 14 saltgrass [Distichlis spicata var. stricta (Greene)] selections, two greenhouse studies were conducted by means of a hydroponic culture system. Five salinity levels (from 2 to 48 dS·m−1) were created with ocean salts. In general, turf quality decreased and leaf firing increased as salinity increased. However, varying levels of salt tolerance were observed among selections based on leaf firing, turf quality, root growth, and clipping yield. Selections COAZ-01, COAZ-18, CO-01, and COAZ-19 exhibited the best turf quality and the least leaf firing at 36 and 48 dS·m−1 salinity levels in both Experiments 1 and 2. At the highest salinity level (48 dS·m−1), COAZ-18 and COAZ-19 exhibited the highest root activity among all accessions. Salinity levels that caused 25% clipping reduction ranged from 21.2 to 29.9 dS·m−1 and were not significantly different among entries. The data on 25% clipping reduction salinity of saltgrass generated in this study rank saltgrass as one of the most salt-tolerant species that can be used as turf.

scholarly journals Responses of Foreign GA3 Application on Seedling Growth of Castor Bean (Ricinus communis L.) under Salinity Stress Conditions

Agronomy ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 274
Author(s):  
Xiurong Jiao ◽  
Wenfang Zhi ◽  
Guijuan Liu ◽  
Guanglong Zhu ◽  
Gongneng Feng ◽  
...  
Keyword(s):  
Plant Height ◽  
Seedling Growth ◽  
Castor Bean ◽  
Ricinus Communis ◽  
Proline Content ◽  
Stem Diameter ◽  
Saline Soils ◽  
Salt Tolerant ◽  
Marginal Lands ◽  
Ricinus Communis L

Castor bean (Ricinus communis L.), a promising bioenergy crop, is readily planted in marginal lands like saline soils. A controlled experiment was conducted to explore the possibility of using gibberellic acid (GA3) as a promoter for caster bean grown under NaCl conditions and to try to determine the most appropriate concentration of GA3 for seedling growth. The seeds of salt-tolerant cultivar Zibi 5 were firstly soaked with 0, 200, 250, and 300 µM GA3 for 12 h and then cultured with 1/2 Hoagland solution containing 0, 50, and 100 mM NaCl in pots filled with sand. Plant height, stem diameter, leaf area, dry mater of each organ, activity of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT), soluble protein, and proline content in the leaves were examined. Plant height and stem diameter, SOD, and POD activity was significantly highest in the treatment of 250 µM GA3 under salt concentration of 50 mM NaCl among all the testing days; protein content was highest when GA3 concentration was 250 µM under 100 mM NaCl treatment. This indicated that caster bean seed soaking with 250 µM GA3 could be the most suitable concentration for promoting seedling growth of caster bean, improving their stress resistance.

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