Alan D. Ziegler's research while affiliated with Maejo University and other places

Publications (11)

Article
Full-text available
Background Urban agriculture is potentially an important piece of the food security puzzle for a rapidly growing urban world population. Community gardening is also promoted as a safe and viable form of exercise for aging populations in crowded settings where opportunities to participate in other action activities may be limited. Knowledge of poten...
Article
We investigated processes contributing to periodic acidification events in headwater streams of Nee Soon Forest Catchment (NSFC) in Singapore by monitoring hydrochemical changes in response to rainfall inputs. Stream chemistry response to most rainfall events was characterised by decreases in pH from means ranging from 5.1 to 5.3 to below 4.8 to 5....
Article
Full-text available
Southeast Asia contains about half of all tropical mountain forests, which are rich in biodiversity and carbon stocks, yet there is debate as to whether regional mountain forest cover has increased or decreased in recent decades. Here, our analysis of high-resolution satellite datasets reveals increasing mountain forest loss across Southeast Asia....
Article
Full-text available
During a university class project related to climate change mitigation strategies, we utilized a university green space as a “living laboratory” for collaborative learning exercise to estimate landscape-level carbon biomass storage. The key objective of the exercise was to foster sustainability awareness with regard to the effectiveness of tree-pla...
Article
Full-text available
This paper proposes a regionalization method for streamflow prediction in ungauged watersheds in the 7461 km² area above the Gharehsoo Hydrometry Station in the Ardabil Province, in the north of Iran. First, the Fuzzy c-means clustering method (FCM) was used to divide 46 gauged (19) and ungauged (27) watersheds into homogenous groups based on a var...
Article
Volatile rivers that involve floodplain stripping and subsequent floodplain reconstruction by vertical accretion are poorly known worldwide. This paper aims to partially fill this knowledge gap by a review of existing information and the provision of the currently most detailed account of such a river, namely the Ping River of northern Thailand. Re...
Article
The paper explore the idea that flood-related mortality from river over-bank flows in the SE Asian region could be reduced by incorporating evidence from the past to foster a better understanding of the realm of plausible flood regimes, and hopefully guide flood hazard management practices in the future.
Article
Full-text available
To improve management and conservation in ungauged catchments in northern Iran, we developed regional models to predict annual runoff and discharge using multi-year time series from 20 gauged catchments in Ardabil, Province. We employed correlation, Ward cluster analysis, and principal component analysis to reduce the total parameter set (69 parame...
Conference Paper
Full-text available
Understanding the movement of water in soils is important for estimating subsurface water reserves. Despite the advances made in understanding water movement, very few tools can directly 'follow the water'. Tritium, a tracer that decays with time and resides within individual water molecules, is one such tool. Some tritium is produced naturally, ot...
Article
Wood‐based mulches are a preferred erosion control material for rehabilitation of degraded lands because they can be made from native wood materials; however, research is needed to verify the effectiveness of new products prior to application. The present study aims to assess the effectiveness of two types of native wood strand mulches from Iran (w...
Article
Full-text available
In an effort to improve tools for effective flood risk assessment, we applied machine learning algorithms to predict flood-prone areas in Amol city (Iran), a site with recent floods (2017–2018). An ensemble approach was then implemented to predict hazard probabilities using the best machine learning algorithms (boosted regression tree, multivariate...

Citations

... Pollution by potentially toxic elements (PTEs) is becoming a serious and widespread issue in all environmental matrices because of accelerated population growth rate, rapid industrialization and urbanization, and other changes which have occurred in most parts of the world in the last few decades [1][2][3]. The increasingly worrying concern about the presence of PTEs in the environment has attracted considerable attention due to their potential impacts on ecosystem functioning and on public health because of their persistence and biotoxicity [4,5]. ...
... Due to the lack of BGB data, we estimated BGB at the plot level using the empirical allometric model, i.e. BGB = 0.489 × AGB 0.89 , of Mokany et al (2006), which has been widely used for BGB estimations for a wide range of tree species (Saatchi et al 2011, Tyukavina et al 2015, Feng et al 2021. Total forest carbon, calculated as the sum of AGB and BGB, was converted to total forest biomass carbon stocks using a conversion factor of 0.5 (Saatchi et al 2011, Zarin et al 2016. ...
... In this soft clustering approach, each data point is allocated a likelihood or probability score to determine if it belongs to that cluster, which gives comparatively better and robust results (Bezdek, 1981;Bora et al., 2014). Moreover, a broad spectrum of its applications in hydrology and geoscience field has been successfully conducted (Knoben et al., 2018;Mosavi et al., 2021;Sadri & Burn, 2011;Wu et al., 2020). A full explanation of fuzzy c-means cluster analysis algorithm can be found in Bezdek (1981). ...
... Interestingly, in all four rivers we observe clusters of pluvials, but the frequencies of these clusters appearing are different among the tributaries. Episodic floodplain stripping has been documented on the Ping River by a geomorphic and morphostratigraphic analysis by Wasson et al. (2021). These events were caused by extreme floods, or clusters of extreme floods, the last being a single flood in 1831, which was recorded in the Thai Royal Palace texts and caused a 60% crop loss in the country. ...
... These areas differ somewhat in the degree of human disturbance. Woodland areas are made of (replanted) secondary forests located in either nature reserves or urban parks (Gaw and Richards 2021;Ramchunder and Ziegler 2021). Some have been disturbed by old village settlements, military activity, road building, and other activities requiring forest clearance followed by subsequent reforestation. ...
... 2 consequences such as mortality [3,4]. The ill effect on human health is associated with limited capacity of health systems to cope with the rising demands of healthcare during flooding. ...
... Schaake et al. (1997) showed that many catchments are required to find a significant relationship between catchment model parameters and their physical characteristics. Recently, several authors developed a runoff and sediment yield model relating parameters to various geophysical, geospatial, hydrologic, and meteorological variables across different global basins (Restrepo et al., 2006;Syvitski & Milliman, 2007;Gyawali et al., 2015;Barbarossa et al., 2017;Golshan et al., 2020). ...
... Moreover, soil contributes to the growth and development of natural ecosystems, which directly benefit humankind [4][5][6]. Nowadays, much research is conducted to demonstrate the importance of soils, but forest areas affected by fire after human intervention need to be further investigated [7][8][9], especially in countries such as Iran. ...
... The flooded areas were randomly distributed across the study area and the data were split into 75% for model training and 25% for model testing. Environmental variables (Table 1) used in this study were selected based on preconceived knowledge and their relevance in the determination of flood risks as well as their wide-ranging applications in flood hazard mapping, as demonstrated in previous studies [38][39][40][41][42]. Prior to data assimilation into MaxEnt model, all the environmental factors were reprojected to World Geodetic System 84, Universal Transverse Mercator Zone 35 South (WGS_ 1984_UTM_Zone_35S) and resampled to 90 m × 90 m spatial resolution to ensure the same number of grid columns and rows. ...